{"id":73120,"date":"2026-02-07T05:57:25","date_gmt":"2026-02-06T21:57:25","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/73120.html"},"modified":"2026-02-07T05:57:25","modified_gmt":"2026-02-06T21:57:25","slug":"javascript%e5%86%85%e7%bd%ae%e6%95%b0%e6%8d%ae%e7%bb%93%e6%9e%84","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/73120.html","title":{"rendered":"JavaScript\u5185\u7f6e\u6570\u636e\u7ed3\u6784"},"content":{"rendered":"<\/p>\n<h4>JavaScript\u5185\u7f6e\u6570\u636e\u7ed3\u6784<\/h4>\n<ul>\n<li>\u524d\u8a00&#xff1a;\u4ece\u7b97\u6cd5\u9898\u8bf4\u8d77<\/li>\n<li>\n<ul>\n<li>\u89e3\u6cd51&#xff1a;\u4f7f\u7528Array\u65b9\u6cd5&#xff08;\u65f6\u95f4\u590d\u6742\u5ea6O(n\u00b2)&#xff09;<\/li>\n<li>\u89e3\u6cd52&#xff1a;\u4f7f\u7528Set&#xff08;\u65f6\u95f4\u590d\u6742\u5ea6O(n)&#xff09;<\/li>\n<li>\u89e3\u6cd53&#xff1a;\u4f7f\u7528Object&#xff08;\u65f6\u95f4\u590d\u6742\u5ea6O(n)&#xff09;<\/li>\n<\/ul>\n<\/li>\n<li>Map vs Object&#xff1a;\u952e\u503c\u5bf9\u7684\u73b0\u4ee3\u9009\u62e9<\/li>\n<li>\n<ul>\n<li>Map<\/li>\n<li>\n<ul>\n<li>Map\u7684\u57fa\u672c\u4f7f\u7528<\/li>\n<li>Map\u7684\u6838\u5fc3\u7279\u6027<\/li>\n<li>\n<ul>\n<li>1. \u5141\u8bb8\u4efb\u610f\u7c7b\u578b\u7684\u952e<\/li>\n<li>2. \u987a\u5e8f\u4fdd\u6301<\/li>\n<li>3. \u53ef\u4ee5\u76f4\u63a5\u83b7\u53d6\u5927\u5c0f<\/li>\n<li>4. \u9ad8\u6548\u7684\u67e5\u627e\u548c\u5220\u9664<\/li>\n<li>5. \u5141\u8bb8\u6279\u91cf\u6e05\u9664\u7b49\u64cd\u4f5c<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<li>Object<\/li>\n<li>\n<ul>\n<li>Object\u7684\u57fa\u672c\u4f7f\u7528<\/li>\n<li>\n<ul>\n<li>&#096;new&#096; \u5173\u952e\u5b57\u548c &#096;Object&#096; \u6784\u9020\u51fd\u6570<\/li>\n<li>\u5bf9\u8c61\u5b57\u9762\u91cf\u8868\u793a\u6cd5<\/li>\n<\/ul>\n<\/li>\n<li>Object\u7684\u6838\u5fc3\u7279\u6027<\/li>\n<li>\n<ul>\n<li>1. \u952e\u53ea\u80fd\u662f\u5b57\u7b26\u4e32\u6216Symbol<\/li>\n<li>2. \u987a\u5e8f\u95ee\u9898&#xff08;ES6\u540e\u5b57\u7b26\u4e32\u952e\u6309\u63d2\u5165\u987a\u5e8f&#xff0c;\u4f46\u4ecd\u6709\u7279\u6b8a\u60c5\u51b5&#xff09;<\/li>\n<li>3. \u5927\u5c0f\u9700\u8981\u624b\u52a8\u8ba1\u7b97<\/li>\n<li>4. \u7ee7\u627f\u7684\u5c5e\u6027\u548c\u65b9\u6cd5<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<li>\u4f55\u65f6\u9009\u62e9Map&#xff1f;\u4f55\u65f6\u9009\u62e9Object&#xff1f;<\/li>\n<li>\n<ul>\n<li>\u573a\u666f1&#xff1a;\u952e\u662f\u52a8\u6001\u7684&#xff0c;\u4e14\u7c7b\u578b\u591a\u6837\u7684&#xff1a;\u4f7f\u7528Map<\/li>\n<li>\u573a\u666f2&#xff1a;\u9700\u8981\u9891\u7e41\u589e\u5220\u952e\u503c\u5bf9&#xff1a;\u4f7f\u7528Map<\/li>\n<li>\u573a\u666f3&#xff1a;JSON\u6570\u636e\u3001\u914d\u7f6e\u5bf9\u8c61\u3001\u7eaf\u6570\u636e\u5b58\u50a8&#xff1a;\u4f7f\u7528Object<\/li>\n<li>\u573a\u666f4&#xff1a;\u9700\u8981\u539f\u578b\u7ee7\u627f\u3001\u65b9\u6cd5\u5171\u4eab&#xff1a;\u4f7f\u7528Object<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<li>Set vs Array&#xff1a;\u96c6\u5408\u64cd\u4f5c\u7684\u827a\u672f<\/li>\n<li>\n<ul>\n<li>Set<\/li>\n<li>\n<ul>\n<li>Set\u7684\u57fa\u672c\u4f7f\u7528<\/li>\n<li>Set\u7684\u6838\u5fc3\u7279\u6027<\/li>\n<li>\n<ul>\n<li>1. \u81ea\u52a8\u53bb\u91cd\u4e0e\u5927\u5c0f\u8ba1\u7b97<\/li>\n<li>2. \u652f\u6301\u4efb\u610f\u7c7b\u578b\u7684\u503c<\/li>\n<li>3. \u9ad8\u6548\u7684\u6210\u5458\u68c0\u67e5<\/li>\n<li>4. \u96c6\u5408\u8fd0\u7b97&#xff1a;\u5e76\u96c6 &amp; \u4ea4\u96c6 &amp; \u5dee\u96c6<\/li>\n<li>\u4e0eArray\u4e92\u8f6c<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<li>Array<\/li>\n<li>\n<ul>\n<li>Array\u7684\u57fa\u672c\u4f7f\u7528<\/li>\n<li>\n<ul>\n<li>&#096;new&#096; \u5173\u952e\u5b57\u548c &#096;Array&#096; \u6784\u9020\u51fd\u6570<\/li>\n<li>\u6570\u7ec4\u5b57\u9762\u91cf\u8868\u793a\u6cd5<\/li>\n<\/ul>\n<\/li>\n<li>Array\u7684\u6838\u5fc3\u7279\u6027<\/li>\n<li>\n<ul>\n<li>1. \u5141\u8bb8\u91cd\u590d\u548c\u76f4\u63a5\u8ba1\u7b97\u5927\u5c0f<\/li>\n<li>2. \u4e30\u5bcc\u7684\u6570\u7ec4\u65b9\u6cd5 &#8211; \u4f1a\u6539\u53d8\u539f\u6570\u7ec4<\/li>\n<li>\n<ul>\n<li>\u586b\u5145fill()\u65b9\u6cd5<\/li>\n<li>\u6808\u65b9\u6cd5 push() \u548c pop()<\/li>\n<li>\u961f\u5217\u65b9\u6cd5 shift() \u548c unshift()<\/li>\n<li>\u6392\u5e8f\u65b9\u6cd5 sort() \u548c reverse()<\/li>\n<li>\u5f3a\u5927\u7684splice()<\/li>\n<\/ul>\n<\/li>\n<li>3. \u4e30\u5bcc\u7684\u6570\u7ec4\u65b9\u6cd5 &#8211; \u4e0d\u4f1a\u6539\u53d8\u539f\u6570\u7ec4<\/li>\n<li>\n<ul>\n<li>\u6570\u7ec4\u8fde\u63a5\u65b9\u6cd5concat()<\/li>\n<li>\u6570\u7ec4\u622a\u53d6\u65b9\u6cd5slice()<\/li>\n<li>\u4e25\u683c\u76f8\u7b49\u67e5\u627eindexOf()\u3001lastIndexOf() \u548c includes()<\/li>\n<li>\u65ad\u8a00\u67e5\u627efind() \u548c findIndex()<\/li>\n<li>\u8fed\u4ee3\u65b9\u6cd5forEach()\u3001map()\u3001filter()\u3001every()\u3001some()<\/li>\n<li>\u5f52\u5e76\u65b9\u6cd5reduce()<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<li>\u4f55\u65f6\u9009\u62e9Set&#xff1f;\u4f55\u65f6\u9009\u62e9Array&#xff1f;<\/li>\n<li>\n<ul>\n<li>\u573a\u666f1&#xff1a;\u9700\u8981\u5feb\u901f\u6210\u5458\u68c0\u67e5&#xff1a;\u4f7f\u7528Set<\/li>\n<li>\u573a\u666f2&#xff1a;\u9700\u8981\u53bb\u91cd&#xff1a;\u4f7f\u7528Set<\/li>\n<li>\u573a\u666f3&#xff1a;\u6570\u5b66\u96c6\u5408\u8fd0\u7b97&#xff1a;\u4f7f\u7528Set<\/li>\n<li>\u573a\u666f4&#xff1a;\u6709\u5e8f\u6570\u636e\u3001\u9700\u8981\u7d22\u5f15\u8bbf\u95ee\u3001\u4e30\u5bcc\u6570\u7ec4\u64cd\u4f5c&#xff1a;\u4f7f\u7528Array<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<li>WeakMap\u4e0eWeakSet&#xff1a;\u5f31\u5f15\u7528\u7684\u827a\u672f<\/li>\n<li>\n<ul>\n<li>WeakMap&#xff1a;\u5f31\u5f15\u7528\u7684\u952e\u503c\u5bf9<\/li>\n<li>\n<ul>\n<li>WeakMap\u7684\u57fa\u672c\u7279\u6027<\/li>\n<li>\n<ul>\n<li>1. \u952e\u5fc5\u987b\u662f\u5bf9\u8c61&#xff08;\u4e0d\u80fd\u662f\u539f\u59cb\u503c&#xff09;<\/li>\n<li>2. \u4e0d\u80fd\u8ba1\u7b97\u5927\u5c0f<\/li>\n<li>3. \u952e\u662f\u5f31\u5f15\u7528&#xff08;\u4e0d\u4f1a\u963b\u6b62\u5783\u573e\u56de\u6536&#xff09;<\/li>\n<li>4. \u6ca1\u6709\u904d\u5386\u65b9\u6cd5&#xff08;\u4e0d\u80fd\u8fed\u4ee3&#xff09;<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<li>WeakSet&#xff1a;\u5f31\u5f15\u7528\u7684\u96c6\u5408<\/li>\n<li>\n<ul>\n<li>WeakSet\u7684\u57fa\u672c\u7279\u6027<\/li>\n<li>\n<ul>\n<li>1. \u503c\u5fc5\u987b\u662f\u5bf9\u8c61<\/li>\n<li>2. \u5f31\u5f15\u7528\u7279\u6027&#xff08;\u4e0d\u4f1a\u963b\u6b62\u5783\u573e\u56de\u6536&#xff09;<\/li>\n<li>3. \u6ca1\u6709\u904d\u5386\u65b9\u6cd5&#xff08;\u4e0d\u80fd\u8fed\u4ee3&#xff09;<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<li>\u7ed3\u8bed<\/li>\n<\/ul>\n<h2>\u524d\u8a00&#xff1a;\u4ece\u7b97\u6cd5\u9898\u8bf4\u8d77<\/h2>\n<p>\u627e\u51fa\u4e0b\u5217\u6570\u7ec4\u4e2d\u91cd\u590d\u7684\u5143\u7d20&#xff08;\u5047\u8bbe\u6240\u6709\u6570\u5b57\u6700\u591a\u53ea\u51fa\u73b02\u6b21&#xff09;&#xff1a;<\/p>\n<p><span class=\"token keyword\">const<\/span> arr <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">4<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">5<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h3>\u89e3\u6cd51&#xff1a;\u4f7f\u7528Array\u65b9\u6cd5&#xff08;\u65f6\u95f4\u590d\u6742\u5ea6O(n\u00b2)&#xff09;<\/h3>\n<p><span class=\"token keyword\">function<\/span> <span class=\"token function\">findDuplicatesWithArray<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">arr<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> arr<span class=\"token punctuation\">.<\/span><span class=\"token function\">filter<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">item<span class=\"token punctuation\">,<\/span> index<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&gt;<\/span> arr<span class=\"token punctuation\">.<\/span><span class=\"token function\">indexOf<\/span><span class=\"token punctuation\">(<\/span>item<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">!&#061;&#061;<\/span> index<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h3>\u89e3\u6cd52&#xff1a;\u4f7f\u7528Set&#xff08;\u65f6\u95f4\u590d\u6742\u5ea6O(n)&#xff09;<\/h3>\n<p><span class=\"token keyword\">function<\/span> <span class=\"token function\">findDuplicatesWithSet<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">arr<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">const<\/span> seen <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Set<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">const<\/span> duplicates <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Set<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">const<\/span> item <span class=\"token keyword\">of<\/span> arr<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>seen<span class=\"token punctuation\">.<\/span><span class=\"token function\">has<\/span><span class=\"token punctuation\">(<\/span>item<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            duplicates<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span>item<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            seen<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span>item<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> Array<span class=\"token punctuation\">.<\/span><span class=\"token function\">from<\/span><span class=\"token punctuation\">(<\/span>duplicates<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h3>\u89e3\u6cd53&#xff1a;\u4f7f\u7528Object&#xff08;\u65f6\u95f4\u590d\u6742\u5ea6O(n)&#xff09;<\/h3>\n<p><span class=\"token keyword\">function<\/span> <span class=\"token function\">findDuplicatesWithObject<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">arr<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">const<\/span> seen <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">const<\/span> duplicates <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">const<\/span> item <span class=\"token keyword\">of<\/span> arr<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>seen<span class=\"token punctuation\">[<\/span>item<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            duplicates<span class=\"token punctuation\">.