{"id":97502,"date":"2026-08-29T17:08:58","date_gmt":"2026-08-29T09:08:58","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/97502.html"},"modified":"2026-08-29T17:08:58","modified_gmt":"2026-08-29T09:08:58","slug":"javascript%e5%85%a5%e9%97%a86","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/97502.html","title":{"rendered":"JavaScript\u5165\u95e86"},"content":{"rendered":"<\/p>\n<h4>\u6587\u7ae0\u76ee\u5f55<\/h4>\n<ul>\n<li>\u5341\u4e03\u3001JavaScript\u4f7f\u7528\u6b63\u5219\u8868\u8fbe\u5f0f<\/li>\n<li>\n<ul>\n<li>1. \u6b63\u5219\u8868\u8fbe\u5f0f\u6982\u8ff0<\/li>\n<li>2. \u6b63\u5219\u8868\u8fbe\u5f0f\u8bed\u6cd5<\/li>\n<li>\n<ul>\n<li>2.1 \u5143\u5b57\u7b26<\/li>\n<li>2.2 \u5b57\u7b26\u8f6c\u4e49<\/li>\n<li>2.3 \u91cd\u590d\u6b21\u6570<\/li>\n<li>2.4 \u5b57\u7b26\u7c7b<\/li>\n<li>2.5 \u5206\u652f\u6761\u4ef6<\/li>\n<li>2.6 \u5206\u7ec4<\/li>\n<li>2.7 \u53cd\u4e49<\/li>\n<\/ul>\n<\/li>\n<li>3. JS \u4e2d\u4f7f\u7528\u6b63\u5219\u8868\u8fbe\u5f0f<\/li>\n<li>\n<ul>\n<li>3.1 JS \u4e2d\u521b\u5efa\u6b63\u5219\u8868\u8fbe\u5f0f\u5bf9\u8c61<\/li>\n<li>\n<ul>\n<li>3.1.1 \u5b57\u9762\u91cf\u65b9\u5f0f&#xff08;\u63a8\u8350&#xff09;<\/li>\n<li>3.1.2 \u6784\u9020\u51fd\u6570\u65b9\u5f0f<\/li>\n<li>3.1.3 \u5e38\u7528\u6807\u5fd7&#xff08;flags&#xff09;<\/li>\n<\/ul>\n<\/li>\n<li>3.2 \u6b63\u5219\u8868\u8fbe\u5f0f\u5bf9\u8c61\u7684\u5e38\u7528\u65b9\u6cd5<\/li>\n<li>\n<ul>\n<li>toString() \u548c source<\/li>\n<li>test<\/li>\n<li>exec<\/li>\n<\/ul>\n<\/li>\n<li>3.3 \u5b9e\u73b0\u90ae\u7bb1\u5730\u5740\u9a8c\u8bc1<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<li>\u5341\u516b\u3001DOM\u7f16\u7a0b<\/li>\n<li>\n<ul>\n<li>1.\u57fa\u672cDOM\u67e5\u8be2\u4e0e\u4fee\u6539<\/li>\n<li>2. \u521b\u5efa\u548c\u6dfb\u52a0\u5143\u7d20<\/li>\n<li>3. \u6837\u5f0f\u64cd\u4f5c<\/li>\n<li>4.\u8868\u5355\u4ea4\u4e92<\/li>\n<li>5. \u904d\u5386DOM<\/li>\n<li>6. \u5143\u7d20\u7684\u4e09\u4e2a\u65b9\u6cd5&#xff1a;<\/li>\n<li>7. \u52a8\u6001\u5217\u8868\u64cd\u4f5c<\/li>\n<li>8. \u7b80\u5355\u7684DOM\u52a8\u753b<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h2>\u5341\u4e03\u3001JavaScript\u4f7f\u7528\u6b63\u5219\u8868\u8fbe\u5f0f<\/h2>\n<h3>1. \u6b63\u5219\u8868\u8fbe\u5f0f\u6982\u8ff0<\/h3>\n<p>\u6b63\u5219\u8868\u8fbe\u5f0f&#xff08;Regular Expression&#xff0c;\u7b80\u79f0 regex \u6216 regexp&#xff09;\u662f\u4e00\u79cd\u7528\u4e8e\u63cf\u8ff0\u5b57\u7b26\u4e32\u6a21\u5f0f\u7684\u7279\u6b8a\u8bed\u6cd5\u3002\u5b83\u7531\u4e00\u7cfb\u5217\u5b57\u7b26\u548c\u7279\u6b8a\u7b26\u53f7\u6784\u6210&#xff0c;\u7528\u4e8e\u5b9a\u4e49\u641c\u7d22\u6a21\u5f0f&#xff0c;\u4e3b\u8981\u7528\u4e8e\u5b57\u7b26\u4e32\u7684\u5339\u914d\u3001\u67e5\u627e\u3001\u66ff\u6362\u548c\u5206\u5272\u7b49\u64cd\u4f5c\u3002\u6b63\u5219\u8868\u8fbe\u5f0f\u63d0\u4f9b\u4e86\u4e00\u79cd\u7075\u6d3b\u3001\u9ad8\u6548\u7684\u65b9\u5f0f\u6765\u5904\u7406\u6587\u672c\u6570\u636e\u3002 \u6b63\u5219\u8868\u8fbe\u5f0f\u4ece 1950 \u5e74\u4ee3\u7406\u8bba\u8d77\u6e90&#xff08;Kleene&#xff09;&#xff0c;\u5230 1960-70 \u5e74\u4ee3 Unix \u5de5\u5177&#xff08;grep&#xff09;\u9996\u6b21\u5e94\u7528&#xff0c;\u518d\u5230 1980-90 \u5e74\u4ee3 Perl \u6269\u5c55\u666e\u53ca&#xff0c;\u6700\u7ec8\u6210\u4e3a \u73b0\u4ee3\u7f16\u7a0b\u8bed\u8a00\u548c\u5de5\u5177\u7684\u6807\u51c6\u529f\u80fd&#xff0c;\u5e7f\u6cdb\u5e94\u7528\u4e8e\u6587\u672c\u5904\u7406\u3001\u6570\u636e\u9a8c\u8bc1\u7b49\u9886\u57df\u3002 \u6b63\u5219\u8868\u8fbe\u5f0f\u4e3b\u8981\u7528\u4e8e \u6587\u672c\u641c\u7d22\u66ff\u6362\u3001\u6570\u636e\u9a8c\u8bc1\u3001\u65e5\u5fd7\u5206\u6790\u3001\u7f51\u7edc\u722c\u866b\u3001\u7f16\u8bd1\u5668\u8bbe\u8ba1 \u548c \u751f\u7269\u4fe1\u606f\u5b66 \u7b49\u9886\u57df\u7684\u6a21\u5f0f\u5339\u914d\u4e0e\u5904\u7406\u3002<\/p>\n<h3>2. \u6b63\u5219\u8868\u8fbe\u5f0f\u8bed\u6cd5<\/h3>\n<h4>2.1 \u5143\u5b57\u7b26<\/h4>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/08\/20260829090856-6a92a1a8e6e49.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h4>2.2 \u5b57\u7b26\u8f6c\u4e49<\/h4>\n<p>\u6b63\u5219\u8868\u8fbe\u5f0f\u4e2d\u4f7f\u7528 \\\\\u5b8c\u6210\u5b57\u7b26\u8f6c\u4e49\u3002\u4f8b\u5982&#xff1a;.\u8868\u793a\u666e\u901a\u7684 .\u5b57\u7b26\u3002<\/p>\n<h4>2.3 \u91cd\u590d\u6b21\u6570<\/h4>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/08\/20260829090857-6a92a1a94f2d8.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h4>2.4 \u5b57\u7b26\u7c7b<\/h4>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/08\/20260829090857-6a92a1a967165.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h4>2.5 \u5206\u652f\u6761\u4ef6<\/h4>\n<p>0\\\\d{2}-\\\\d{8}|0\\\\d{3}-\\\\d{7} \u8fd9\u4e2a\u8868\u8fbe\u5f0f\u80fd\u5339\u914d\u4e24\u79cd\u4ee5\u8fde\u5b57\u53f7\u5206\u9694\u7684\u7535\u8bdd\u53f7\u7801&#xff1a;\u4e00\u79cd\u662f\u4e09\u4f4d\u533a\u53f7&#xff0c;8\u4f4d\u672c\u5730\u53f7(\u5982010-12345678)&#xff0c;\u4e00\u79cd\u662f4\u4f4d\u533a\u53f7&#xff0c;7\u4f4d\u672c\u5730\u53f7(0376-2233445)\u3002<\/p>\n<h4>2.6 \u5206\u7ec4<\/h4>\n<p>(\\\\d{1,3}.){3}\\\\d{1,3} \u4e00\u4e2a\u7b80\u5355\u7684IP\u5730\u5740\u5339\u914d\u8868\u8fbe\u5f0f<\/p>\n<h4>2.7 \u53cd\u4e49<\/h4>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/08\/20260829090857-6a92a1a97ea0c.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h3>3. JS \u4e2d\u4f7f\u7528\u6b63\u5219\u8868\u8fbe\u5f0f<\/h3>\n<h4>3.1 JS \u4e2d\u521b\u5efa\u6b63\u5219\u8868\u8fbe\u5f0f\u5bf9\u8c61<\/h4>\n<p>\u5728 JavaScript \u4e2d&#xff0c;\u4f60\u53ef\u4ee5\u901a\u8fc7\u4e24\u79cd\u65b9\u5f0f\u521b\u5efa\u6b63\u5219\u8868\u8fbe\u5f0f\u5bf9\u8c61&#xff1a;<\/p>\n<h5>3.1.1 \u5b57\u9762\u91cf\u65b9\u5f0f&#xff08;\u63a8\u8350&#xff09;<\/h5>\n<p>\u5bf9\u4e8e\u5df2\u77e5\u7684\u3001\u56fa\u5b9a\u7684\u6a21\u5f0f&#xff0c;\u63a8\u8350\u4f7f\u7528\u5b57\u9762\u91cf\u65b9\u5f0f&#xff0c;\u8bed\u6cd5\u66f4\u7b80\u6d01 \u4f7f\u7528\u659c\u6760 \/ \u5305\u56f4\u6b63\u5219\u8868\u8fbe\u5f0f\u6a21\u5f0f&#xff1a;<\/p>\n<p><span class=\"token keyword\">const<\/span> regex <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">\/<\/span>pattern<span class=\"token operator\">\/<\/span>flags<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token comment\">\/\/ \u5339\u914d\u6240\u6709\u6570\u5b57<\/span><br \/>\n<span class=\"token keyword\">const<\/span> numberRegex <span class=\"token operator\">&#061;<\/span> <span class=\"token regex\"><span class=\"token regex-delimiter\">\/<\/span><span class=\"token regex-source language-regex\">\\\\d&#043;<\/span><span class=\"token regex-delimiter\">\/<\/span><span class=\"token regex-flags\">g<\/span><\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u5339\u914d\u90ae\u7bb1<\/span><br \/>\n<span class=\"token keyword\">const<\/span> emailRegex <span class=\"token operator\">&#061;<\/span> <span class=\"token regex\"><span class=\"token regex-delimiter\">\/<\/span><span class=\"token regex-source language-regex\">^[^\\\\s&#064;]&#043;&#064;[^\\\\s&#064;]&#043;\\\\.[^\\\\s&#064;]&#043;$<\/span><span class=\"token regex-delimiter\">\/<\/span><\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h5>3.1.2 \u6784\u9020\u51fd\u6570\u65b9\u5f0f<\/h5>\n<p>\u5f53\u9700\u8981\u52a8\u6001\u6784\u5efa\u6b63\u5219\u8868\u8fbe\u5f0f\u65f6&#xff08;\u5982\u57fa\u4e8e\u7528\u6237\u8f93\u5165&#xff09;&#xff0c;\u5fc5\u987b\u4f7f\u7528\u6784\u9020\u51fd\u6570\u65b9\u5f0f \u4f7f\u7528 RegExp \u6784\u9020\u51fd\u6570&#xff1a;<\/p>\n<p><span class=\"token comment\">\/\/ \u5339\u914d\u6240\u6709\u6570\u5b57<\/span><br \/>\n<span class=\"token keyword\">const<\/span> numberRegex <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">RegExp<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;\\\\\\\\d&#043;&#039;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#039;g&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u52a8\u6001\u521b\u5efa\u6b63\u5219\u8868\u8fbe\u5f0f<\/span><br \/>\n<span class=\"token keyword\">const<\/span> searchTerm <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#039;hello&#039;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">const<\/span> dynamicRegex <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">RegExp<\/span><span class=\"token punctuation\">(<\/span>searchTerm<span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#039;i&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h5>3.1.3 \u5e38\u7528\u6807\u5fd7&#xff08;flags&#xff09;<\/h5>\n<p>\u25cf i &#8211; \u5ffd\u7565\u5927\u5c0f\u5199 \u25cf g &#8211; \u5168\u5c40\u5339\u914d&#xff08;\u67e5\u627e\u6240\u6709\u5339\u914d\u800c\u975e\u5728\u7b2c\u4e00\u4e2a\u5339\u914d\u540e\u505c\u6b62&#xff09;\u3010\u4e0d\u4f1a\u4ee5\u6362\u884c\u7b26\u4f5c\u4e3a\u5206\u754c\u70b9\u3011 \u25cf m &#8211; \u591a\u884c\u6a21\u5f0f \u3010\u4f1a\u4ee5\u6362\u884c\u7b26\u4f5c\u4e3a\u5206\u754c\u70b9\u3011<\/p>\n<p>g\u548c m\u7684\u533a\u522b&#xff1a;<\/p>\n<p><span class=\"token keyword\">const<\/span> str <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;a1\\\\na2\\\\na3&#034;<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u5b57\u7b26\u4e32\u90fd\u6709match\u65b9\u6cd5&#xff0c;\u5b57\u7b26\u4e32\u7684match\u65b9\u6cd5\u8fd4\u56de\u6570\u7ec4&#xff0c;\u8fd9\u4e2a\u6570\u7ec4\u4e2d\u90fd\u662f\u80fd\u591f\u5339\u914d\u4e0a\u6b63\u5219\u8868\u8fbe\u5f0f\u7684\u5b57\u7b26\u4e32\u3002<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u6ca1\u6709 m&#xff1a;^ \u53ea\u5339\u914d\u6574\u4e2a\u5b57\u7b26\u4e32\u7684\u5f00\u5934<\/span><br \/>\n<span class=\"token comment\">\/\/ \u4f60\u53ef\u80fd\u4f1a\u6709\u4e00\u4e2a\u7591\u95ee&#xff1f;\u4e0d\u662f\u8bf4g\u662f\u5168\u5c40\u5339\u914d\u5417&#xff1f;\u600e\u4e48\u53c8\u53d8\u6210&#034;\u53ea\u5339\u914d\u6574\u4e2a\u5b57\u7b26\u4e32\u7684\u5f00\u5934&#034;\u4e86&#xff1f;<\/span><br \/>\n<span class=\"token comment\">\/\/ g \u786e\u5b9e\u662f\u5339\u914d\u5168\u5c40&#xff0c;\u4ee5\u4e0b\u8fd9\u4e2a\u6b63\u5219\u8868\u8fbe\u5f0f\u53ea\u5339\u914d\u5f00\u5934\u662f ^ \u7b26\u53f7\u51b3\u5b9a\u7684\u3002<\/span><br \/>\n<span class=\"token comment\">\/\/ \u4ee5\u4e0b\u8fd9\u4e2amatch\u5339\u914d\u7684\u662f&#xff1a;\u4e0d\u7ba1\u4f60\u5b57\u7b26\u4e32\u6709\u591a\u5c11\u884c&#xff0c;\u8fd4\u56de\u7684\u5c31\u662f\u6574\u4e2a\u5b57\u7b26\u4e32\u7684\u5f00\u5934\u3002<\/span><br \/>\nstr<span class=\"token punctuation\">.