{"id":103506,"date":"2026-09-10T19:41:12","date_gmt":"2026-09-10T11:41:12","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/103506.html"},"modified":"2026-09-10T19:41:12","modified_gmt":"2026-09-10T11:41:12","slug":"js%e6%ad%a3%e5%88%99%e5%af%b9%e8%b1%a1%e4%b8%8e%e5%9f%ba%e7%a1%80%e8%ae%b2%e8%a7%a3","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/103506.html","title":{"rendered":"js\u6b63\u5219\u5bf9\u8c61\u4e0e\u57fa\u7840\u8bb2\u89e3"},"content":{"rendered":"

JavaScript \u4e2d，\u5185\u7f6e\u5bf9\u8c61\u5c31\u662f JS \u8bed\u8a00\u539f\u751f\u5e2e\u6211\u4eec\u5199\u597d\u7684\u5bf9\u8c61，\u76f4\u63a5\u62ff\u6765\u8c03\u7528\u5c5e\u6027\u3001\u65b9\u6cd5\u5373\u53ef，\u4e0d\u7528\u81ea\u5df1\u4ece\u96f6\u5c01\u88c5\u3002
\n\u6b63\u5219\u8868\u8fbe\u5f0f（RegExp）\u662f JS \u5185\u7f6e\u5bf9\u8c61\u4e4b\u4e00，\u4e13\u95e8\u7528\u6765\u505a\u5b57\u7b26\u4e32\u5339\u914d\u3001\u6821\u9a8c\u3001\u63d0\u53d6\u3001\u66ff\u6362\u3002
\n\u6574\u4f53\u5206\u4e3a\u4e24\u5927\u5757：\u5e38\u7528\u5185\u7f6e\u5bf9\u8c61\u3001\u6b63\u5219\u5bf9\u8c61\u57fa\u7840\u3002<\/p>\n