<\/span><span class=\"token function\">push<\/span><span class=\"token punctuation\">(<\/span>item<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            seen<span class=\"token punctuation\">[<\/span>item<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token boolean\">true<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> duplicates<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u4e0a\u8ff0\u89e3\u6cd5\u90fd\u80fd\u89e3\u51b3\u8fd9\u4e00\u95ee\u9898&#xff0c;\u4f46\u968f\u7740\u6570\u636e\u91cf\u589e\u5927&#xff0c;\u8fd9\u4e9b\u65b9\u6848\u7684\u6027\u80fd\u5dee\u5f02\u4f1a\u975e\u5e38\u660e\u663e\u3002\u8981\u7406\u89e3\u4e3a\u4ec0\u4e48&#xff0c;\u6211\u4eec\u5c31\u9700\u8981\u6df1\u5165\u4e86\u89e3\u6bcf\u79cd\u6570\u636e\u7ed3\u6784\u7684\u7279\u70b9\u3002<\/p>\n<h2>Map vs Object&#xff1a;\u952e\u503c\u5bf9\u7684\u73b0\u4ee3\u9009\u62e9<\/h2>\n<h3>Map<\/h3>\n<h4>Map\u7684\u57fa\u672c\u4f7f\u7528<\/h4>\n<p>\u4f7f\u7528 new \u5173\u952e\u5b57\u548c Map \u6784\u9020\u51fd\u6570&#xff0c;\u53ef\u4ee5\u521b\u5efa\u4e00\u4e2a\u7a7a\u7684 Map \u6620\u5c04&#xff1a;<\/p>\n<p><span class=\"token keyword\">const<\/span> map <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Map<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u5f53\u7136&#xff0c;\u6211\u4eec\u4e5f\u53ef\u4ee5\u5728\u521b\u5efa\u7684\u65f6\u5019&#xff0c;\u540c\u65f6\u521d\u59cb\u5316\u5b9e\u4f8b&#xff0c;\u53ea\u9700\u8981\u7ed9Map \u6784\u9020\u51fd\u6570\u4f20\u5165\u4e00\u4e2a\u53ef\u8fed\u4ee3\u7684\u5bf9\u8c61\u5373\u53ef&#xff1a;<\/p>\n<p><span class=\"token keyword\">const<\/span> map <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Map<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">{<\/span><br \/>\n  <span class=\"token literal-property property\">a<\/span><span class=\"token operator\">:<\/span> <span class=\"token number\">1<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h4>Map\u7684\u6838\u5fc3\u7279\u6027<\/h4>\n<h5>1. \u5141\u8bb8\u4efb\u610f\u7c7b\u578b\u7684\u952e<\/h5>\n<p>map<span class=\"token punctuation\">.<\/span><span class=\"token function\">set<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;string&#039;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#039;\u5b57\u7b26\u4e32\u952e&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nmap<span class=\"token punctuation\">.<\/span><span class=\"token function\">set<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">123<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#039;\u6570\u5b57\u952e&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nmap<span class=\"token punctuation\">.<\/span><span class=\"token function\">set<\/span><span class=\"token punctuation\">(<\/span><span class=\"token boolean\">true<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#039;\u5e03\u5c14\u952e&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nmap<span class=\"token punctuation\">.<\/span><span class=\"token function\">set<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">{<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#039;\u5bf9\u8c61\u952e&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nmap<span class=\"token punctuation\">.<\/span><span class=\"token function\">set<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#039;\u6570\u7ec4\u952e&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nmap<span class=\"token punctuation\">.<\/span><span class=\"token function\">set<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&gt;<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#039;\u51fd\u6570\u952e&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nmap<span class=\"token punctuation\">.<\/span><span class=\"token function\">set<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">null<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#039;null\u952e&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nmap<span class=\"token punctuation\">.<\/span><span class=\"token function\">set<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">undefined<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#039;undefined\u952e&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h5>2. \u987a\u5e8f\u4fdd\u6301<\/h5>\n<p>map<span class=\"token punctuation\">.<\/span><span class=\"token function\">set<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;first&#039;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nmap<span class=\"token punctuation\">.<\/span><span class=\"token function\">set<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;second&#039;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nmap<span class=\"token punctuation\">.<\/span><span class=\"token function\">set<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;third&#039;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">const<\/span> <span class=\"token punctuation\">[<\/span>key<span class=\"token punctuation\">,<\/span> value<span class=\"token punctuation\">]<\/span> <span class=\"token keyword\">of<\/span> map<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    console<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span>key<span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#039;-&#039;<\/span><span class=\"token punctuation\">,<\/span> value<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u4fdd\u6301\u63d2\u5165\u987a\u5e8f<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h5>3. \u53ef\u4ee5\u76f4\u63a5\u83b7\u53d6\u5927\u5c0f<\/h5>\n<p>console<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;Map\u5927\u5c0f:&#039;<\/span><span class=\"token punctuation\">,<\/span> map<span class=\"token punctuation\">.<\/span>size<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h5>4. \u9ad8\u6548\u7684\u67e5\u627e\u548c\u5220\u9664<\/h5>\n<p>console<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;\u67e5\u627ekey\u4e3a123:&#039;<\/span><span class=\"token punctuation\">,<\/span> map<span class=\"token punctuation\">.<\/span><span class=\"token function\">has<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">123<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ true<\/span><br \/>\nconsole<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;\u83b7\u53d6key\u4e3a123\u7684\u503c:&#039;<\/span><span class=\"token punctuation\">,<\/span> map<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">123<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ &#039;\u6570\u5b57\u952e&#039;<\/span><\/p>\n<p>map<span class=\"token punctuation\">.<\/span><span class=\"token function\">delete<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">123<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nconsole<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;\u5220\u9664\u540e\u67e5\u627ekey\u4e3a123:&#039;<\/span><span class=\"token punctuation\">,<\/span> map<span class=\"token punctuation\">.<\/span><span class=\"token function\">has<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">123<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ false<\/span><\/p>\n<h5>5. \u5141\u8bb8\u6279\u91cf\u6e05\u9664\u7b49\u64cd\u4f5c<\/h5>\n<p>map<span class=\"token punctuation\">.<\/span><span class=\"token function\">clear<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nconsole<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;\u6e05\u7a7a\u540e\u7684\u5927\u5c0f:&#039;<\/span><span class=\"token punctuation\">,<\/span> map<span class=\"token punctuation\">.<\/span>size<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ 0<\/span><\/p>\n<h3>Object<\/h3>\n<h4>Object\u7684\u57fa\u672c\u4f7f\u7528<\/h4>\n<p>\u5728 JavaScript \u4e2d&#xff0c;\u663e\u5f0f\u5730\u521b\u5efa Object \u7684\u5b9e\u4f8b\u6709\u4e24\u79cd\u65b9\u5f0f&#xff1a;\u4e00\u79cd\u662f\u4f7f\u7528 new \u5173\u952e\u5b57\u548c Object \u6784\u9020\u51fd\u6570&#xff1b;\u53e6\u4e00\u79cd\u662f\u4f7f\u7528\u5bf9\u8c61\u5b57\u9762\u91cf\u8868\u793a\u6cd5\u3002<\/p>\n<h5>new \u5173\u952e\u5b57\u548c Object \u6784\u9020\u51fd\u6570<\/h5>\n<p><span class=\"token keyword\">const<\/span> obj <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Object<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h5>\u5bf9\u8c61\u5b57\u9762\u91cf\u8868\u793a\u6cd5<\/h5>\n<p><span class=\"token keyword\">const<\/span> obj <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h4>Object\u7684\u6838\u5fc3\u7279\u6027<\/h4>\n<h5>1. \u952e\u53ea\u80fd\u662f\u5b57\u7b26\u4e32\u6216Symbol<\/h5>\n<p>obj<span class=\"token punctuation\">.<\/span>string <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#039;\u5b57\u7b26\u4e32\u952e&#039;<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u952e\u4f1a\u88ab\u8f6c\u6362\u4e3a\u5b57\u7b26\u4e32<\/span><br \/>\nobj<span class=\"token punctuation\">[<\/span><span class=\"token number\">123<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#039;\u6570\u5b57\u952e&#039;<\/span><span class=\"token punctuation\">;<\/span>     <span class=\"token comment\">\/\/ \u6570\u5b57\u952e\u4f1a\u88ab\u8f6c\u6362\u4e3a\u5b57\u7b26\u4e32 &#039;123&#039;<\/span><br \/>\nobj<span class=\"token punctuation\">[<\/span><span class=\"token boolean\">true<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#039;\u5e03\u5c14\u952e&#039;<\/span><span class=\"token punctuation\">;<\/span>    <span class=\"token comment\">\/\/ \u5e03\u5c14\u952e\u4f1a\u88ab\u8f6c\u6362\u4e3a\u5b57\u7b26\u4e32 &#039;true&#039;<\/span><br \/>\nobj<span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">{<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#039;\u5bf9\u8c61\u952e&#039;<\/span><span class=\"token punctuation\">;<\/span>      <span class=\"token comment\">\/\/ \u5bf9\u8c61\u952e\u4f1a\u88ab\u8f6c\u6362\u4e3a\u5b57\u7b26\u4e32 &#039;[object Object]&#039;<\/span><br \/>\nobj<span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#039;\u6570\u7ec4\u952e&#039;<\/span><span class=\"token punctuation\">;<\/span>      <span class=\"token comment\">\/\/ \u6570\u7ec4\u952e\u4f1a\u88ab\u8f6c\u6362\u4e3a\u5b57\u7b26\u4e32 &#039;&#039;<\/span><br \/>\nobj<span class=\"token punctuation\">[<\/span><span class=\"token keyword\">null<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#039;null\u952e&#039;<\/span><span class=\"token punctuation\">;<\/span>    <span class=\"token comment\">\/\/ null\u952e\u4f1a\u88ab\u8f6c\u6362\u4e3a\u5b57\u7b26\u4e32 &#039;null&#039;<\/span><br \/>\nobj<span class=\"token punctuation\">[<\/span><span class=\"token keyword\">undefined<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#039;undefined\u952e&#039;<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ undefined\u952e\u4f1a\u88ab\u8f6c\u6362\u4e3a\u5b57\u7b26\u4e32 &#039;undefined&#039;<\/span><\/p>\n<h5>2. \u987a\u5e8f\u95ee\u9898&#xff08;ES6\u540e\u5b57\u7b26\u4e32\u952e\u6309\u63d2\u5165\u987a\u5e8f&#xff0c;\u4f46\u4ecd\u6709\u7279\u6b8a\u60c5\u51b5&#xff09;<\/h5>\n<p><span class=\"token keyword\">const<\/span> obj2 <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\nobj2<span class=\"token punctuation\">[<\/span><span class=\"token string\">&#039;2&#039;<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#039;two&#039;<\/span><span class=\"token punctuation\">;<\/span><br \/>\nobj2<span class=\"token punctuation\">[<\/span><span class=\"token string\">&#039;1&#039;<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#039;one&#039;<\/span><span class=\"token punctuation\">;<\/span><br \/>\nobj2<span class=\"token punctuation\">[<\/span><span class=\"token string\">&#039;10&#039;<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#039;ten&#039;<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>console<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;Object\u904d\u5386\u987a\u5e8f:&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">const<\/span> key <span class=\"token keyword\">in<\/span> obj2<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    console<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span>key<span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#039;-&#039;<\/span><span class=\"token punctuation\">,<\/span> obj2<span class=\"token punctuation\">[<\/span>key<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ 1 &#8211; one, 2 &#8211; two, 10 &#8211; ten<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u6570\u5b57\u5b57\u7b26\u4e32\u952e\u4f1a\u88ab\u6392\u5e8f&#xff01;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h5>3. \u5927\u5c0f\u9700\u8981\u624b\u52a8\u8ba1\u7b97<\/h5>\n<p>console<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;Object\u952e\u7684\u6570\u91cf:&#039;<\/span><span class=\"token punctuation\">,<\/span> Object<span class=\"token punctuation\">.