<\/span><span class=\"token function\">match<\/span><span class=\"token punctuation\">(<\/span><span class=\"token regex\"><span class=\"token regex-delimiter\">\/<\/span><span class=\"token regex-source language-regex\">^a\\\\d<\/span><span class=\"token regex-delimiter\">\/<\/span><span class=\"token regex-flags\">g<\/span><\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>   <span class=\"token comment\">\/\/ [&#034;a1&#034;]<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u6709 m&#xff1a;^ \u5339\u914d\u6bcf\u884c\u7684\u5f00\u5934&#xff08;\u8981\u60f3\u8fbe\u5230\u5339\u914d\u6bcf\u4e00\u884c\u7684\u5f00\u5934&#xff0c;\u5fc5\u987bgm\u8054\u5408\u4f7f\u7528\u3002\u5355\u72ec\u4e00\u4e2am\u53ea\u662f\u4f1a\u83b7\u53d6\u5230\u7b2c\u4e00\u4e2a\u3002&#xff09;<\/span><br \/>\n<span class=\"token comment\">\/\/ m\u662f\u4ee5\u6362\u884c\u7b26\u4f5c\u4e3a\u5206\u754c\u70b9\u7684\u3002g\u4e0d\u4f1a\u4ee5\u6362\u884c\u7b26\u4f5c\u4e3a\u5206\u754c\u70b9\u3002<\/span><br \/>\nstr<span class=\"token punctuation\">.<\/span><span class=\"token function\">match<\/span><span class=\"token punctuation\">(<\/span><span class=\"token regex\"><span class=\"token regex-delimiter\">\/<\/span><span class=\"token regex-source language-regex\">^a\\\\d<\/span><span class=\"token regex-delimiter\">\/<\/span><span class=\"token regex-flags\">gm<\/span><\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ [&#034;a1&#034;, &#034;a2&#034;, &#034;a3&#034;]<\/span><\/p>\n<p>\u6ce8\u610f&#xff1a;\u5982\u679c\u6b63\u5219\u8868\u8fbe\u5f0f\u4e2d\u6ca1\u6709 ^\u6216 $&#xff0c;g\u548c gm\u6ca1\u6709\u533a\u522b\u3002<\/p>\n<h4>3.2 \u6b63\u5219\u8868\u8fbe\u5f0f\u5bf9\u8c61\u7684\u5e38\u7528\u65b9\u6cd5<\/h4>\n<h5>toString() \u548c source<\/h5>\n<p><span class=\"token comment\">\/\/toString \u548c source \u7684\u533a\u522b&#xff1a;<\/span><br \/>\n<span class=\"token keyword\">let<\/span> regExp1 <span class=\"token operator\">&#061;<\/span> <span class=\"token regex\"><span class=\"token regex-delimiter\">\/<\/span><span class=\"token regex-source language-regex\">^a\\\\d{6,}<\/span><span class=\"token regex-delimiter\">\/<\/span><span class=\"token regex-flags\">gi<\/span><\/span><span class=\"token punctuation\">;<\/span><br \/>\nconsole<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span>regExp1<span class=\"token punctuation\">.<\/span><span class=\"token function\">toString<\/span><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>regExp1<span class=\"token punctuation\">.<\/span>source<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/08\/20260829090857-6a92a1a997144.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h5>test<\/h5>\n<p>\u8fd4\u56de\u503c&#xff1a;boolean  \u4f7f\u7528\u573a\u666f&#xff1a;\u5feb\u901f\u9a8c\u8bc1\u5b57\u7b26\u4e32\u662f\u5426\u5339\u914d\u6a21\u5f0f&#xff08;\u4e5f\u53ef\u4ee5\u7528\u5b57\u7b26\u4e32\u7684\u65b9\u6cd5match&#xff09;<\/p>\n<p><span class=\"token comment\">\/\/\u6b63\u5219\u8868\u8fbe\u5f0f\u7684test\u65b9\u6cd5:<\/span><br \/>\n        <span class=\"token keyword\">let<\/span> reg <span class=\"token operator\">&#061;<\/span> <span class=\"token regex\"><span class=\"token regex-delimiter\">\/<\/span><span class=\"token regex-source language-regex\">^[a-zA-Z0-9_$]{6,}$<\/span><span class=\"token regex-delimiter\">\/<\/span><\/span><span class=\"token punctuation\">;<\/span><br \/>\n        console<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span>reg<span class=\"token punctuation\">.<\/span><span class=\"token function\">test<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;1234rgp$__&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><span class=\"token comment\">\/\/true<\/span><br \/>\n        console<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span>reg<span class=\"token punctuation\">.<\/span><span class=\"token function\">test<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;1234rgp$__\u96c6&#034;<\/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>exec<\/h5>\n<p>\u8fd4\u56de\u503c&#xff1a;Array\u6216 null  \u4f7f\u7528\u573a\u666f&#xff1a;\u63d0\u53d6\u5339\u914d\u7ec6\u8282&#xff08;\u4f4d\u7f6e\u7b49\u4fe1\u606f&#xff09;<\/p>\n<p> <span class=\"token comment\">\/\/exec\u65b9\u6cd5&#xff1a;<\/span><br \/>\n        <span class=\"token keyword\">let<\/span> reg1 <span class=\"token operator\">&#061;<\/span> <span class=\"token regex\"><span class=\"token regex-delimiter\">\/<\/span><span class=\"token regex-source language-regex\">\\\\d&#043;<\/span><span class=\"token regex-delimiter\">\/<\/span><span class=\"token regex-flags\">g<\/span><\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">let<\/span> str1 <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#039;123k456k789k&#039;<\/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>reg1<span class=\"token punctuation\">.<\/span><span class=\"token function\">exec<\/span><span class=\"token punctuation\">(<\/span>str1<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><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/123<\/span><br \/>\n        console<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span>reg1<span class=\"token punctuation\">.<\/span><span class=\"token function\">exec<\/span><span class=\"token punctuation\">(<\/span>str1<span class=\"token punctuation\">)<\/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\">\/\/undefined<\/span><br \/>\n        console<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span>reg1<span class=\"token punctuation\">.<\/span><span class=\"token function\">exec<\/span><span class=\"token punctuation\">(<\/span>str1<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><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/789<\/span><br \/>\n        console<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span>reg1<span class=\"token punctuation\">.<\/span><span class=\"token function\">exec<\/span><span class=\"token punctuation\">(<\/span>str1<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>     <span class=\"token comment\">\/\/null<\/span><\/p>\n<p>exec\u548cmatch\u7684\u6bd4\u8f83<\/p>\n<p>    <span class=\"token comment\">\/\/exec \u65b9\u6cd5<\/span><br \/>\n        <span class=\"token keyword\">const<\/span> str <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#039;123x456y789&#039;<\/span><br \/>\n        <span class=\"token keyword\">const<\/span> regExp <span class=\"token operator\">&#061;<\/span> <span class=\"token regex\"><span class=\"token regex-delimiter\">\/<\/span><span class=\"token regex-source language-regex\">\\\\d&#043;<\/span><span class=\"token regex-delimiter\">\/<\/span><span class=\"token regex-flags\">g<\/span><\/span><span class=\"token punctuation\">;<\/span><span class=\"token comment\">\/\/g\u6807\u5fd7\u975e\u5e38\u91cd\u8981\u3002<\/span><br \/>\n        <span class=\"token keyword\">let<\/span> match<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">while<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>match <span class=\"token operator\">&#061;<\/span> regExp<span class=\"token punctuation\">.<\/span><span class=\"token function\">exec<\/span><span class=\"token punctuation\">(<\/span>str<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">!&#061;&#061;<\/span> <span class=\"token keyword\">null<\/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>match<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/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\">\/\/match \u65b9\u6cd5<\/span><br \/>\n    <span class=\"token keyword\">const<\/span> str1 <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#039;123x456y789&#039;<\/span><br \/>\n    <span class=\"token keyword\">const<\/span> regExp1 <span class=\"token operator\">&#061;<\/span> <span class=\"token regex\"><span class=\"token regex-delimiter\">\/<\/span><span class=\"token regex-source language-regex\">\\\\d&#043;<\/span><span class=\"token regex-delimiter\">\/<\/span><span class=\"token regex-flags\">g<\/span><\/span><span class=\"token punctuation\">;<\/span><span class=\"token comment\">\/\/g\u6807\u5fd7\u975e\u5e38\u91cd\u8981\u3002<\/span><br \/>\n    <span class=\"token keyword\">let<\/span> result <span class=\"token operator\">&#061;<\/span> str1<span class=\"token punctuation\">.<\/span><span class=\"token function\">match<\/span><span class=\"token punctuation\">(<\/span>regExp1<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    result<span class=\"token punctuation\">.<\/span><span class=\"token function\">forEach<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">item<\/span> <span class=\"token operator\">&#061;&gt;<\/span> console<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span>item<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<h4>3.3 \u5b9e\u73b0\u90ae\u7bb1\u5730\u5740\u9a8c\u8bc1<\/h4>\n<p><span class=\"token doctype\"><span class=\"token punctuation\">&lt;!