\u4e00\u3001JS \u5185\u7f6e\u5bf9\u8c61\u603b\u89c8
\nJS \u5185\u7f6e\u5bf9\u8c61\u5206\u4e3a 3 \u5927\u7c7b：
\n\u6570\u636e\u5305\u88c5\u5bf9\u8c61：String\u3001Number\u3001Boolean
\n\u5de5\u5177\u5185\u7f6e\u5bf9\u8c61：Math\u3001Date\u3001Array
\n\u7279\u6b8a\u5185\u7f6e\u5bf9\u8c61：RegExp\u6b63\u5219\u3001JSON\u3001Global(\u5168\u5c40)
\n\u5c0f\u77e5\u8bc6\u70b9：\u539f\u59cb\u503c（\u7b80\u5355\u6570\u636e\u7c7b\u578b）\u4e3a\u4ec0\u4e48\u53ef\u4ee5\u8c03\u7528\u65b9\u6cd5？
\njs
\n\u8fd0\u884c
\nlet str = "hello";
\nconsole.log(str.toUpperCase());
\n\u539f\u7406：JS \u4f1a\u4e34\u65f6\u5305\u88c5，\u628a\u539f\u59cb\u5b57\u7b26\u4e32\u4e34\u65f6\u5305\u88c5\u6210String\u5bf9\u8c61，\u8c03\u7528\u5b8c\u65b9\u6cd5\u7acb\u523b\u9500\u6bc1\u4e34\u65f6\u5bf9\u8c61，\u539f\u59cb\u503c\u672c\u8eab\u4e0d\u53d8\u3002
\n1. String \u5b57\u7b26\u4e32\u5bf9\u8c61
\n\u5b57\u7b26\u4e32\u65b9\u6cd5\u5168\u90e8\u4e0d\u4f1a\u4fee\u6539\u539f\u5b57\u7b26\u4e32，\u53ea\u4f1a\u8fd4\u56de\u65b0\u5b57\u7b26\u4e32！（\u9ad8\u9891\u5751\u70b9）
\n\u8868\u683c
\n\u65b9\u6cd5\u00a0\u00a0 \u00a0\u4f5c\u7528\u00a0\u00a0 \u00a0\u793a\u4f8b
\ncharAt(index)\u00a0\u00a0 \u00a0\u83b7\u53d6\u4e0b\u6807\u5bf9\u5e94\u5b57\u7b26\u00a0\u00a0 \u00a0'abc'.charAt(0) \/\/ 'a'
\nindexOf(\u5b57\u7b26)\u00a0\u00a0 \u00a0\u67e5\u627e\u5b57\u7b26\u4e0b\u6807，\u627e\u4e0d\u5230\u8fd4\u56de-1\u00a0\u00a0 \u00a0'abc'.indexOf('b') \/\/1
\nsubstr(start,length)\u00a0\u00a0 \u00a0\u622a\u53d6：\u8d77\u59cb\u4e0b\u6807，\u622a\u53d6\u957f\u5ea6\u00a0\u00a0 \u00a0'abcd'.substr(1,2) \/\/'bc'
\nsubstring(start,end)\u00a0\u00a0 \u00a0\u622a\u53d6：\u5f00\u59cb\u4e0b\u6807，\u7ed3\u675f\u4e0b\u6807（\u4e0d\u5305\u542b end）\u00a0\u00a0 \u00a0'abcd'.substring(1,3) \/\/'bc'
\nsplit('\u5206\u9694\u7b26')\u00a0\u00a0 \u00a0\u5b57\u7b26\u4e32\u5207\u5272\u6210\u6570\u7ec4\u00a0\u00a0 \u00a0'a,b,c'.split(',') \/\/['a','b','c']
\ntoUpperCase()\u00a0\u00a0 \u00a0\u8f6c\u5927\u5199\u00a0\u00a0 \u00a0'hi'.toUpperCase() \/\/'HI'
\ntoLowerCase()\u00a0\u00a0 \u00a0\u8f6c\u5c0f\u5199\u00a0\u00a0 \u00a0'HI'.toLowerCase() \/\/'hi'
\nreplace(old,new)\u00a0\u00a0 \u00a0\u5b57\u7b26\u4e32\u66ff\u6362，\u9ed8\u8ba4\u53ea\u66ff\u6362\u7b2c\u4e00\u4e2a\u5339\u914d\u9879\u00a0\u00a0 \u00a0'aa'.replace('a','x') \/\/'xa'
\n\u6613\u9519：replace\u9ed8\u8ba4\u53ea\u66ff\u6362\u7b2c\u4e00\u4e2a，\u5982\u679c\u8981\u5168\u90e8\u66ff\u6362，\u9700\u8981\u6b63\u5219\u3002
\n2. Number \u6570\u5b57\u5bf9\u8c61
\njs
\n\u8fd0\u884c
\nlet num = 3.1415926;
\n\/\/\u4fdd\u7559\u5c0f\u6570\u4f4d\u6570，\u8fd4\u56de\u5b57\u7b26\u4e32！！
\nnum.toFixed(2) \u00a0\/\/ "3.14"
\nNumber.parseInt()：\u5b57\u7b26\u4e32\u8f6c\u6574\u6570
\nNumber.parseFloat()：\u5b57\u7b26\u4e32\u8f6c\u5c0f\u6570
\nNumber.isNaN() \u5224\u65ad\u662f\u4e0d\u662f NaN
\n3. Math \u6570\u5b66\u5bf9\u8c61（\u9759\u6001\u5bf9\u8c61，\u4e0d\u9700\u8981 new）
\n\u76f4\u63a5Math.xxx()\u8c03\u7528，\u4e0d\u7528\u5b9e\u4f8b\u5316
\njs
\n\u8fd0\u884c
\nMath.PI \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\/\/\u5706\u5468\u7387
\nMath.abs(-5) \u00a0 \u00a0 \/\/\u7edd\u5bf9\u503c 5
\nMath.ceil(2.1) \u00a0 \/\/\u5411\u4e0a\u53d6\u6574 3
\nMath.floor(2.9) \u00a0\/\/\u5411\u4e0b\u53d6\u6574 2
\nMath.round(2.5) \u00a0\/\/\u56db\u820d\u4e94\u5165 3
\nMath.random() \u00a0 \u00a0\/\/\u8fd4\u56de [0,1) \u968f\u673a\u5c0f\u6570
\n\u7ecf\u5178\u968f\u673a\u6574\u6570\u516c\u5f0f：
\njs
\n\u8fd0\u884c
\n\/\/ \u83b7\u53d6 min ~ max \u7684\u968f\u673a\u6574\u6570
\nfunction getRandom(min,max){
\n\u00a0 return Math.floor(Math.random()*(max-min+1)) + min;
\n}
\n4. Date \u65e5\u671f\u5bf9\u8c61
\n\u9700\u8981 new \u5b9e\u4f8b\u5316，\u7528\u6765\u5904\u7406\u65f6\u95f4\u3002
\njs
\n\u8fd0\u884c
\n\/\/\u83b7\u53d6\u5f53\u524d\u65f6\u95f4
\nlet d = new Date();<\/p>\n

d.getFullYear() \u00a0 \/\/\u5e74
\nd.getMonth() \u00a0 \u00a0 \u00a0\/\/\u6708 0~11！！0\u4ee3\u88681\u6708，\u5751！
\nd.getDate() \u00a0 \u00a0 \u00a0 \/\/\u65e5
\nd.getDay() \u00a0 \u00a0 \u00a0 \u00a0\/\/\u661f\u671f 0\u662f\u5468\u65e5
\nd.getHours() \u00a0 \u00a0 \u00a0\/\/\u65f6
\nd.getMinutes() \u00a0 \u00a0\/\/\u5206
\nd.getSeconds() \u00a0 \u00a0\/\/\u79d2<\/p>\n