<\/span><span class=\"token function\">keys<\/span><span class=\"token punctuation\">(<\/span>obj<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span>length<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h5>4. \u7ee7\u627f\u7684\u5c5e\u6027\u548c\u65b9\u6cd5<\/h5>\n<p>console<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;toString&#039;<\/span> <span class=\"token keyword\">in<\/span> obj<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ true&#xff08;\u6765\u81ea\u539f\u578b\u94fe&#xff09;<\/span><br \/>\nconsole<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span>obj<span class=\"token punctuation\">.<\/span><span class=\"token function\">hasOwnProperty<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;toString&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ false<\/span><\/p>\n<h3>\u4f55\u65f6\u9009\u62e9Map&#xff1f;\u4f55\u65f6\u9009\u62e9Object&#xff1f;<\/h3>\n<h4>\u573a\u666f1&#xff1a;\u952e\u662f\u52a8\u6001\u7684&#xff0c;\u4e14\u7c7b\u578b\u591a\u6837\u7684&#xff1a;\u4f7f\u7528Map<\/h4>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">DynamicKeyRegistry<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token function\">constructor<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>registry <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Map<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token function\">set<\/span><span class=\"token punctuation\">(<\/span>key<span class=\"token punctuation\">,<\/span> value<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>registry<span class=\"token punctuation\">.<\/span><span class=\"token function\">set<\/span><span class=\"token punctuation\">(<\/span>key<span class=\"token punctuation\">,<\/span> value<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span>key<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>registry<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span>key<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u53ef\u4ee5\u5b58\u50a8\u4efb\u4f55\u7c7b\u578b\u7684\u952e<\/span><br \/>\n    <span class=\"token function\">registerComponent<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">component<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>registry<span class=\"token punctuation\">.<\/span><span class=\"token function\">set<\/span><span class=\"token punctuation\">(<\/span>component<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token literal-property property\">mounted<\/span><span class=\"token operator\">:<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">,<\/span><br \/>\n            <span class=\"token literal-property property\">instances<\/span><span class=\"token operator\">:<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>\u573a\u666f2&#xff1a;\u9700\u8981\u9891\u7e41\u589e\u5220\u952e\u503c\u5bf9&#xff1a;\u4f7f\u7528Map<\/h4>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Cache<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token function\">constructor<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">capacity<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>capacity <span class=\"token operator\">&#061;<\/span> capacity<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>cache <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Map<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ Map\u4fdd\u6301\u63d2\u5165\u987a\u5e8f<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span>key<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span><span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>cache<span class=\"token punctuation\">.<\/span><span class=\"token function\">has<\/span><span class=\"token punctuation\">(<\/span>key<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>cache<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span>key<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token function\">set<\/span><span class=\"token punctuation\">(<\/span>key<span class=\"token punctuation\">,<\/span> value<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>cache<span class=\"token punctuation\">.<\/span><span class=\"token function\">has<\/span><span class=\"token punctuation\">(<\/span>key<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>cache<span class=\"token punctuation\">.<\/span><span class=\"token function\">delete<\/span><span class=\"token punctuation\">(<\/span>key<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>cache<span class=\"token punctuation\">.<\/span>size <span class=\"token operator\">&gt;&#061;<\/span> <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>capacity<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token comment\">\/\/ \u5220\u9664\u6700\u65e7\u7684&#xff08;Map\u7b2c\u4e00\u4e2a\u952e&#xff09;<\/span><br \/>\n            <span class=\"token keyword\">const<\/span> oldestKey <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>cache<span class=\"token punctuation\">.<\/span><span class=\"token function\">keys<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">next<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span>value<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>cache<span class=\"token punctuation\">.<\/span><span class=\"token function\">delete<\/span><span class=\"token punctuation\">(<\/span>oldestKey<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>cache<span class=\"token punctuation\">.<\/span><span class=\"token function\">set<\/span><span class=\"token punctuation\">(<\/span>key<span class=\"token punctuation\">,<\/span> value<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>\u573a\u666f3&#xff1a;JSON\u6570\u636e\u3001\u914d\u7f6e\u5bf9\u8c61\u3001\u7eaf\u6570\u636e\u5b58\u50a8&#xff1a;\u4f7f\u7528Object<\/h4>\n<p><span class=\"token keyword\">const<\/span> user <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token literal-property property\">name<\/span><span class=\"token operator\">:<\/span> <span class=\"token string\">&#039;\u5f20\u4e09&#039;<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token literal-property property\">age<\/span><span class=\"token operator\">:<\/span> <span class=\"token number\">30<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token literal-property property\">email<\/span><span class=\"token operator\">:<\/span> <span class=\"token string\">&#039;zhangsan&#064;example.com&#039;<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u53ef\u4ee5\u88abJSON.stringify\u76f4\u63a5\u5e8f\u5217\u5316<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u53ef\u4ee5\u88ab\u89e3\u6784\u8d4b\u503c<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u8bed\u6cd5\u66f4\u7b80\u6d01<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h4>\u573a\u666f4&#xff1a;\u9700\u8981\u539f\u578b\u7ee7\u627f\u3001\u65b9\u6cd5\u5171\u4eab&#xff1a;\u4f7f\u7528Object<\/h4>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Animal<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token function\">constructor<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">name<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>name <span class=\"token operator\">&#061;<\/span> name<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token function\">eat<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        console<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span><span class=\"token template-string\"><span class=\"token template-punctuation string\">&#096;<\/span><span class=\"token interpolation\"><span class=\"token interpolation-punctuation punctuation\">${<\/span><span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>name<span class=\"token interpolation-punctuation punctuation\">}<\/span><\/span><span class=\"token string\"> is eating<\/span><span class=\"token template-punctuation string\">&#096;<\/span><\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u7ee7\u627f\u548c\u539f\u578b\u94fe\u662fObject\u7684\u5f3a\u9879<\/span><br \/>\n<span class=\"token keyword\">const<\/span> dog <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Animal<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;Dog&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\ndog<span class=\"token punctuation\">.