<\/span><span class=\"token doctype-tag\">DOCTYPE<\/span> <span class=\"token name\">html<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>html<\/span> <span class=\"token attr-name\">lang<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>en<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>head<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>meta<\/span> <span class=\"token attr-name\">charset<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>UTF-8<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>meta<\/span> <span class=\"token attr-name\">name<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>viewport<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">content<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>width&#061;device-width, initial-scale&#061;1.0<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>title<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>Document<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>title<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>head<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>body<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    \u90ae\u7bb1\u5730\u5740&#xff1a;<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>input<\/span> <span class=\"token attr-name\">type<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>text<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">id<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>email<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">placeholder<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>\u8bf7\u8f93\u5165\u5408\u6cd5\u7684\u90ae\u7bb1\u5730\u5740<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>span<\/span> <span class=\"token attr-name\">id<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>emailError<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>span<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<p>    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>script<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token script\"><span class=\"token language-javascript\"><br \/>\n        document<span class=\"token punctuation\">.<\/span><span class=\"token function\">addEventListener<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;DOMContentLoaded&#034;<\/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><br \/>\n            <span class=\"token keyword\">let<\/span> email <span class=\"token operator\">&#061;<\/span> document<span class=\"token punctuation\">.<\/span><span class=\"token function\">getElementById<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;email&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token comment\">\/\/\u83b7\u53d6\u7126\u70b9\u4e8b\u4ef6<\/span><br \/>\n            email<span class=\"token punctuation\">.<\/span><span class=\"token function\">addEventListener<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;focus&#034;<\/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><br \/>\n                <span class=\"token keyword\">let<\/span> emailError <span class=\"token operator\">&#061;<\/span> document<span class=\"token punctuation\">.<\/span><span class=\"token function\">getElementById<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;emailError&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                emailError<span class=\"token punctuation\">.<\/span>innerText <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>            <span class=\"token comment\">\/\/\u5931\u53bb\u7126\u70b9\u4e8b\u4ef6<\/span><br \/>\n            email<span class=\"token punctuation\">.<\/span><span class=\"token function\">addEventListener<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;blur&#034;<\/span><span class=\"token punctuation\">,<\/span><span class=\"token keyword\">function<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token keyword\">let<\/span> emailValue <span class=\"token operator\">&#061;<\/span> email<span class=\"token punctuation\">.<\/span>value<span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token keyword\">const<\/span> RegExp <span class=\"token operator\">&#061;<\/span> <span class=\"token regex\"><span class=\"token regex-delimiter\">\/<\/span><span class=\"token regex-source language-regex\">^[a-zA-Z0-9.!#$%&amp;&#039;*&#043;\/&#061;?^_&#096;{|}~-]&#043;&#064;[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\\\\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*$<\/span><span class=\"token regex-delimiter\">\/<\/span><\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token keyword\">let<\/span> ok <span class=\"token operator\">&#061;<\/span> RegExp<span class=\"token punctuation\">.<\/span><span class=\"token function\">test<\/span><span class=\"token punctuation\">(<\/span>emailValue<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>                <span class=\"token keyword\">let<\/span> emailError <span class=\"token operator\">&#061;<\/span> document<span class=\"token punctuation\">.<\/span><span class=\"token function\">getElementById<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;emailError&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>ok<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n                    emailError<span class=\"token punctuation\">.<\/span>innerText <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;\u8f93\u5165\u5730\u5740\u5408\u6cd5&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                    emailError<span class=\"token punctuation\">.<\/span>style<span class=\"token punctuation\">.<\/span>color <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;green&#034;<\/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                    emailError<span class=\"token punctuation\">.<\/span>innerText <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;\u8f93\u5165\u5730\u5740\u4e0d\u5408\u6cd5&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                    emailError<span class=\"token punctuation\">.<\/span>style<span class=\"token punctuation\">.<\/span>color <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;red&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token punctuation\">}<\/span><br \/>\n            <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><\/span><span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>script<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>body<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>html<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<h2>\u5341\u516b\u3001DOM\u7f16\u7a0b<\/h2>\n<p>DOM\u7f16\u7a0b\u662f\u6307\u4f7f\u7528JavaScript\u6765\u64cd\u4f5c\u6587\u6863\u5bf9\u8c61\u6a21\u578b(Document Object Model)&#xff0c;\u4ece\u800c\u52a8\u6001\u5730\u6539\u53d8\u7f51\u9875\u5185\u5bb9\u3001\u7ed3\u6784\u548c\u6837\u5f0f\u7684\u7f16\u7a0b\u65b9\u5f0f\u3002<\/p>\n<h3>1.\u57fa\u672cDOM\u67e5\u8be2\u4e0e\u4fee\u6539<\/h3>\n<p><span class=\"token comment\">\/\/ \u83b7\u53d6\u5143\u7d20<\/span><br \/>\n        <span class=\"token comment\">\/\/ 1.\u901a\u8fc7id\u83b7\u53d6,\u8fd4\u56de\u4e00\u4e2a<\/span><br \/>\n        <span class=\"token keyword\">const<\/span> outer <span class=\"token operator\">&#061;<\/span> document<span class=\"token punctuation\">.<\/span><span class=\"token function\">getElementById<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;outer&#034;<\/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>outer<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token comment\">\/\/2.\u901a\u8fc7class\u83b7\u53d6&#xff0c;\u8fd4\u56de\u6570\u7ec4<\/span><br \/>\n        <span class=\"token keyword\">const<\/span> allMyDiv <span class=\"token operator\">&#061;<\/span> document<span class=\"token punctuation\">.<\/span><span class=\"token function\">getElementsByClassName<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;myDiv&#034;<\/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>allMyDiv<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token comment\">\/\/3.\u901a\u8fc7\u6807\u7b7e\u540d\u5b57\u83b7\u53d6&#xff0c;\u8fd4\u56de\u6570\u7ec4<\/span><br \/>\n        <span class=\"token keyword\">const<\/span> allDiv <span class=\"token operator\">&#061;<\/span> document<span class=\"token punctuation\">.<\/span><span class=\"token function\">getElementsByTagName<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;div&#034;<\/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>allDiv<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token comment\">\/\/4.\u901a\u8fc7name\u83b7\u53d6&#xff0c;\u8fd4\u56de\u6570\u7ec4<\/span><br \/>\n        <span class=\"token keyword\">const<\/span> hobbies <span class=\"token operator\">&#061;<\/span> document<span class=\"token punctuation\">.<\/span><span class=\"token function\">getElementsByName<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;hobby&#034;<\/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>hobbies<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token comment\">\/\/5. \u66f4\u52a0\u73b0\u4ee3\u7684\u5199\u6cd5&#xff0c;\u901a\u8fc7css\u9009\u62e9\u5668\u7684\u8bed\u6cd5&#xff0c;\u8fd4\u56de\u5339\u914d\u7684\u7b2c\u4e00\u4e2a<\/span><br \/>\n        <span class=\"token keyword\">const<\/span> firstMyDiv <span class=\"token operator\">&#061;<\/span> document<span class=\"token punctuation\">.<\/span><span class=\"token function\">querySelector<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;.myDiv&#034;<\/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>firstMyDiv<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token comment\">\/\/6.document.querySelectorAll<\/span><br \/>\n        <span class=\"token keyword\">const<\/span> allMyDiv2 <span class=\"token operator\">&#061;<\/span> document<span class=\"token punctuation\">.<\/span><span class=\"token function\">querySelectorAll<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;.myDiv&#034;<\/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>allMyDiv2<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/\u67e5\u627e\u79bbelement\u6700\u8fd1\u7684\u7956\u5148\u5143\u7d20(\u4ece\u5f53\u524d\u5143\u7d20\u5f00\u59cb\u5411\u4e0a\u67e5\u627e\u5339\u914d\u6307\u5b9a\u9009\u62e9\u5668\u7684\u6700\u8fd1\u7684\u7956\u5148\u5143\u7d20(\u5305\u62ec\u81ea\u5df1))<\/span><br \/>\n        <span class=\"token comment\">\/\/\u8fd4\u56de\u4e00\u4e2a\u503c\u3002\u4ece\u81ea\u5df1\u5f00\u59cb\u5339\u914d&#xff0c;\u81ea\u5df1\u7b26\u5408\u5c31\u8fd4\u56de\u81ea\u5df1&#xff0c;\u81ea\u5df1\u4e0d\u7b26\u5408\u518d\u627e\u6700\u8fd1\u7684\u7956\u5148\u3002<\/span><br \/>\n        <span class=\"token keyword\">const<\/span> elt <span class=\"token operator\">&#061;<\/span> document<span class=\"token punctuation\">.<\/span><span class=\"token function\">getElementById<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;myDiv&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">const<\/span> myDiv <span class=\"token operator\">&#061;<\/span> elt<span class=\"token punctuation\">.