d.getTime() \u00a0 \u00a0 \u00a0 \/\/\u65f6\u95f4\u6233，\u6beb\u79d2
\n5. Array \u6570\u7ec4\u5bf9\u8c61
\n\u6570\u7ec4\u65b9\u6cd5\u5206\u4e24\u7c7b：\u6539\u53d8\u539f\u6570\u7ec4\u3001\u4e0d\u6539\u53d8\u539f\u6570\u7ec4
\n1.\u6539\u53d8\u539f\u6570\u7ec4
\npush\u3001pop\u3001shift\u3001unshift\u3001splice()\u3001sort()\u3001reverse()
\n2.\u4e0d\u6539\u53d8\u539f\u6570\u7ec4，\u8fd4\u56de\u65b0\u6570\u7ec4
\nmap\u3001filter\u3001concat\u3001slice(start,end)
\njs
\n\u8fd0\u884c
\nlet arr = [1,2,3,4];
\narr.slice(1,3) \/\/ [2,3] \u622a\u53d6，\u4e0d\u4fee\u6539\u539f\u6570\u7ec4
\n6. JSON \u5bf9\u8c61
\nJSON\u7528\u4e8e json \u5b57\u7b26\u4e32\u4e0e JS \u5bf9\u8c61\u4e92\u8f6c
\njs
\n\u8fd0\u884c
\n\/\/JS\u5bf9\u8c61 \u2192 JSON\u5b57\u7b26\u4e32
\nJSON.stringify({name:'\u5f20\u4e09'})<\/p>\n

\/\/JSON\u5b57\u7b26\u4e32 \u2192 JS\u5bf9\u8c61
\nJSON.parse('{"name":"\u5f20\u4e09"}')
\n\u4e8c\u3001RegExp \u6b63\u5219\u8868\u8fbe\u5f0f\u5185\u7f6e\u5bf9\u8c61
\nRegExp \u662f JS \u4e13\u95e8\u5904\u7406\u6a21\u5f0f\u5339\u914d\u7684\u5185\u7f6e\u5bf9\u8c61\u3002
\n\u4e24\u79cd\u521b\u5efa\u6b63\u5219\u7684\u65b9\u5f0f
\n\u65b9\u5f0f 1：\u5b57\u9762\u91cf（\u5f00\u53d1\u6700\u5e38\u7528）
\njs
\n\u8fd0\u884c
\n\/\/ \/\u6b63\u5219\u8868\u8fbe\u5f0f\/\u4fee\u9970\u7b26
\nlet reg = \/a\/;
\n\u65b9\u5f0f 2：new RegExp () \u6784\u9020\u51fd\u6570（\u5185\u7f6e\u5bf9\u8c61\u6807\u51c6\u5199\u6cd5）
\njs
\n\u8fd0\u884c
\nlet reg = new RegExp("a");
\n\/\/\u9002\u5408\u6b63\u5219\u5185\u5bb9\u662f\u53d8\u91cf\u7684\u573a\u666f
\nlet str = "hello";
\nlet reg2 = new RegExp(str);<\/p>\n","protected":false},"excerpt":{"rendered":"

JavaScript \u4e2d，\u5185\u7f6e\u5bf9\u8c61\u5c31\u662f JS \u8bed\u8a00\u539f\u751f\u5e2e\u6211\u4eec\u5199\u597d\u7684\u5bf9\u8c61，\u76f4\u63a5\u62ff\u6765\u8c03\u7528\u5c5e\u6027\u3001\u65b9\u6cd5\u5373\u53ef，\u4e0d\u7528\u81ea\u5df1\u4ece\u96f6\u5c01\u88c5\u3002
\n\u6b63\u5219\u8868\u8fbe\u5f0f（RegExp）\u662f JS \u5185\u7f6e\u5bf9\u8c61\u4e4b\u4e00，\u4e13\u95e8\u7528\u6765\u505a\u5b57\u7b26\u4e32\u5339\u914d\u3001\u6821\u9a8c\u3001\u63d0\u53d6\u3001\u66ff\u6362\u3002
\n\u6574\u4f53\u5206\u4e3a\u4e24\u5927\u5757：\u5e38\u7528\u5185\u7f6e\u5bf9\u8c61\u3001\u6b63\u5219\u5bf9\u8c61\u57fa\u7840\u3002\u4e00\u3001JS \u5185\u7f6e\u5bf9\u8c61\u603b\u89c8
\nJS \u5185\u7f6e\u5bf9\u8c61\u5206\u4e3a 3 \u5927\u7c7b：
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