<\/span><span class=\"token function\">eat<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h2>Set vs Array&#xff1a;\u96c6\u5408\u64cd\u4f5c\u7684\u827a\u672f<\/h2>\n<h3>Set<\/h3>\n<h4>Set\u7684\u57fa\u672c\u4f7f\u7528<\/h4>\n<p>\u4f7f\u7528 new \u5173\u952e\u5b57\u548c Set \u6784\u9020\u51fd\u6570&#xff0c;\u53ef\u4ee5\u521b\u5efa\u4e00\u4e2a\u7a7a\u7684 Set \u96c6\u5408&#xff1a;<\/p>\n<p><span class=\"token keyword\">const<\/span> set <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Set<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u5f53\u7136&#xff0c;\u6211\u4eec\u4e5f\u53ef\u4ee5\u5728\u521b\u5efa\u7684\u65f6\u5019&#xff0c;\u540c\u65f6\u521d\u59cb\u5316\u5b9e\u4f8b&#xff0c;\u53ea\u9700\u8981\u7ed9 Set \u6784\u9020\u51fd\u6570\u4f20\u5165\u4e00\u4e2a\u53ef\u8fed\u4ee3\u7684\u5bf9\u8c61\u5373\u53ef&#xff1a;<\/p>\n<p><span class=\"token keyword\">const<\/span> set <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Set<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h4>Set\u7684\u6838\u5fc3\u7279\u6027<\/h4>\n<h5>1. \u81ea\u52a8\u53bb\u91cd\u4e0e\u5927\u5c0f\u8ba1\u7b97<\/h5>\n<p>set<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nset<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nset<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nset<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u91cd\u590d&#xff0c;\u4e0d\u4f1a\u6dfb\u52a0<\/span><br \/>\nset<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u91cd\u590d&#xff0c;\u4e0d\u4f1a\u6dfb\u52a0<\/span><\/p>\n<p>console<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;Set\u5185\u5bb9:&#039;<\/span><span class=\"token punctuation\">,<\/span> set<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ Set(3) {1, 2, 3}<\/span><br \/>\nconsole<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;Set\u5927\u5c0f:&#039;<\/span><span class=\"token punctuation\">,<\/span> set<span class=\"token punctuation\">.<\/span>size<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ 3<\/span><\/p>\n<h5>2. \u652f\u6301\u4efb\u610f\u7c7b\u578b\u7684\u503c<\/h5>\n<p>set<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;string&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nset<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">{<\/span> <span class=\"token literal-property property\">name<\/span><span class=\"token operator\">:<\/span> <span class=\"token string\">&#039;obj&#039;<\/span> <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nset<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nset<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">null<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nset<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">undefined<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nset<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">NaN<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nset<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">NaN<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ NaN\u5728Set\u4e2d\u4e5f\u88ab\u89c6\u4e3a\u76f8\u540c\u503c<\/span><\/p>\n<h5>3. \u9ad8\u6548\u7684\u6210\u5458\u68c0\u67e5<\/h5>\n<p>console<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;\u662f\u5426\u5305\u542b1:&#039;<\/span><span class=\"token punctuation\">,<\/span> set<span class=\"token punctuation\">.<\/span><span class=\"token function\">has<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ true<\/span><\/p>\n<h5>4. \u96c6\u5408\u8fd0\u7b97&#xff1a;\u5e76\u96c6 &amp; \u4ea4\u96c6 &amp; \u5dee\u96c6<\/h5>\n<p><span class=\"token keyword\">const<\/span> setA <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Set<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">4<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">const<\/span> setB <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Set<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">4<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">5<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">6<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u5e76\u96c6<\/span><br \/>\n<span class=\"token keyword\">const<\/span> union <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Set<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">[<\/span><span class=\"token operator\">&#8230;<\/span>setA<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&#8230;<\/span>setB<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nconsole<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;\u5e76\u96c6:&#039;<\/span><span class=\"token punctuation\">,<\/span> union<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ Set(6) {1, 2, 3, 4, 5, 6}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u4ea4\u96c6<\/span><br \/>\n<span class=\"token keyword\">const<\/span> intersection <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Set<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">[<\/span><span class=\"token operator\">&#8230;<\/span>setA<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">filter<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">x<\/span> <span class=\"token operator\">&#061;&gt;<\/span> setB<span class=\"token punctuation\">.<\/span><span class=\"token function\">has<\/span><span class=\"token punctuation\">(<\/span>x<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nconsole<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;\u4ea4\u96c6:&#039;<\/span><span class=\"token punctuation\">,<\/span> intersection<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ Set(2) {3, 4}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u5dee\u96c6&#xff08;A &#8211; B&#xff09;<\/span><br \/>\n<span class=\"token keyword\">const<\/span> difference <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Set<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">[<\/span><span class=\"token operator\">&#8230;<\/span>setA<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">filter<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">x<\/span> <span class=\"token operator\">&#061;&gt;<\/span> <span class=\"token operator\">!<\/span>setB<span class=\"token punctuation\">.<\/span><span class=\"token function\">has<\/span><span class=\"token punctuation\">(<\/span>x<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nconsole<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;\u5dee\u96c6(A-B):&#039;<\/span><span class=\"token punctuation\">,<\/span> difference<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ Set(2) {1, 2}<\/span><\/p>\n<h5>\u4e0eArray\u4e92\u8f6c<\/h5>\n<p><span class=\"token keyword\">const<\/span> set <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Set<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">4<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">const<\/span> arrFromSet <span class=\"token operator\">&#061;<\/span> Array<span class=\"token punctuation\">.<\/span><span class=\"token function\">from<\/span><span class=\"token punctuation\">(<\/span>set<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">const<\/span> setFromArr <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Set<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">4<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h3>Array<\/h3>\n<h4>Array\u7684\u57fa\u672c\u4f7f\u7528<\/h4>\n<p>\u5728 JavaScript \u4e2d&#xff0c;\u521b\u5efa Array \u7684\u5b9e\u4f8b\u6709\u4e24\u79cd\u65b9\u5f0f&#xff1a;\u4e00\u79cd\u662f\u4f7f\u7528 new \u5173\u952e\u5b57\u548c Array \u6784\u9020\u51fd\u6570&#xff1b;\u53e6\u4e00\u79cd\u662f\u4f7f\u7528\u6570\u7ec4\u5b57\u9762\u91cf\u8868\u793a\u6cd5\u3002<\/p>\n<h5>new \u5173\u952e\u5b57\u548c Array \u6784\u9020\u51fd\u6570<\/h5>\n<p>\u4f7f\u7528 new \u5173\u952e\u5b57\u548c Array \u6784\u9020\u51fd\u6570&#xff0c;\u53ef\u4ee5\u521b\u5efa\u4e00\u4e2a\u7a7a\u7684 Array \u6570\u7ec4&#xff1a;<\/p>\n<p><span class=\"token keyword\">const<\/span> arr <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Array<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u5f53\u7136&#xff0c;\u6211\u4eec\u4e5f\u53ef\u4ee5\u5728\u521b\u5efa\u7684\u65f6\u5019&#xff0c;\u540c\u65f6\u521d\u59cb\u5316\u5b9e\u4f8b&#xff0c;\u53ea\u9700\u8981\u7ed9 Set \u6784\u9020\u51fd\u6570\u4f20\u5165\u4e00\u4e2a\u53ef\u8fed\u4ee3\u7684\u5bf9\u8c61\u5373\u53ef&#xff1a;<\/p>\n<p><span class=\"token keyword\">const<\/span> arr <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Array<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">10<\/span> <span class=\"token punctuation\">,<\/span> <span class=\"token number\">20<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">30<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u503c\u5f97\u6ce8\u610f\u7684\u662f&#xff1a;\u5f53\u6211\u4eec\u4f7f\u7528 new Array(10 , 20, 30); \u8fd9\u79cd\u65b9\u5f0f\u521b\u5efa\u6570\u7ec4\u65f6&#xff0c;\u6570\u7ec4\u503c\u4e3a [10,20,30] &#xff1b;\u4f46\u5f53\u53c2\u6570\u53ea\u6709\u4e00\u4e2a\u65f6&#xff1a; new Array(10); \u8fd9\u65f6\u5019\u4f1a\u521b\u5efa\u4e00\u4e2a\u957f\u5ea6\u4e3a10\u7684\u6570\u7ec4\u3002<\/p>\n<h5>\u6570\u7ec4\u5b57\u9762\u91cf\u8868\u793a\u6cd5<\/h5>\n<p><span class=\"token keyword\">const<\/span> arr <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h4>Array\u7684\u6838\u5fc3\u7279\u6027<\/h4>\n<h5>1. \u5141\u8bb8\u91cd\u590d\u548c\u76f4\u63a5\u8ba1\u7b97\u5927\u5c0f<\/h5>\n<p>arr<span class=\"token punctuation\">.<\/span><span class=\"token function\">push<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\narr<span class=\"token punctuation\">.<\/span><span class=\"token function\">push<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\narr<span class=\"token punctuation\">.<\/span><span class=\"token function\">push<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\narr<span class=\"token punctuation\">.<\/span><span class=\"token function\">push<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u5141\u8bb8\u91cd\u590d<\/span><br \/>\narr<span class=\"token punctuation\">.<\/span><span class=\"token function\">push<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u5141\u8bb8\u91cd\u590d<\/span><\/p>\n<p>console<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;Array\u5185\u5bb9:&#039;<\/span><span class=\"token punctuation\">,<\/span> arr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ [1, 2, 3, 1, 2]<\/span><br \/>\nconsole<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;Array\u957f\u5ea6:&#039;<\/span><span class=\"token punctuation\">,<\/span> arr<span class=\"token punctuation\">.<\/span>length<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ 5<\/span><\/p>\n<h5>2. \u4e30\u5bcc\u7684\u6570\u7ec4\u65b9\u6cd5 &#8211; \u4f1a\u6539\u53d8\u539f\u6570\u7ec4<\/h5>\n<h6>\u586b\u5145fill()\u65b9\u6cd5<\/h6>\n<p><span class=\"token keyword\">const<\/span> arr <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Array<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">5<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\narr<span class=\"token punctuation\">.