<\/span><span class=\"token function\">closest<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;.myDiv&#034;<\/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>myDiv<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/\u5224\u65ad\u5143\u7d20\u662f\u5426\u7b26\u5408\u6307\u5b9a\u7684\u9009\u62e9\u5668<\/span><br \/>\n        <span class=\"token keyword\">const<\/span> isMatch <span class=\"token operator\">&#061;<\/span> elt<span class=\"token punctuation\">.<\/span><span class=\"token function\">matches<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;.myDiv&#034;<\/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>isMatch<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/\u83b7\u53d6\u7236\u8282\u70b9\u7684\u7b2c\u4e00\u4e2a\u6216\u6700\u540e\u4e00\u4e2a\u5b50\u5143\u7d20<\/span><br \/>\n        <span class=\"token keyword\">const<\/span> fu <span class=\"token operator\">&#061;<\/span> document<span class=\"token punctuation\">.<\/span><span class=\"token function\">getElementById<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;outer&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">let<\/span> firstZi <span class=\"token operator\">&#061;<\/span> fu<span class=\"token punctuation\">.<\/span>firstElementChild<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">let<\/span> lastZi <span class=\"token operator\">&#061;<\/span> fu<span class=\"token punctuation\">.<\/span>lastElementChild<span class=\"token punctuation\">;<\/span><br \/>\n        console<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span>firstZi<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>lastZi<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h3>2. \u521b\u5efa\u548c\u6dfb\u52a0\u5143\u7d20<\/h3>\n<p><span class=\"token doctype\"><span class=\"token punctuation\">&lt;!<\/span><span class=\"token doctype-tag\">DOCTYPE<\/span> <span class=\"token name\">html<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>html<\/span> <span class=\"token attr-name\">lang<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>en<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>head<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>meta<\/span> <span class=\"token attr-name\">charset<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>UTF-8<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>meta<\/span> <span class=\"token attr-name\">name<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>viewport<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">content<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>width&#061;device-width, initial-scale&#061;1.0<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>title<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>Document<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>title<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>head<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>body<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>button<\/span> <span class=\"token attr-name\">id<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>addItem<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\u5411ul\u6807\u7b7e\u5185\u90e8\u672b\u5c3e\u6dfb\u52a0\u4e00\u4e2ali<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>button<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>button<\/span> <span class=\"token attr-name\">id<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>addItems<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\u5411ul\u6807\u7b7e\u5185\u90e8\u672b\u5c3e\u6dfb\u52a0\u591a\u4e2ali&#xff0c;\u4f7f\u7528\u7247\u6bb5\u65b9\u5f0f<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>button<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>ul<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n        <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>li<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\u9879\u76ee1<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>li<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n        <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>li<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\u9879\u76ee2<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>li<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n        <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>li<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\u9879\u76ee3<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>li<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>ul<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<p>    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>button<\/span> <span class=\"token attr-name\">id<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>insertBeforeBtn<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\u5728\u6bb5\u843d\u6807\u7b7e\u524d\u6dfb\u52a0\u4e00\u4e2a\u65b0\u7684\u6bb5\u843d<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>button<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>div<\/span> <span class=\"token attr-name\">id<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>d<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n        <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>p<\/span> <span class=\"token attr-name\">id<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>p<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span>123456<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>p<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>div<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<p>    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>script<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token script\"><span class=\"token language-javascript\"><\/p>\n<p>        document<span class=\"token punctuation\">.<\/span><span class=\"token function\">addEventListener<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;DOMContentLoaded&#034;<\/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><br \/>\n            <span class=\"token comment\">\/\/\u521b\u5efa\u8282\u70b9\u5e76\u6dfb\u52a0\u5230\u672b\u5c3e<\/span><br \/>\n            document<span class=\"token punctuation\">.<\/span><span class=\"token function\">getElementById<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;addItem&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">addEventListener<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;click&#034;<\/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><br \/>\n                <span class=\"token keyword\">let<\/span> liNode <span class=\"token operator\">&#061;<\/span> document<span class=\"token punctuation\">.<\/span><span class=\"token function\">createElement<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;li&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                liNode<span class=\"token punctuation\">.<\/span>textContent <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;\u9879\u76ee4&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                document<span class=\"token punctuation\">.<\/span><span class=\"token function\">querySelector<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;ul&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">appendChild<\/span><span class=\"token punctuation\">(<\/span>liNode<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>            <span class=\"token comment\">\/\/\u6307\u5b9a\u5728\u67d0\u4e00\u8282\u70b9\u524d\u6dfb\u52a0\u5143\u7d20<\/span><br \/>\n            document<span class=\"token punctuation\">.<\/span><span class=\"token function\">getElementById<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;insertBeforeBtn&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">addEventListener<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;click&#034;<\/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><br \/>\n                <span class=\"token keyword\">let<\/span> newP <span class=\"token operator\">&#061;<\/span> document<span class=\"token punctuation\">.<\/span><span class=\"token function\">createElement<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;p&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                newP<span class=\"token punctuation\">.<\/span>textContent <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;\u8fd9\u662f\u4e00\u4e2a\u65b0\u7684\u6bb5\u843d&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token keyword\">let<\/span> fu <span class=\"token operator\">&#061;<\/span> document<span class=\"token punctuation\">.<\/span><span class=\"token function\">querySelector<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;div&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token keyword\">let<\/span> p <span class=\"token operator\">&#061;<\/span> document<span class=\"token punctuation\">.<\/span><span class=\"token function\">querySelector<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;#p&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                fu<span class=\"token punctuation\">.<\/span><span class=\"token function\">insertBefore<\/span><span class=\"token punctuation\">(<\/span>newP<span class=\"token punctuation\">,<\/span>p<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>            <span class=\"token comment\">\/\/\u4f7f\u7528\u7247\u6bb5\u65b9\u5f0f&#xff0c;\u6dfb\u52a0\u591a\u4e2a\u8282\u70b9<\/span><br \/>\n            document<span class=\"token punctuation\">.<\/span><span class=\"token function\">getElementById<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;addItems&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">addEventListener<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;click&#034;<\/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><br \/>\n                <span class=\"token keyword\">const<\/span> fragment <span class=\"token operator\">&#061;<\/span> document<span class=\"token punctuation\">.<\/span><span class=\"token function\">createDocumentFragment<\/span><span class=\"token punctuation\">(<\/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\">let<\/span> i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">1<\/span> <span class=\"token punctuation\">;<\/span>i <span class=\"token operator\">&lt;&#061;<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">;<\/span>i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n                    <span class=\"token keyword\">const<\/span> liNode <span class=\"token operator\">&#061;<\/span> document<span class=\"token punctuation\">.<\/span><span class=\"token function\">createElement<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;li&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                    liNode<span class=\"token punctuation\">.<\/span>textContent<span class=\"token operator\">&#061;<\/span><span class=\"token template-string\"><span class=\"token template-punctuation string\">&#096;<\/span><span class=\"token string\">\u9879\u76ee<\/span><span class=\"token interpolation\"><span class=\"token interpolation-punctuation punctuation\">${<\/span>i<span class=\"token interpolation-punctuation punctuation\">}<\/span><\/span><span class=\"token template-punctuation string\">&#096;<\/span><\/span><span class=\"token punctuation\">;<\/span><br \/>\n                    fragment<span class=\"token punctuation\">.<\/span><span class=\"token function\">appendChild<\/span><span class=\"token punctuation\">(<\/span>liNode<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token punctuation\">}<\/span><br \/>\n                document<span class=\"token punctuation\">.<\/span><span class=\"token function\">querySelector<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;ul&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">appendChild<\/span><span class=\"token punctuation\">(<\/span>fragment<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 punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>    <\/span><\/span><span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>script<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>body<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>html<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<h3>3. \u6837\u5f0f\u64cd\u4f5c<\/h3>\n<p><span class=\"token doctype\"><span class=\"token punctuation\">&lt;!<\/span><span class=\"token doctype-tag\">DOCTYPE<\/span> <span class=\"token name\">html<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>html<\/span> <span class=\"token attr-name\">lang<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>en<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>head<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>meta<\/span> <span class=\"token attr-name\">charset<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>UTF-8<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>meta<\/span> <span class=\"token attr-name\">name<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>viewport<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">content<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>width&#061;device-width, initial-scale&#061;1.0<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>title<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>Document<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>title<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>style<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token style\"><span class=\"token language-css\"><br \/>\n        <span class=\"token selector\">#div1<\/span><span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token property\">width<\/span><span class=\"token punctuation\">:<\/span> 200px<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token property\">height<\/span><span class=\"token punctuation\">:<\/span> 200px<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token property\">border<\/span><span class=\"token punctuation\">:<\/span> 1px<span class=\"token punctuation\">,<\/span>solid<span class=\"token punctuation\">,<\/span>black<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token property\">background-color<\/span><span class=\"token punctuation\">:<\/span> aqua<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token selector\">.class1<\/span><span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token property\">width<\/span><span class=\"token punctuation\">:<\/span> 100px<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token property\">height<\/span><span class=\"token punctuation\">:<\/span> 100px<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token property\">border<\/span><span class=\"token punctuation\">:<\/span> 1px<span class=\"token punctuation\">,<\/span>solid<span class=\"token punctuation\">,<\/span>black<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token property\">background-color<\/span><span class=\"token punctuation\">:<\/span> <span class=\"token function\">rgb<\/span><span class=\"token punctuation\">(<\/span>136<span class=\"token punctuation\">,<\/span> 0<span class=\"token punctuation\">,<\/span> 255<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token selector\">.class2<\/span><span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token property\">width<\/span><span class=\"token punctuation\">:<\/span> 100px<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token property\">height<\/span><span class=\"token punctuation\">:<\/span> 100px<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token property\">border<\/span><span class=\"token punctuation\">:<\/span> 1px<span class=\"token punctuation\">,<\/span>solid<span class=\"token punctuation\">,<\/span>black<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token property\">background-color<\/span><span class=\"token punctuation\">:<\/span> <span class=\"token function\">rgb<\/span><span class=\"token punctuation\">(<\/span>222<span class=\"token punctuation\">,<\/span> 19<span class=\"token punctuation\">,<\/span> 19<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <\/span><\/span><span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>style<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>head<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>body<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>button<\/span> <span class=\"token attr-name\">id<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>changeStyleBtn<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\u4fee\u6539div\u6837\u5f0f<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>button<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>button<\/span> <span class=\"token attr-name\">id<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>changeStyleBtnToClass1<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\u5207\u6362class1\u6837\u5f0f<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>button<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>button<\/span> <span class=\"token attr-name\">id<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>changeStyleBtnToClass2<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\u5207\u6362class2\u6837\u5f0f<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>button<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>button<\/span> <span class=\"token attr-name\">id<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>changeStyleBtnByClass<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\u6765\u56de\u5207\u6362class\u6837\u5f0f<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>button<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>div<\/span> <span class=\"token attr-name\">id<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>div1<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>div<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>div<\/span> <span class=\"token attr-name\">id<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>div2<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">class<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>class1<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\u901a\u8fc7class\u4fee\u6539\u6837\u5f0f<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>div<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>script<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token script\"><span class=\"token language-javascript\"><br \/>\n        document<span class=\"token punctuation\">.<\/span><span class=\"token function\">addEventListener<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;DOMContentLoaded&#034;<\/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><\/p>\n<p>            <span class=\"token comment\">\/\/\u5143\u7d20.style.\u6837\u5f0f<\/span><br \/>\n            document<span class=\"token punctuation\">.<\/span><span class=\"token function\">getElementById<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;changeStyleBtn&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">addEventListener<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;click&#034;<\/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><br \/>\n                <span class=\"token keyword\">let<\/span> div1 <span class=\"token operator\">&#061;<\/span> document<span class=\"token punctuation\">.<\/span><span class=\"token function\">getElementById<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;div1&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                div1<span class=\"token punctuation\">.<\/span>style<span class=\"token punctuation\">.<\/span>width <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#039;100px&#039;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                div1<span class=\"token punctuation\">.<\/span>style<span class=\"token punctuation\">.<\/span>height <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#039;100px&#039;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                div1<span class=\"token punctuation\">.