<\/span><span class=\"token function\">fill<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">5<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ [5, 5, 5, 5, 5]<\/span><\/p>\n<h6>\u6808\u65b9\u6cd5 push() \u548c pop()<\/h6>\n<ul>\n<li>push() \u65b9\u6cd5\u7528\u4e8e\u6570\u7ec4\u6a21\u62df\u5728\u6808\u9876\u7684\u5165\u6808\u64cd\u4f5c&#xff0c;\u5b83\u63a5\u6536\u4efb\u610f\u6570\u91cf\u7684\u53c2\u6570&#xff0c;\u5e76\u5c06\u5b83\u4eec\u6dfb\u52a0\u5230\u6570\u7ec4\u672b\u5c3e\u3002<\/li>\n<li>pop() \u65b9\u6cd5\u7528\u4e8e\u6570\u7ec4\u6a21\u62df\u5728\u6808\u9876\u7684\u51fa\u6808\u64cd\u4f5c&#xff0c;\u5b83\u4e0d\u63a5\u6536\u4efb\u4f55\u53c2\u6570&#xff0c;\u7528\u4e8e\u5220\u9664\u6570\u7ec4\u7684\u6700\u540e\u4e00\u9879\u3002<\/li>\n<\/ul>\n<p><span class=\"token keyword\">const<\/span> arr <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">4<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">5<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\narr<span class=\"token punctuation\">.<\/span><span class=\"token function\">push<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">6<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">7<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ [1, 2, 3, 4, 5, 6, 7]<\/span><br \/>\narr<span class=\"token punctuation\">.<\/span><span class=\"token function\">pop<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ [1, 2, 3, 4, 5, 6]<\/span><\/p>\n<h6>\u961f\u5217\u65b9\u6cd5 shift() \u548c unshift()<\/h6>\n<ul>\n<li>shift() \u65b9\u6cd5\u7528\u4e8e\u6570\u7ec4\u6a21\u5f0f\u5728\u961f\u5217\u5934\u90e8\u51fa\u961f\u64cd\u4f5c&#xff0c;\u5b83\u4e0d\u63a5\u6536\u4efb\u4f55\u53c2\u6570&#xff0c;\u7528\u4e8e\u5220\u9664\u6570\u7ec4\u7684\u7b2c\u4e00\u9879\u3002<\/li>\n<li>unshift() \u65b9\u6cd5\u7528\u4e8e\u6570\u7ec4\u6a21\u62df\u5728\u961f\u5217\u5934\u90e8\u7684\u5165\u961f\u64cd\u4f5c&#xff0c;\u5b83\u63a5\u6536\u4efb\u610f\u6570\u91cf\u7684\u53c2\u6570&#xff0c;\u5e76\u5c06\u5b83\u4eec\u6dfb\u52a0\u5230\u6570\u7ec4\u5934\u90e8\u3002<\/li>\n<\/ul>\n<p><span class=\"token keyword\">const<\/span> arr <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">4<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">5<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\narr<span class=\"token punctuation\">.<\/span><span class=\"token function\">unshift<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">6<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">7<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ [6, 7, 1, 2, 3, 4, 5]<\/span><br \/>\narr<span class=\"token punctuation\">.<\/span><span class=\"token function\">shift<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ [7, 1, 2, 3, 4, 5]<\/span><\/p>\n<h6>\u6392\u5e8f\u65b9\u6cd5 sort() \u548c reverse()<\/h6>\n<ul>\n<li>sort() \u65b9\u6cd5\u7528\u4e8e\u5bf9\u6570\u7ec4\u8fdb\u884c\u5347\u5e8f\u6392\u5e8f<\/li>\n<li>reverse() \u65b9\u6cd5\u7528\u4e8e\u5bf9\u6570\u7ec4\u8fdb\u884c\u964d\u5e8f\u6392\u5e8f<\/li>\n<\/ul>\n<h6>\u5f3a\u5927\u7684splice()<\/h6>\n<p>splice() \u65b9\u6cd5\u5e94\u8be5\u5c5e\u4e8e\u6570\u7ec4\u4e2d\u6700\u5f3a\u5927\u7684\u65b9\u6cd5\u4e86&#xff0c;\u53ef\u4ee5\u63a5\u53d7 2 \u4e2a\u53ca 2 \u4e2a\u4ee5\u4e0a\u7684\u53c2\u6570&#xff0c;\u901a\u5e38\u60c5\u51b5\u4e0b&#xff0c;\u7b2c 1 \u4e2a\u53c2\u6570\u8868\u793a\u8981\u8fdb\u884c\u64cd\u4f5c\u7684\u5f00\u59cb\u4f4d\u7f6e&#xff0c;\u7b2c 2 \u4e2a\u53c2\u6570\u8868\u793a\u8981\u5220\u9664\u7684\u5143\u7d20\u6570\u91cf&#xff0c;\u7b2c 3 \u4e2a\u53ca\u4ee5\u540e\u5f97\u6240\u6709\u53c2\u6570&#xff0c;\u90fd\u8868\u793a\u4e3a\u8981\u65b0\u63d2\u5165\u7684\u5143\u7d20\u3002\u56e0\u6b64&#xff0c;\u8be5\u65b9\u6cd5\u53ef\u4ee5\u6839\u636e\u53c2\u6570\u7684\u4e0d\u540c&#xff0c;\u53ef\u4ee5\u5b9e\u73b0\u5220\u9664\u3001\u63d2\u5165\u3001\u66ff\u6362\u7b49\u64cd\u4f5c&#xff1a;<\/p>\n<li>\u5220\u9664&#xff1a;\u9700\u8981\u4f20\u9012 2 \u4e2a\u53c2\u6570&#xff0c;\u6bd4\u5982&#xff1a;arr.splice(0, 2) \u4f1a\u5220\u9664\u524d2\u4e2a\u5143\u7d20\u3002<\/li>\n<li>\u63d2\u5165&#xff1a;\u9700\u8981\u4f20\u9012 3 \u4e2a\u6216 3 \u4e2a\u4ee5\u4e0a\u7684\u53c2\u6570&#xff0c;\u4e14\u7b2c\u4e8c\u4e2a\u53c2\u6570\u4e00\u5b9a\u4e3a 0&#xff0c;\u6bd4\u5982&#xff1a;arr.splice(2, 0, 1, 2, 3) \u4f1a\u4ece\u7b2c\u4e8c\u4e2a\u4f4d\u7f6e\u5f00\u59cb&#xff0c;\u5f80\u540e\u63d2\u5165 1, 2, 3 \u4e09\u4e2a\u5143\u7d20\u3002<\/li>\n<li>\u66ff\u6362&#xff1a;\u540c\u6837\u9700\u8981\u4f20\u9012 3 \u4e2a\u6216 3 \u4e2a\u4ee5\u4e0a\u7684\u53c2\u6570&#xff0c;\u8868\u793a\u4e3a\u4ece\u5f00\u59cb\u4f4d\u7f6e&#xff0c;\u5220\u9664\u591a\u5c11\u4e2a\u5143\u7d20\u540e&#xff0c;\u518d\u63d2\u5165\u5143\u7d20\u6570\u636e\u3002<\/li>\n<p><span class=\"token keyword\">const<\/span> arr <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">4<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">5<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\narr<span class=\"token punctuation\">.<\/span><span class=\"token function\">splice<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u4ece\u7d22\u5f151\u5f00\u59cb\u5220\u96642\u4e2a\u5143\u7d20(2&#xff0c; 3)&#xff0c;\u7ed3\u679c\u4e3a&#xff1a;[1, 4, 5]<\/span><br \/>\narr<span class=\"token punctuation\">.<\/span><span class=\"token function\">splice<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#039;a&#039;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#039;b&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u4ece\u7d22\u5f152\u5f00\u59cb\u63d2\u5165&#039;a&#039;\u548c&#039;b&#039;&#xff0c;\u7ed3\u679c\u4e3a&#xff1a;[1, 4, &#039;a&#039;, &#039;b&#039;, 5]<\/span><br \/>\narr<span class=\"token punctuation\">.<\/span><span class=\"token function\">splice<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#039;c&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u4ece\u7d22\u5f151\u5f00\u59cb\u5220\u96642\u4e2a\u5143\u7d20(4, &#039;a&#039;)&#xff0c;\u518d\u63d2\u5165&#039;c&#039;&#xff0c;[1, &#039;c&#039;, &#039;b&#039;, 5]<\/span><\/p>\n<p>\u6ce8&#xff1a;\u4ee5\u4e0a\u6240\u6709\u65b9\u6cd5\u5747\u4f1a\u6539\u53d8\u539f\u6570\u7ec4\u3002<\/p>\n<h5>3. \u4e30\u5bcc\u7684\u6570\u7ec4\u65b9\u6cd5 &#8211; \u4e0d\u4f1a\u6539\u53d8\u539f\u6570\u7ec4<\/h5>\n<h6>\u6570\u7ec4\u8fde\u63a5\u65b9\u6cd5concat()<\/h6>\n<p>concat() \u65b9\u6cd5\u7528\u4e8e\u5c06\u4e24\u4e2a\u6216\u591a\u4e2a\u6570\u7ec4\u76f8\u8fde\u63a5&#xff0c;\u8fd4\u56de\u4e00\u4e2a\u65b0\u7684\u6570\u7ec4&#xff1a;<\/p>\n<p><span class=\"token keyword\">const<\/span> arr1 <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">const<\/span> arr2 <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token number\">4<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">5<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">const<\/span> arr3 <span class=\"token operator\">&#061;<\/span> arr1<span class=\"token punctuation\">.<\/span><span class=\"token function\">concat<\/span><span class=\"token punctuation\">(<\/span>arr2<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/[1, 2, 3, 4, 5]<\/span><\/p>\n<h6>\u6570\u7ec4\u622a\u53d6\u65b9\u6cd5slice()<\/h6>\n<p>slice() \u65b9\u6cd5\u53ef\u4ee5\u63a5\u65361\u4e2a\u62162\u4e2a\u53c2\u6570&#xff1a;\u5f53\u53c2\u6570\u53ea\u67091\u4e2a\u65f6&#xff0c;slice() \u65b9\u6cd5\u4f1a\u8fd4\u56de\u4ece\u8be5\u7d22\u5f15\u5230\u6570\u7ec4\u672b\u5c3e\u7684\u6240\u6709\u5143\u7d20&#xff1b;\u5f53\u53c2\u6570\u67092\u4e2a\u65f6&#xff0c;slice() \u65b9\u6cd5\u4f1a\u8fd4\u56de\u4ece\u5f00\u59cb\u7d22\u5f15&#xff08;\u7b2c1\u4e2a\u53c2\u6570&#xff09;\u5230\u7ed3\u675f\u7d22\u5f15&#xff08;\u7b2c2\u4e2a\u53c2\u6570&#xff09;\u4e4b\u95f4\u7684\u6240\u6709\u5143\u7d20&#xff08;\u4e0d\u5305\u62ec\u7ed3\u675f\u7d22\u5f15\u7684\u503c&#xff09;&#xff1a;<\/p>\n<p><span class=\"token keyword\">const<\/span> arr <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">4<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">5<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\nconsole<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span>arr<span class=\"token punctuation\">.<\/span><span class=\"token function\">slice<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ [4, 5]<\/span><br \/>\nconsole<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span>arr<span class=\"token punctuation\">.<\/span><span class=\"token function\">slice<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ [0, 1]<\/span><\/p>\n<h6>\u4e25\u683c\u76f8\u7b49\u67e5\u627eindexOf()\u3001lastIndexOf() \u548c includes()<\/h6>\n<p>\u8fd9\u4e09\u4e2a\u65b9\u6cd5\u90fd\u662f\u7528\u4e8e\u5728\u6570\u7ec4\u4e2d\u67e5\u627e\u5143\u7d20\u7684\u65b9\u6cd5&#xff0c;\u5b83\u4eec\u90fd\u53ef\u4ee5\u63a5\u6536 1 \u4e2a\u6216 2 \u4e2a\u53c2\u6570&#xff1a;\u7b2c 1 \u4e2a\u53c2\u6570\u8868\u793a\u8981\u67e5\u627e\u7684\u5143\u7d20&#xff1b;\u7b2c 2 \u4e2a\u53c2\u6570\u53ef\u9009&#xff0c;\u8868\u793a\u8981\u4ece\u54ea\u4e2a\u4f4d\u7f6e\u5f00\u59cb\u627e&#xff08;\u4e0d\u586b\u9ed8\u8ba4\u4ece\u4f4d\u7f6e 0 &#xff0c;\u5373\u5168\u6570\u7ec4\u67e5\u627e&#xff09;\u3002<\/p>\n<ul>\n<li>indexOf() \u548c includes() \u90fd\u662f\u4ece\u6570\u7ec4\u5f00\u5934\u8fdb\u884c\u67e5\u627e&#xff0c;\u800c lastIndexOf() \u662f\u4ece\u6570\u7ec4\u672b\u5c3e\u5f00\u59cb\u67e5\u627e\u3002<\/li>\n<li>indexOf() \u548c lastIndexOf() \u4f1a\u8fd4\u56de\u8981\u67e5\u627e\u7684\u5143\u7d20\u5728\u6570\u7ec4\u4e2d\u5357\u7684\u7d22\u5f15\u4f4d\u7f6e&#xff0c;\u4e0d\u5b58\u5728\u8be5\u5143\u7d20\u5219\u8fd4\u56de -1 &#xff1b;includes() \u5219\u662f\u8fd4\u56de\u5e03\u5c14\u503c&#xff0c;\u8868\u793a\u662f\u5426\u627e\u5230\u5339\u914d\u9879\u3002<\/li>\n<\/ul>\n<p><span class=\"token keyword\">const<\/span> arr <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">4<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">5<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\narr<span class=\"token punctuation\">.<\/span><span class=\"token function\">indexOf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ 0<\/span><br \/>\narr<span class=\"token punctuation\">.<\/span><span class=\"token function\">lastIndexOf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ 5<\/span><br \/>\narr<span class=\"token punctuation\">.<\/span><span class=\"token function\">includes<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ true<\/span><\/p>\n<p>arr<span class=\"token punctuation\">.<\/span><span class=\"token function\">indexOf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">6<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ -1<\/span><br \/>\narr<span class=\"token punctuation\">.<\/span><span class=\"token function\">lastIndexOf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">6<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ -1<\/span><br \/>\narr<span class=\"token punctuation\">.