<\/span>style<span class=\"token punctuation\">.<\/span>backgroundColor <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#039;red&#039;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>            <span class=\"token comment\">\/\/\u5207\u6362class<\/span><br \/>\n            document<span class=\"token punctuation\">.<\/span><span class=\"token function\">getElementById<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;changeStyleBtnToClass2&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">addEventListener<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;click&#034;<\/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><br \/>\n                <span class=\"token keyword\">let<\/span> div2 <span class=\"token operator\">&#061;<\/span> document<span class=\"token punctuation\">.<\/span><span class=\"token function\">getElementById<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;div2&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                div2<span class=\"token punctuation\">.<\/span>className <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#039;class2&#039;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><br \/>\n            document<span class=\"token punctuation\">.<\/span><span class=\"token function\">getElementById<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;changeStyleBtnToClass1&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">addEventListener<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;click&#034;<\/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><br \/>\n                <span class=\"token keyword\">let<\/span> div2 <span class=\"token operator\">&#061;<\/span> document<span class=\"token punctuation\">.<\/span><span class=\"token function\">getElementById<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;div2&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                div2<span class=\"token punctuation\">.<\/span>className <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#039;class1&#039;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><br \/>\n            document<span class=\"token punctuation\">.<\/span><span class=\"token function\">getElementById<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;changeStyleBtnByClass&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">addEventListener<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;click&#034;<\/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><br \/>\n                <span class=\"token keyword\">let<\/span> div2 <span class=\"token operator\">&#061;<\/span> document<span class=\"token punctuation\">.<\/span><span class=\"token function\">getElementById<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;div2&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                div2<span class=\"token punctuation\">.<\/span>classList<span class=\"token punctuation\">.<\/span><span class=\"token function\">toggle<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;class2&#039;<\/span><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 punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <\/span><\/span><span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>script<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>body<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>html<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<h3>4.\u8868\u5355\u4ea4\u4e92<\/h3>\n<p><span class=\"token comment\">\/\/ \u793a\u4f8b1&#xff1a;\u83b7\u53d6\u8868\u5355\u8f93\u5165\u503c<\/span><br \/>\ndocument<span class=\"token punctuation\">.<\/span><span class=\"token function\">getElementById<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;submit-btn&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">addEventListener<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;click&#039;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">function<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">e<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    e<span class=\"token punctuation\">.<\/span><span class=\"token function\">preventDefault<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u963b\u6b62\u8868\u5355\u9ed8\u8ba4\u63d0\u4ea4\u884c\u4e3a<\/span><br \/>\n    <span class=\"token keyword\">let<\/span> input <span class=\"token operator\">&#061;<\/span> document<span class=\"token punctuation\">.<\/span><span class=\"token function\">getElementById<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;name-input&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">alert<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;\u4f60\u8f93\u5165\u7684\u540d\u5b57\u662f: &#039;<\/span> <span class=\"token operator\">&#043;<\/span> input<span class=\"token punctuation\">.<\/span>value<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><\/p>\n<p><span class=\"token comment\">\/\/ \u793a\u4f8b2&#xff1a;\u52a8\u6001\u66f4\u65b0\u8f93\u5165\u53cd\u9988<\/span><br \/>\n<span class=\"token keyword\">let<\/span> textInput <span class=\"token operator\">&#061;<\/span> document<span class=\"token punctuation\">.<\/span><span class=\"token function\">getElementById<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;text-input&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">let<\/span> feedback <span class=\"token operator\">&#061;<\/span> document<span class=\"token punctuation\">.<\/span><span class=\"token function\">getElementById<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;feedback&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\ntextInput<span class=\"token punctuation\">.<\/span><span class=\"token function\">addEventListener<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;input&#039;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">function<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    feedback<span class=\"token punctuation\">.<\/span>textContent <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#039;\u4f60\u6b63\u5728\u8f93\u5165: &#039;<\/span> <span class=\"token operator\">&#043;<\/span> <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>value<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h3>5. \u904d\u5386DOM<\/h3>\n<p>\u5143\u7d20\u7684\u4e24\u4e2a\u5c5e\u6027&#xff1a; \u25cf \u83b7\u53d6\u6240\u6709\u7684\u5b50\u5143\u7d20&#xff1a;element.children \u25cf \u83b7\u53d6\u5f53\u524d\u5143\u7d20\u7684\u7236\u5143\u7d20&#xff1a;element.parentNode<\/p>\n<p><span class=\"token operator\">&lt;<\/span><span class=\"token operator\">!<\/span><span class=\"token constant\">DOCTYPE<\/span> html<span class=\"token operator\">&gt;<\/span><br \/>\n<span class=\"token operator\">&lt;<\/span>html lang<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;zh-CN&#034;<\/span><span class=\"token operator\">&gt;<\/span><br \/>\n  <span class=\"token operator\">&lt;<\/span>head<span class=\"token operator\">&gt;<\/span><br \/>\n    <span class=\"token operator\">&lt;<\/span>meta charset<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;UTF-8&#034;<\/span><span class=\"token operator\">&gt;<\/span><br \/>\n    <span class=\"token operator\">&lt;<\/span>meta name<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;viewport&#034;<\/span> content<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;width&#061;device-width, initial-scale&#061;1.0&#034;<\/span><span class=\"token operator\">&gt;<\/span><br \/>\n    <span class=\"token operator\">&lt;<\/span>title<span class=\"token operator\">&gt;<\/span><span class=\"token constant\">DOM<\/span>\u5143\u7d20\u904d\u5386\u4e0e\u7236\u5143\u7d20\u67e5\u627e\u793a\u4f8b<span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>title<span class=\"token operator\">&gt;<\/span><br \/>\n  <span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>head<span class=\"token operator\">&gt;<\/span><br \/>\n  <span class=\"token operator\">&lt;<\/span>body<span class=\"token operator\">&gt;<\/span><br \/>\n    <span class=\"token operator\">&lt;<\/span><span class=\"token operator\">!<\/span><span class=\"token operator\">&#8212;<\/span> \u793a\u4f8b<span class=\"token number\">1<\/span>&#xff1a;\u904d\u5386\u5b50\u5143\u7d20 <span class=\"token operator\">&#8212;<\/span><span class=\"token operator\">&gt;<\/span><br \/>\n    <span class=\"token operator\">&lt;<\/span>h2<span class=\"token operator\">&gt;<\/span>\u904d\u5386\u5b50\u5143\u7d20\u793a\u4f8b<span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>h2<span class=\"token operator\">&gt;<\/span><br \/>\n    <span class=\"token operator\">&lt;<\/span>ul id<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;my-list&#034;<\/span><span class=\"token operator\">&gt;<\/span><br \/>\n      <span class=\"token operator\">&lt;<\/span>li<span class=\"token operator\">&gt;<\/span>\u9879\u76ee <span class=\"token number\">1<\/span><span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>li<span class=\"token operator\">&gt;<\/span><br \/>\n      <span class=\"token operator\">&lt;<\/span>li<span class=\"token operator\">&gt;<\/span>\u9879\u76ee <span class=\"token number\">2<\/span><span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>li<span class=\"token operator\">&gt;<\/span><br \/>\n      <span class=\"token operator\">&lt;<\/span>li<span class=\"token operator\">&gt;<\/span>\u9879\u76ee <span class=\"token number\">3<\/span><span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>li<span class=\"token operator\">&gt;<\/span><br \/>\n      <span class=\"token operator\">&lt;<\/span>li<span class=\"token operator\">&gt;<\/span>\u9879\u76ee <span class=\"token number\">4<\/span><span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>li<span class=\"token operator\">&gt;<\/span><br \/>\n    <span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>ul<span class=\"token operator\">&gt;<\/span><\/p>\n<p>    <span class=\"token operator\">&lt;<\/span><span class=\"token operator\">!<\/span><span class=\"token operator\">&#8212;<\/span> \u793a\u4f8b<span class=\"token number\">2<\/span>&#xff1a;\u67e5\u627e\u7236\u5143\u7d20 <span class=\"token operator\">&#8212;<\/span><span class=\"token operator\">&gt;<\/span><br \/>\n    <span class=\"token operator\">&lt;<\/span>h2<span class=\"token operator\">&gt;<\/span>\u67e5\u627e\u7236\u5143\u7d20\u793a\u4f8b<span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>h2<span class=\"token operator\">&gt;<\/span><br \/>\n    <span class=\"token operator\">&lt;<\/span>div id<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;parent-element&#034;<\/span><span class=\"token operator\">&gt;<\/span><br \/>\n      <span class=\"token operator\">&lt;<\/span>p<span class=\"token operator\">&gt;<\/span>\u8fd9\u662f\u4e00\u4e2a\u7236\u5143\u7d20<span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>p<span class=\"token operator\">&gt;<\/span><br \/>\n      <span class=\"token operator\">&lt;<\/span>div id<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;child-element&#034;<\/span><span class=\"token operator\">&gt;<\/span>\u8fd9\u662f\u4e00\u4e2a\u5b50\u5143\u7d20&#xff0c;\u70b9\u51fb\u6211\u4f1a\u9ad8\u4eae\u7236\u5143\u7d20<span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>div<span class=\"token operator\">&gt;<\/span><br \/>\n    <span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>div<span class=\"token operator\">&gt;<\/span><\/p>\n<p>    <span class=\"token operator\">&lt;<\/span>script<span class=\"token operator\">&gt;<\/span><br \/>\n      <span class=\"token comment\">\/\/ \u793a\u4f8b1&#xff1a;\u904d\u5386\u5b50\u5143\u7d20<\/span><br \/>\n      <span class=\"token keyword\">let<\/span> list <span class=\"token operator\">&#061;<\/span> document<span class=\"token punctuation\">.<\/span><span class=\"token function\">getElementById<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;my-list&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n      <span class=\"token keyword\">let<\/span> items <span class=\"token operator\">&#061;<\/span> list<span class=\"token punctuation\">.<\/span>children<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\">&#034;\u904d\u5386\u5b50\u5143\u7d20:&#034;<\/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\">let<\/span> item <span class=\"token keyword\">of<\/span> items<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>item<span class=\"token punctuation\">.<\/span>textContent<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u4e3a\u6bcf\u4e2a\u9879\u76ee\u6dfb\u52a0\u6837\u5f0f<\/span><br \/>\n        item<span class=\"token punctuation\">.<\/span>style<span class=\"token punctuation\">.<\/span>color <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#039;blue&#039;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n      <span class=\"token punctuation\">}<\/span><\/p>\n<p>      <span class=\"token comment\">\/\/ \u793a\u4f8b2&#xff1a;\u67e5\u627e\u7236\u5143\u7d20<\/span><br \/>\n      <span class=\"token keyword\">let<\/span> child <span class=\"token operator\">&#061;<\/span> document<span class=\"token punctuation\">.<\/span><span class=\"token function\">getElementById<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;child-element&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>      <span class=\"token comment\">\/\/ \u6dfb\u52a0\u70b9\u51fb\u4e8b\u4ef6<\/span><br \/>\n      child<span class=\"token punctuation\">.<\/span><span class=\"token function\">addEventListener<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;click&#039;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">function<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">let<\/span> parent <span class=\"token operator\">&#061;<\/span> child<span class=\"token punctuation\">.<\/span>parentNode<span class=\"token punctuation\">;<\/span><br \/>\n        parent<span class=\"token punctuation\">.<\/span>style<span class=\"token punctuation\">.<\/span>border <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#039;2px solid red&#039;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        parent<span class=\"token punctuation\">.<\/span>style<span class=\"token punctuation\">.<\/span>padding <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#039;10px&#039;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        parent<span class=\"token punctuation\">.<\/span>style<span class=\"token punctuation\">.<\/span>backgroundColor <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#039;#f0f0f0&#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\">&#034;\u7236\u5143\u7d20ID:&#034;<\/span><span class=\"token punctuation\">,<\/span> parent<span class=\"token punctuation\">.<\/span>id<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 operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>script<span class=\"token operator\">&gt;<\/span><br \/>\n  <span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>body<span class=\"token operator\">&gt;<\/span><br \/>\n<span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>html<span class=\"token operator\">&gt;<\/span><\/p>\n<h3>6. \u5143\u7d20\u7684\u4e09\u4e2a\u65b9\u6cd5&#xff1a;<\/h3>\n<p>\u25cf \u83b7\u53d6\u5c5e\u6027\u503c&#xff1a;\u5c5e\u6027\u503c &#061; element.getAttribute(\u201c\u5c5e\u6027\u540d\u201d) \u25cf \u8bbe\u7f6e\u5c5e\u6027\u503c&#xff1a;element.setAttribute(\u201c\u5c5e\u6027\u540d\u201d, \u201c\u5c5e\u6027\u503c\u201d) \u25cf \u5224\u65ad\u662f\u5426\u5b58\u5728\u67d0\u5c5e\u6027&#xff1a;element.hasAttribute(\u201c\u5c5e\u6027\u540d\u201d)<\/p>\n<p><span class=\"token doctype\"><span class=\"token punctuation\">&lt;!<\/span><span class=\"token doctype-tag\">DOCTYPE<\/span> <span class=\"token name\">html<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>html<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n  <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>head<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>title<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>DOM\u5c5e\u6027\u64cd\u4f5c\u793a\u4f8b<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>title<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n  <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>head<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n  <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>body<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token comment\">&lt;!&#8211; \u793a\u4f8b\u5143\u7d20 &#8211;&gt;<\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>img<\/span> <span class=\"token attr-name\">id<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>my-image<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">src<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>placeholder.jpg<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>a<\/span> <span class=\"token attr-name\">id<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>my-link<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">href<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>https:\/\/example.com<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">target<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>_blank<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\u793a\u4f8b\u94fe\u63a5<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>a<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<p>    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>script<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token script\"><span class=\"token language-javascript\"><br \/>\n      <span class=\"token comment\">\/\/ \u793a\u4f8b1&#xff1a;\u83b7\u53d6\u548c\u8bbe\u7f6e\u5c5e\u6027<\/span><br \/>\n      <span class=\"token keyword\">let<\/span> image <span class=\"token operator\">&#061;<\/span> document<span class=\"token punctuation\">.<\/span><span class=\"token function\">getElementById<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;my-image&#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;\u539fsrc:&#039;<\/span><span class=\"token punctuation\">,<\/span> image<span class=\"token punctuation\">.<\/span><span class=\"token function\">getAttribute<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;src&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>      image<span class=\"token punctuation\">.<\/span><span class=\"token function\">setAttribute<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;alt&#039;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#039;\u8fd9\u662f\u4e00\u5f20\u56fe\u7247\u63cf\u8ff0&#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;\u65b0alt:&#039;<\/span><span class=\"token punctuation\">,<\/span> image<span class=\"token punctuation\">.<\/span><span class=\"token function\">getAttribute<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;alt&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>      <span class=\"token comment\">\/\/ \u793a\u4f8b2&#xff1a;\u68c0\u67e5\u662f\u5426\u6709\u67d0\u5c5e\u6027<\/span><br \/>\n      <span class=\"token keyword\">let<\/span> link <span class=\"token operator\">&#061;<\/span> document<span class=\"token punctuation\">.<\/span><span class=\"token function\">getElementById<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;my-link&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n      <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>link<span class=\"token punctuation\">.<\/span><span class=\"token function\">hasAttribute<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;target&#039;<\/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 string\">&#039;\u8fd9\u4e2a\u94fe\u63a5\u6709target\u5c5e\u6027&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n      <span class=\"token punctuation\">}<\/span><\/p>\n<p>      <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>link<span class=\"token punctuation\">.