<\/span><span class=\"token function\">includes<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">6<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ false<\/span><\/p>\n<p>\u6ce8&#xff1a;\u4ee5\u4e0a\u4e09\u4e2a\u65b9\u6cd5&#xff0c;\u5728\u8fdb\u884c\u6570\u7ec4\u5339\u914d\u67e5\u627e\u65f6&#xff0c;\u4f1a\u4f7f\u7528\u5168\u7b49&#xff08;&#061;&#061;&#061;&#xff09;\u8fdb\u884c\u6bd4\u8f83&#xff0c;\u4e5f\u5c31\u662f\u4e24\u9879\u5fc5\u987b\u4e25\u683c\u76f8\u7b49&#xff0c;\u56e0\u6b64\u4e00\u822c\u7528\u4e8e\u7b80\u5355\u57fa\u672c\u6570\u636e\u7c7b\u578b\u7684\u6570\u7ec4\u67e5\u627e&#xff1b;\u5bf9\u8c61\u6570\u7ec4\u901a\u8fc7\u4ee5\u4e0a\u65b9\u6cd5\u65e0\u6cd5\u67e5\u627e&#xff08;\u56e0\u4e3a\u5b83\u4eec\u5728\u67e5\u627e\u6bd4\u5bf9\u65f6&#xff0c;\u5bf9\u6bd4\u7684\u662f\u5f15\u7528\u5730\u5740&#xff09;\u3002<\/p>\n<h6>\u65ad\u8a00\u67e5\u627efind() \u548c findIndex()<\/h6>\n<ul>\n<li>find()&#xff1a;\u67e5\u627e\u5e76\u8fd4\u56de\u6570\u7ec4\u4e2d\u7b2c\u4e00\u4e2a\u6ee1\u8db3\u6761\u4ef6\u7684\u5143\u7d20\u503c&#xff0c;\u5982\u679c\u627e\u4e0d\u5230\u5219\u8fd4\u56de undefined\u3002<\/li>\n<li>findIndex()&#xff1a;\u67e5\u627e\u5e76\u8fd4\u56de\u6570\u7ec4\u4e2d\u7b2c\u4e00\u4e2a\u6ee1\u8db3\u6761\u4ef6\u7684\u5143\u7d20\u503c\u7684\u7d22\u5f15\u5730\u5740&#xff0c;\u5982\u679c\u627e\u4e0d\u5230\u5219\u8fd4\u56de -1 \u3002<\/li>\n<\/ul>\n<p><span class=\"token keyword\">const<\/span> arr <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n      <span class=\"token literal-property property\">name<\/span><span class=\"token operator\">:<\/span> <span class=\"token string\">&#039;zhangsan&#039;<\/span><span class=\"token punctuation\">,<\/span><br \/>\n      <span class=\"token literal-property property\">age<\/span><span class=\"token operator\">:<\/span> <span class=\"token number\">18<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n      <span class=\"token literal-property property\">name<\/span><span class=\"token operator\">:<\/span> <span class=\"token string\">&#039;lisi&#039;<\/span><span class=\"token punctuation\">,<\/span><br \/>\n      <span class=\"token literal-property property\">age<\/span><span class=\"token operator\">:<\/span> <span class=\"token number\">20<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>arr<span class=\"token punctuation\">.<\/span><span class=\"token function\">find<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">item<\/span> <span class=\"token operator\">&#061;&gt;<\/span> item<span class=\"token punctuation\">.<\/span>age <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">18<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ { name: &#039;lisi&#039;, age: 20 }<\/span><br \/>\narr<span class=\"token punctuation\">.<\/span><span class=\"token function\">findIndex<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">item<\/span> <span class=\"token operator\">&#061;&gt;<\/span> item<span class=\"token punctuation\">.<\/span>age <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">18<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ 1<\/span><\/p>\n<h6>\u8fed\u4ee3\u65b9\u6cd5forEach()\u3001map()\u3001filter()\u3001every()\u3001some()<\/h6>\n<p>JavaScript \u4e2d&#xff0c;\u4e3a\u6570\u7ec4\u5b9a\u4e49\u4e86 5 \u4e2a\u8fed\u4ee3\u65b9\u6cd5&#xff1a;<\/p>\n<ul>\n<li>forEach()&#xff1a;\u4f9d\u6b21\u904d\u5386\u6570\u7ec4\u4e2d\u7684\u6bcf\u4e00\u4e2a\u5143\u7d20&#xff0c;\u6ca1\u6709\u8fd4\u56de\u503c\u3002<\/li>\n<li>map()&#xff1a;\u5c06\u6570\u7ec4\u7684\u6bcf\u4e2a\u5143\u7d20\u6309\u7167\u4e00\u5b9a\u89c4\u5219\u8f6c\u6362\u6210\u65b0\u5143\u7d20&#xff0c;\u8fd4\u56de\u4e00\u4e2a\u65b0\u6570\u7ec4\u3002<\/li>\n<li>filter()&#xff1a;\u6309\u4e00\u5b9a\u89c4\u5219\u8fc7\u6ee4\u6570\u7ec4\u4e2d\u7684\u6240\u6709\u5143\u7d20&#xff0c;\u8fd4\u56de\u6ee1\u8db3\u89c4\u5219\u7684\u5143\u7d20\u3002<\/li>\n<li>every()&#xff1a;\u5bf9\u6570\u7ec4\u4e2d\u7684\u6bcf\u4e00\u4e2a\u5143\u7d20\u90fd\u8fdb\u884c\u51fd\u6570\u5904\u7406\u5224\u65ad&#xff0c;\u5982\u679c\u6570\u7ec4\u4e2d\u6bcf\u4e00\u4e2a\u5143\u7d20\u7684\u5224\u65ad\u503c\u90fd\u4e3a true&#xff0c;\u5219\u8fd9\u4e2a\u65b9\u6cd5\u7684\u8fd4\u56de\u7ed3\u679c\u662f true&#xff1b;\u5426\u5219\u8fd4\u56de false\u3002<\/li>\n<li>some()&#xff1a;\u5bf9\u6570\u7ec4\u4e2d\u7684\u6bcf\u4e00\u4e2a\u5143\u7d20\u90fd\u8fdb\u884c\u51fd\u6570\u5904\u7406\u5224\u65ad&#xff0c;\u53ea\u8981\u6570\u7ec4\u4e2d\u6709\u4e00\u4e2a\u5143\u7d20\u7684\u5224\u65ad\u503c\u4e3a true&#xff0c;\u5219\u8fd9\u4e2a\u65b9\u6cd5\u7684\u8fd4\u56de\u7ed3\u679c\u662f true&#xff1b;\u5426\u5219\u8fd4\u56de false\u3002<\/li>\n<\/ul>\n<p><span class=\"token keyword\">const<\/span> arr <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">4<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">5<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">const<\/span> mapRes <span class=\"token operator\">&#061;<\/span> arr<span class=\"token punctuation\">.<\/span><span class=\"token function\">map<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">num<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&gt;<\/span> num <span class=\"token operator\">*<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ [2, 4, 6, 8, 10]<\/span><br \/>\n<span class=\"token keyword\">const<\/span> filtered <span class=\"token operator\">&#061;<\/span> arr<span class=\"token punctuation\">.<\/span><span class=\"token function\">filter<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">num<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&gt;<\/span> num <span class=\"token operator\">%<\/span> <span class=\"token number\">2<\/span> <span class=\"token operator\">&#061;&#061;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ [2, 4]<\/span><br \/>\n<span class=\"token keyword\">const<\/span> everyRes <span class=\"token operator\">&#061;<\/span> arr<span class=\"token punctuation\">.<\/span><span class=\"token function\">every<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">num<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&gt;<\/span> num <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ true<\/span><br \/>\n<span class=\"token keyword\">const<\/span> someRes <span class=\"token operator\">&#061;<\/span> arr<span class=\"token punctuation\">.<\/span><span class=\"token function\">some<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">num<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&gt;<\/span> num <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">4<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ true<\/span><\/p>\n<p>\u6ce8&#xff1a;\u4ee5\u4e0a\u65b9\u6cd5\u672c\u8d28\u662f\u4e0d\u4f1a\u66f4\u6539\u539f\u6570\u7ec4\u4e2d&#xff0c;\u4f46\u5982\u679c\u5728\u65b9\u6cd5\u4f53\u5185\u90e8\u5bf9\u539f\u6570\u7ec4\u8fdb\u884c\u4e86\u66f4\u6539&#xff0c;\u4e5f\u662f\u4f1a\u5bf9\u539f\u6570\u7ec4\u4ea7\u751f\u5f71\u54cd\u7684&#xff0c;\u770b\u4e0b\u9762\u4e00\u6bb5\u4ee3\u7801\u793a\u4f8b&#xff1a;<\/p>\n<p><span class=\"token keyword\">const<\/span> arr <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">4<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">5<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\narray<span class=\"token punctuation\">.<\/span><span class=\"token function\">forEach<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">item<span class=\"token punctuation\">,<\/span> index<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&gt;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n  arr<span class=\"token punctuation\">[<\/span>index<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> item <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u5f00\u53d1\u4e2d&#xff0c;\u8981\u907f\u514d\u8fd9\u79cd\u5199\u6cd5<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nconsole<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span>arr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ [2, 3, 4, 5, 6]<\/span><\/p>\n<h6>\u5f52\u5e76\u65b9\u6cd5reduce()<\/h6>\n<p>reduce() \u65b9\u6cd5\u4f1a\u8fed\u4ee3\u6570\u7ec4\u7684\u6240\u6709\u9879&#xff0c;\u5e76\u5728\u6b64\u57fa\u7840\u4e0a\u6784\u5efa\u4e00\u4e2a\u6700\u7ec8\u7684\u8fd4\u56de\u503c&#xff1a;<\/p>\n<p><span class=\"token keyword\">const<\/span> arr <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">4<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">5<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">const<\/span> sum <span class=\"token operator\">&#061;<\/span> arr<span class=\"token punctuation\">.<\/span><span class=\"token function\">reduce<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">acc<span class=\"token punctuation\">,<\/span> cur<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&gt;<\/span> acc <span class=\"token operator\">&#043;<\/span> cur<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ 15<\/span><\/p>\n<h3>\u4f55\u65f6\u9009\u62e9Set&#xff1f;\u4f55\u65f6\u9009\u62e9Array&#xff1f;<\/h3>\n<h4>\u573a\u666f1&#xff1a;\u9700\u8981\u5feb\u901f\u6210\u5458\u68c0\u67e5&#xff1a;\u4f7f\u7528Set<\/h4>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">PermissionSystem<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n  <span class=\"token function\">constructor<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u7528\u6237\u6743\u9650\u96c6\u5408&#xff08;\u5feb\u901f\u67e5\u627e&#xff09;<\/span><br \/>\n    <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>userPermissions <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Set<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n  <span class=\"token punctuation\">}<\/span><\/p>\n<p>  <span class=\"token comment\">\/\/ \u6dfb\u52a0\u6743\u9650<\/span><br \/>\n  <span class=\"token function\">grantPermission<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">permission<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>userPermissions<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span>permission<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n  <span class=\"token punctuation\">}<\/span><\/p>\n<p>  <span class=\"token comment\">\/\/ \u68c0\u67e5\u6743\u9650 &#8211; Set O(1) \u65f6\u95f4\u590d\u6742\u5ea6<\/span><br \/>\n  <span class=\"token function\">hasPermission<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">permission<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>userPermissions<span class=\"token punctuation\">.<\/span><span class=\"token function\">has<\/span><span class=\"token punctuation\">(<\/span>permission<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n  <span class=\"token punctuation\">}<\/span><\/p>\n<p>  <span class=\"token comment\">\/\/ \u6279\u91cf\u68c0\u67e5\u6743\u9650 &#8211; O(n) \u65f6\u95f4\u590d\u6742\u5ea6<\/span><br \/>\n  <span class=\"token function\">hasAllPermissions<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">requiredPermissions<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> requiredPermissions<span class=\"token punctuation\">.