<\/span><span class=\"token function\">hasAttribute<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;title&#039;<\/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 string\">&#039;\u8fd9\u4e2a\u94fe\u63a5\u6ca1\u6709title\u5c5e\u6027&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n      <span class=\"token punctuation\">}<\/span><br \/>\n    <\/span><\/span><span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>script<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n  <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>body<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>html<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<h3>7. \u52a8\u6001\u5217\u8868\u64cd\u4f5c<\/h3>\n<p>\u5143\u7d20\u7684\u4e00\u4e2a\u65b9\u6cd5&#xff1a; \u25cf \u5220\u9664\u5f53\u524d\u5143\u7d20&#xff1a;element.remove()<\/p>\n<p><span class=\"token operator\">&lt;<\/span><span class=\"token operator\">!<\/span><span class=\"token constant\">DOCTYPE<\/span> html<span class=\"token operator\">&gt;<\/span><br \/>\n<span class=\"token operator\">&lt;<\/span>html<span class=\"token operator\">&gt;<\/span><br \/>\n<span class=\"token operator\">&lt;<\/span>body<span class=\"token operator\">&gt;<\/span><br \/>\n    <span class=\"token operator\">&lt;<\/span>button id<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;btn&#034;<\/span><span class=\"token operator\">&gt;<\/span>\u5143\u7d20<span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>button<span class=\"token operator\">&gt;<\/span><br \/>\n    <span class=\"token operator\">&lt;<\/span>script<span class=\"token operator\">&gt;<\/span><br \/>\n        document<span class=\"token punctuation\">.<\/span><span class=\"token function\">addEventListener<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;DOMContentLoaded&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">function<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n          document<span class=\"token punctuation\">.<\/span><span class=\"token function\">querySelector<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;#btn&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">addEventListener<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;click&#039;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">function<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">e<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n            e<span class=\"token punctuation\">.<\/span>target<span class=\"token punctuation\">.<\/span><span class=\"token function\">remove<\/span><span class=\"token punctuation\">(<\/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><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>script<span class=\"token operator\">&gt;<\/span><br \/>\n<span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>body<span class=\"token operator\">&gt;<\/span><br \/>\n<span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>html<span class=\"token operator\">&gt;<\/span><\/p>\n<h3>8. \u7b80\u5355\u7684DOM\u52a8\u753b<\/h3>\n<p>\u79fb\u52a8\u5143\u7d20\u7684\u8bdd\u5c31\u662f\u4e0d\u65ad\u8bbe\u7f6e left\/right\/top\/bottom\u7684\u6837\u5f0f&#xff0c;\u4f46 position\u5c5e\u6027\u9700\u8981\u8bbe\u7f6e\u4e3a relative \u6de1\u5165\u6de1\u51fa\u7684\u6548\u679c\u4e3b\u8981\u662f\u6539\u53d8\u5143\u7d20 opacity\u7684\u6837\u5f0f\u3002<\/p>\n<p><span class=\"token operator\">&lt;<\/span><span class=\"token operator\">!<\/span><span class=\"token constant\">DOCTYPE<\/span> html<span class=\"token operator\">&gt;<\/span><br \/>\n<span class=\"token operator\">&lt;<\/span>html<span class=\"token operator\">&gt;<\/span><br \/>\n  <span class=\"token operator\">&lt;<\/span>style<span class=\"token operator\">&gt;<\/span><br \/>\n    <span class=\"token punctuation\">.<\/span>box<span class=\"token punctuation\">{<\/span><br \/>\n      <span class=\"token literal-property property\">position<\/span><span class=\"token operator\">:<\/span>relative<span class=\"token punctuation\">;<\/span><br \/>\n      <span class=\"token literal-property property\">width<\/span><span class=\"token operator\">:<\/span> 100px<span class=\"token punctuation\">;<\/span><br \/>\n      <span class=\"token literal-property property\">height<\/span><span class=\"token operator\">:<\/span> 100px<span class=\"token punctuation\">;<\/span><br \/>\n      background<span class=\"token operator\">&#8211;<\/span>color<span class=\"token operator\">:<\/span> black<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n  <span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>style<span class=\"token operator\">&gt;<\/span><br \/>\n<span class=\"token operator\">&lt;<\/span>body<span class=\"token operator\">&gt;<\/span><br \/>\n    <span class=\"token operator\">&lt;<\/span>button id<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;btn1&#034;<\/span><span class=\"token operator\">&gt;<\/span>\u79fb\u52a8<span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>button<span class=\"token operator\">&gt;<\/span><br \/>\n    <span class=\"token operator\">&lt;<\/span>div id<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;box1&#034;<\/span> <span class=\"token keyword\">class<\/span><span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;box&#034;<\/span><span class=\"token operator\">&gt;<\/span><span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>div<span class=\"token operator\">&gt;<\/span><\/p>\n<p>    <span class=\"token operator\">&lt;<\/span>button id<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;btn2&#034;<\/span><span class=\"token operator\">&gt;<\/span>\u6de1\u5165\u6de1\u51fa<span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>button<span class=\"token operator\">&gt;<\/span><br \/>\n    <span class=\"token operator\">&lt;<\/span>div id<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;box2&#034;<\/span> <span class=\"token keyword\">class<\/span><span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;box&#034;<\/span><span class=\"token operator\">&gt;<\/span><span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>div<span class=\"token operator\">&gt;<\/span><\/p>\n<p>    <span class=\"token operator\">&lt;<\/span>script<span class=\"token operator\">&gt;<\/span><br \/>\n        <span class=\"token keyword\">let<\/span> btn1 <span class=\"token operator\">&#061;<\/span> document<span class=\"token punctuation\">.<\/span><span class=\"token function\">getElementById<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;btn1&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">let<\/span> box1 <span class=\"token operator\">&#061;<\/span> document<span class=\"token punctuation\">.<\/span><span class=\"token function\">getElementById<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;box1&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">let<\/span> pos <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        btn1<span class=\"token punctuation\">.<\/span><span class=\"token function\">addEventListener<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;click&#039;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">function<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            pos <span class=\"token operator\">&#043;&#061;<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token comment\">\/\/ \u8981\u5b9e\u73b0\u8fd9\u4e2a\u529f\u80fd&#xff0c;box\u7684css\u6837\u5f0f\u4e2d\u5fc5\u987b\u6307\u5b9a\u4e86 position \u6837\u5f0f&#xff0c;\u4f8b\u5982&#xff1a;position:relative;<\/span><br \/>\n            box1<span class=\"token punctuation\">.<\/span>style<span class=\"token punctuation\">.<\/span>left <span class=\"token operator\">&#061;<\/span> pos <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#039;px&#039;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token keyword\">let<\/span> btn2 <span class=\"token operator\">&#061;<\/span> document<span class=\"token punctuation\">.<\/span><span class=\"token function\">getElementById<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;btn2&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">let<\/span> box2 <span class=\"token operator\">&#061;<\/span> document<span class=\"token punctuation\">.<\/span><span class=\"token function\">getElementById<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;box2&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">let<\/span> op <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        btn2<span class=\"token punctuation\">.<\/span><span class=\"token function\">addEventListener<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;click&#039;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">function<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            op <span class=\"token operator\">&#061;<\/span> op <span class=\"token operator\">&#061;&#061;&#061;<\/span> <span class=\"token number\">1<\/span> <span class=\"token operator\">?<\/span> <span class=\"token number\">0.3<\/span> <span class=\"token operator\">:<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            box2<span class=\"token punctuation\">.<\/span>style<span class=\"token punctuation\">.<\/span>opacity <span class=\"token operator\">&#061;<\/span> op<span class=\"token punctuation\">;<\/span><\/p>\n<p>            <span class=\"token comment\">\/\/ \u8bbe\u7f6e CSS \u8fc7\u6e21\u6548\u679c&#xff0c;\u8ba9\u5143\u7d20\u5c5e\u6027\u53d8\u5316\u65f6\u4ea7\u751f\u52a8\u753b\u6e10\u53d8&#xff0c;\u800c\u4e0d\u662f\u77ac\u95f4\u53d8\u5316\u3002<\/span><br \/>\n            <span class=\"token comment\">\/\/ \u8ba9\u5143\u7d20\u7684 opacity&#xff08;\u900f\u660e\u5ea6&#xff09;\u5c5e\u6027\u5728\u53d1\u751f\u53d8\u5316\u65f6&#xff0c;\u4ee5 0.5 \u79d2\u7684\u65f6\u95f4\u5e73\u6ed1\u8fc7\u6e21&#xff08;\u800c\u4e0d\u662f\u77ac\u95f4\u53d8\u5316&#xff09;\u3002<\/span><br \/>\n            box2<span class=\"token punctuation\">.<\/span>style<span class=\"token punctuation\">.<\/span>transition <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#039;opacity 0.5s&#039;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span 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