<\/span><span class=\"token function\">every<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">permission<\/span> <span class=\"token operator\">&#061;&gt;<\/span><br \/>\n      <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>userPermissions<span class=\"token punctuation\">.<\/span><span class=\"token function\">has<\/span><span class=\"token punctuation\">(<\/span>permission<span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n  <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>\u573a\u666f2&#xff1a;\u9700\u8981\u53bb\u91cd&#xff1a;\u4f7f\u7528Set<\/h4>\n<p><span class=\"token keyword\">const<\/span> duplicateIds <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">4<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">4<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">4<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">5<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">5<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">5<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">5<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u4f7f\u7528 Set \u53bb\u91cd&#xff08;\u4e00\u884c\u4ee3\u7801&#xff09;<\/span><br \/>\n<span class=\"token keyword\">const<\/span> uniqueIds <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token operator\">&#8230;<\/span><span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Set<\/span><span class=\"token punctuation\">(<\/span>duplicateIds<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ [1, 2, 3, 4, 5]<\/span><\/p>\n<h4>\u573a\u666f3&#xff1a;\u6570\u5b66\u96c6\u5408\u8fd0\u7b97&#xff1a;\u4f7f\u7528Set<\/h4>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">SocialNetwork<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n  <span class=\"token function\">constructor<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>users <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Map<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n  <span class=\"token punctuation\">}<\/span><\/p>\n<p>  <span class=\"token comment\">\/\/ \u5e76\u96c6&#xff1a;\u5171\u540c\u597d\u53cb &#043; \u5404\u81ea\u7684\u597d\u53cb<\/span><br \/>\n  <span class=\"token function\">getUnionOfFriends<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">userId1<span class=\"token punctuation\">,<\/span> userId2<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">const<\/span> friends1 <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>users<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span>userId1<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">||<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Set<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">const<\/span> friends2 <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>users<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span>userId2<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">||<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Set<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u5e76\u96c6\u8fd0\u7b97<\/span><br \/>\n    <span class=\"token keyword\">const<\/span> union <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Set<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">[<\/span><span class=\"token operator\">&#8230;<\/span>friends1<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&#8230;<\/span>friends2<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token operator\">&#8230;<\/span>union<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n  <span class=\"token punctuation\">}<\/span><\/p>\n<p>  <span class=\"token comment\">\/\/ \u4ea4\u96c6&#xff1a;\u5171\u540c\u597d\u53cb<\/span><br \/>\n  <span class=\"token function\">getIntersectionOfFriends<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">userId1<span class=\"token punctuation\">,<\/span> userId2<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">const<\/span> friends1 <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>users<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span>userId1<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">||<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Set<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">const<\/span> friends2 <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>users<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span>userId2<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">||<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Set<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u4ea4\u96c6\u8fd0\u7b97<\/span><br \/>\n    <span class=\"token keyword\">const<\/span> intersection <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Set<\/span><span class=\"token punctuation\">(<\/span><br \/>\n      <span class=\"token punctuation\">[<\/span><span class=\"token operator\">&#8230;<\/span>friends1<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">filter<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">friend<\/span> <span class=\"token operator\">&#061;&gt;<\/span> friends2<span class=\"token punctuation\">.<\/span><span class=\"token function\">has<\/span><span class=\"token punctuation\">(<\/span>friend<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token operator\">&#8230;<\/span>intersection<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n  <span class=\"token punctuation\">}<\/span><\/p>\n<p>  <span class=\"token comment\">\/\/ \u5dee\u96c6&#xff1a;A\u6709\u4f46B\u6ca1\u6709\u7684\u597d\u53cb<\/span><br \/>\n  <span class=\"token function\">getDifferenceOfFriends<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">userId1<span class=\"token punctuation\">,<\/span> userId2<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">const<\/span> friends1 <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>users<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span>userId1<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">||<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Set<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">const<\/span> friends2 <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>users<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span>userId2<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">||<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Set<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u5dee\u96c6\u8fd0\u7b97<\/span><br \/>\n    <span class=\"token keyword\">const<\/span> difference <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Set<\/span><span class=\"token punctuation\">(<\/span><br \/>\n      <span class=\"token punctuation\">[<\/span><span class=\"token operator\">&#8230;<\/span>friends1<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">filter<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">friend<\/span> <span class=\"token operator\">&#061;&gt;<\/span> <span class=\"token operator\">!<\/span>friends2<span class=\"token punctuation\">.<\/span><span class=\"token function\">has<\/span><span class=\"token punctuation\">(<\/span>friend<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token operator\">&#8230;<\/span>difference<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n  <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>\u573a\u666f4&#xff1a;\u6709\u5e8f\u6570\u636e\u3001\u9700\u8981\u7d22\u5f15\u8bbf\u95ee\u3001\u4e30\u5bcc\u6570\u7ec4\u64cd\u4f5c&#xff1a;\u4f7f\u7528Array<\/h4>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">ShoppingCart<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n  <span class=\"token function\">constructor<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>items <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u4f7f\u7528 Array&#xff1a;\u9700\u8981\u4fdd\u6301\u987a\u5e8f\u3001\u7d22\u5f15\u8bbf\u95ee\u3001\u5404\u79cd\u6570\u7ec4\u65b9\u6cd5<\/span><br \/>\n  <span class=\"token punctuation\">}<\/span><\/p>\n<p>  <span class=\"token comment\">\/\/ \u6dfb\u52a0\u5546\u54c1\u5230\u8d2d\u7269\u8f66&#xff08;\u4fdd\u6301\u6dfb\u52a0\u987a\u5e8f&#xff09;<\/span><br \/>\n  <span class=\"token function\">addItem<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">product<span class=\"token punctuation\">,<\/span> quantity <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">1<\/span><\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">const<\/span> existingItemIndex <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>items<span class=\"token punctuation\">.<\/span><span class=\"token function\">findIndex<\/span><span class=\"token punctuation\">(<\/span><br \/>\n      <span class=\"token parameter\">item<\/span> <span class=\"token operator\">&#061;&gt;<\/span> item<span class=\"token punctuation\">.<\/span>id <span class=\"token operator\">&#061;&#061;&#061;<\/span> product<span class=\"token punctuation\">.<\/span>id<br \/>\n    <span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>existingItemIndex <span class=\"token operator\">!&#061;&#061;<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n      <span class=\"token comment\">\/\/ \u66f4\u65b0\u5df2\u6709\u5546\u54c1\u6570\u91cf<\/span><br \/>\n      <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>items<span class=\"token punctuation\">[<\/span>existingItemIndex<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>quantity <span class=\"token operator\">&#043;&#061;<\/span> quantity<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n      <span class=\"token comment\">\/\/ \u6dfb\u52a0\u65b0\u5546\u54c1<\/span><br \/>\n      <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>items<span class=\"token punctuation\">.<\/span><span class=\"token function\">push<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token operator\">&#8230;<\/span>product<span class=\"token punctuation\">,<\/span><br \/>\n        quantity<span class=\"token punctuation\">,<\/span><br \/>\n        <span class=\"token literal-property property\">addedAt<\/span><span class=\"token operator\">:<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Date<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token comment\">\/\/ \u8bb0\u5f55\u6dfb\u52a0\u65f6\u95f4<\/span><br \/>\n      <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n  <span class=\"token punctuation\">}<\/span><\/p>\n<p>  <span class=\"token comment\">\/\/ \u6309\u7d22\u5f15\u79fb\u9664\u5546\u54c1<\/span><br \/>\n  <span class=\"token function\">removeItem<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">index<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>index <span class=\"token operator\">&gt;&#061;<\/span> <span class=\"token number\">0<\/span> <span class=\"token operator\">&amp;&amp;<\/span> index <span class=\"token operator\">&lt;<\/span> <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>items<span class=\"token punctuation\">.<\/span>length<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n      <span class=\"token keyword\">return<\/span> <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>items<span class=\"token punctuation\">.<\/span><span class=\"token function\">splice<\/span><span class=\"token punctuation\">(<\/span>index<span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">;<\/span><br \/>\n  <span class=\"token punctuation\">}<\/span><\/p>\n<p>  <span class=\"token comment\">\/\/ \u6309\u5546\u54c1ID\u79fb\u9664<\/span><br \/>\n  <span class=\"token function\">removeItemById<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">productId<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">const<\/span> index <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>items<span class=\"token punctuation\">.<\/span><span class=\"token function\">findIndex<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">item<\/span> <span class=\"token operator\">&#061;&gt;<\/span> item<span class=\"token punctuation\">.<\/span>id <span class=\"token operator\">&#061;&#061;&#061;<\/span> productId<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>index <span class=\"token operator\">!&#061;&#061;<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n      <span class=\"token keyword\">return<\/span> <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">removeItem<\/span><span class=\"token punctuation\">(<\/span>index<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">;<\/span><br \/>\n  <span class=\"token punctuation\">}<\/span><\/p>\n<p>  <span class=\"token comment\">\/\/ \u7b5b\u9009&#xff1a;\u6309\u4ef7\u683c\u8303\u56f4<\/span><br \/>\n  <span class=\"token function\">filterByPriceRange<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">min<span class=\"token punctuation\">,<\/span> max<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>items<span class=\"token punctuation\">.<\/span><span class=\"token function\">filter<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">item<\/span> <span class=\"token operator\">&#061;&gt;<\/span><br \/>\n      item<span class=\"token punctuation\">.<\/span>price <span class=\"token operator\">&gt;&#061;<\/span> min <span class=\"token operator\">&amp;&amp;<\/span> item<span class=\"token punctuation\">.<\/span>price <span class=\"token operator\">&lt;&#061;<\/span> max<br \/>\n    <span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n  <span class=\"token punctuation\">}<\/span><\/p>\n<p>  <span class=\"token comment\">\/\/ \u5206\u9875\u83b7\u53d6\u5546\u54c1<\/span><br \/>\n  <span class=\"token function\">getItemsPaginated<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">page <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> pageSize <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">5<\/span><\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">const<\/span> startIndex <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span>page <span class=\"token operator\">&#8211;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">*<\/span> pageSize<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">const<\/span> endIndex <span class=\"token operator\">&#061;<\/span> startIndex <span class=\"token operator\">&#043;<\/span> pageSize<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>items<span class=\"token punctuation\">.<\/span><span class=\"token function\">slice<\/span><span class=\"token punctuation\">(<\/span>startIndex<span class=\"token punctuation\">,<\/span> endIndex<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n  <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h2>WeakMap\u4e0eWeakSet&#xff1a;\u5f31\u5f15\u7528\u7684\u827a\u672f<\/h2>\n<h3>WeakMap&#xff1a;\u5f31\u5f15\u7528\u7684\u952e\u503c\u5bf9<\/h3>\n<p>WeakMap \u662f Map \u7684\u201c\u5144\u5f1f\u201d\u7c7b\u578b&#xff0c;\u5176 API \u4e5f\u662f Map \u7684\u5b50\u96c6\u3002 WeakMap \u4e2d\u7684 \u201cweak\u201d \u63cf\u8ff0\u7684\u662fJavaScript \u5783\u573e\u56de\u6536\u673a\u5236\u4e2d\u5bf9\u5f85\u201c\u5f31\u6620\u5c04\u201d\u4e2d\u952e\u7684\u65b9\u5f0f\u3002<\/p>\n<p><span class=\"token keyword\">const<\/span> weakMap <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">WeakMap<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h4>WeakMap\u7684\u57fa\u672c\u7279\u6027<\/h4>\n<h5>1. \u952e\u5fc5\u987b\u662f\u5bf9\u8c61&#xff08;\u4e0d\u80fd\u662f\u539f\u59cb\u503c&#xff09;<\/h5>\n<p><span class=\"token keyword\">const<\/span> obj1 <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token literal-property property\">id<\/span><span class=\"token operator\">:<\/span> <span class=\"token number\">1<\/span> <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">const<\/span> obj2 <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token literal-property property\">id<\/span><span class=\"token operator\">:<\/span> <span class=\"token number\">2<\/span> <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">const<\/span> obj3 <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token literal-property property\">id<\/span><span class=\"token operator\">:<\/span> <span class=\"token number\">3<\/span> <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>weakMap<span class=\"token punctuation\">.<\/span><span class=\"token function\">set<\/span><span class=\"token punctuation\">(<\/span>obj1<span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#039;value1&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nweakMap<span class=\"token punctuation\">.<\/span><span class=\"token function\">set<\/span><span class=\"token punctuation\">(<\/span>obj2<span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#039;value2&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nweakMap<span class=\"token punctuation\">.<\/span><span class=\"token function\">set<\/span><span class=\"token punctuation\">(<\/span>obj3<span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#039;value3&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h5>2. \u4e0d\u80fd\u8ba1\u7b97\u5927\u5c0f<\/h5>\n<p>console<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;\u8bbe\u7f6e\u540eweakMap:&#039;<\/span><span class=\"token punctuation\">,<\/span> weakMap<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ &lt;items unknown&gt; <\/span><br \/>\nconsole<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span>weakMap<span class=\"token punctuation\">.<\/span>size<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ undefined \u65e0\u6cd5\u83b7\u53d6size<\/span><\/p>\n<h5>3. \u952e\u662f\u5f31\u5f15\u7528&#xff08;\u4e0d\u4f1a\u963b\u6b62\u5783\u573e\u56de\u6536&#xff09;<\/h5>\n<p><span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">let<\/span> tempObj <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token literal-property property\">id<\/span><span class=\"token operator\">:<\/span> <span class=\"token string\">&#039;temp&#039;<\/span> <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    weakMap<span class=\"token punctuation\">.<\/span><span class=\"token function\">set<\/span><span class=\"token punctuation\">(<\/span>tempObj<span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#039;temp value&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    console<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;\u4e34\u65f6\u5bf9\u8c61\u8bbe\u7f6e\u540e:&#039;<\/span><span class=\"token punctuation\">,<\/span> weakMap<span class=\"token punctuation\">.<\/span><span class=\"token function\">has<\/span><span class=\"token punctuation\">(<\/span>tempObj<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ true<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token comment\">\/\/ tempObj\u79bb\u5f00\u4f5c\u7528\u57df&#xff0c;\u53ef\u4ee5\u88ab\u5783\u573e\u56de\u6536<\/span><br \/>\n<span class=\"token comment\">\/\/ weakMap\u4e2d\u7684\u5bf9\u5e94\u6761\u76ee\u4f1a\u81ea\u52a8\u88ab\u79fb\u9664<\/span><\/p>\n<h5>4. \u6ca1\u6709\u904d\u5386\u65b9\u6cd5&#xff08;\u4e0d\u80fd\u8fed\u4ee3&#xff09;<\/h5>\n<p><span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">const<\/span> <span class=\"token punctuation\">[<\/span>key<span class=\"token punctuation\">,<\/span> value<span class=\"token punctuation\">]<\/span> <span class=\"token keyword\">of<\/span> weakMap<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token punctuation\">}<\/span> <span class=\"token comment\">\/\/ TypeError<\/span><br \/>\nconsole<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span>weakMap<span class=\"token punctuation\">.<\/span><span class=\"token function\">keys<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ TypeError<\/span><\/p>\n<h3>WeakSet&#xff1a;\u5f31\u5f15\u7528\u7684\u96c6\u5408<\/h3>\n<p>WeakSet \u662f Set \u7684\u201c\u5144\u5f1f\u201d\u7c7b\u578b&#xff0c;\u5176 API \u4e5f\u662f Set \u7684\u5b50\u96c6\u3002 WeakSet \u4e2d\u7684 \u201cweak\u201d \u63cf\u8ff0\u7684\u662fJavaScript \u5783\u573e\u56de\u6536\u673a\u5236\u4e2d\u5bf9\u5f85\u201c\u5f31\u96c6\u5408\u201d\u4e2d\u952e\u7684\u65b9\u5f0f\u3002<\/p>\n<p><span class=\"token keyword\">const<\/span> weakSet <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">WeakSet<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h4>WeakSet\u7684\u57fa\u672c\u7279\u6027<\/h4>\n<h5>1. \u503c\u5fc5\u987b\u662f\u5bf9\u8c61<\/h5>\n<p><span class=\"token keyword\">const<\/span> objA <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token literal-property property\">name<\/span><span class=\"token operator\">:<\/span> <span class=\"token string\">&#039;A&#039;<\/span> <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">const<\/span> objB <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token literal-property property\">name<\/span><span class=\"token operator\">:<\/span> <span class=\"token string\">&#039;B&#039;<\/span> <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">const<\/span> objC <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token literal-property property\">name<\/span><span class=\"token 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