{"id":271,"date":"2020-02-07T20:58:27","date_gmt":"2020-02-07T12:58:27","guid":{"rendered":"https:\/\/www.notown.club\/?p=271"},"modified":"2020-04-05T22:30:41","modified_gmt":"2020-04-05T14:30:41","slug":"javascript%e7%b3%bb%e7%bb%9f%e5%87%bd%e6%95%b0","status":"publish","type":"post","link":"https:\/\/www.notown.top\/?p=271","title":{"rendered":"JavaScript\u7cfb\u7edf\u51fd\u6570"},"content":{"rendered":"\n<p>JavaScript\u7cfb\u7edf\u51fd\u6570\u4e00\u822c\u53ef\u5206\u4e3a\u5e38\u89c4\u51fd\u6570\u3001\u5b57\u7b26\u4e32\u51fd\u6570\u3001\u6570\u5b66\u51fd\u6570\u3001\u6570\u7ec4\u51fd\u6570\u548c\u65e5\u671f\u51fd\u6570\u7b49\u4e94\u5927\u7c7b\u3002<\/p>\n\n\n\n<p>\u4e00\u3001\u5e38\u89c4\u51fd\u6570<br>    1\u3001<strong>alert\u51fd\u6570<\/strong>\uff1a\u663e\u793a\u4e00\u4e2a\u8b66\u544a\u5bf9\u8bdd\u6846\uff0c\u5305\u62ec\u4e00\u4e2aOK\u6309\u94ae\uff1b<br>    2\u3001<strong>confirm\u51fd\u6570<\/strong>\uff1a\u663e\u793a\u4e00\u4e2a\u786e\u8ba4\u5bf9\u8bdd\u6846\uff0c\u5305\u62ecOK\u548ccancel\u6309\u94ae\uff1b<br>          \u70b9\u51fb\u786e\u8ba4\u56de\u8fd4\u56detrue\uff0c\u53d6\u6d88\u8fd4\u56defalse<br>    3\u3001<strong>prompt\u51fd\u6570<\/strong>\uff1a\u663e\u793a\u4e00\u4e2a\u8f93\u5165\u5bf9\u8bdd\u6846\uff0c\u63d0\u793a\u7b49\u5f85\u7528\u6237\u8f93\u5165\uff1b<br>    4\u3001<strong>eval\u51fd\u6570<\/strong>\uff1a\u8ba1\u7b97\u5b57\u7b26\u4e32\u7684\u7ed3\u679c\uff0c\u6267\u884cJavaScript\u811a\u672c\u4ee3\u7801\uff1b<br>    5\u3001<strong>parseInt\u51fd\u6570<\/strong>\uff1a\u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u6210\u6574\u6570\u5f62\u5f0f\uff1b<br>    6\u3001<strong>parsefloat\u51fd\u6570<\/strong>\uff1a\u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u6210\u6d6e\u70b9\u5c0f\u6570\u5f62\u5f0f<br>    7\u3001<strong>isNaN\u51fd\u6570<\/strong>\uff1a\u5224\u65ad\u662f\u5426\u4e3a\u975e\u6570\u5b57<br>&#8230;<\/p>\n\n\n\n<p>\u4e8c\u3001\u5b57\u7b26\u4e32\u51fd\u6570<br>     1\u3001<strong>charAt\u51fd\u6570<\/strong>\uff1a\u8fd4\u56de\u5b57\u7b26\u4e32\u4e2d\u6307\u5b9a\u7684\u67d0\u4e2a\u5b57\u7b26<br>           \u4f8b\uff1a<code>stringObject.charAt(index)<\/code>             \/\/\u8fd4\u56de\u7d22\u5f15\u503c\u6307\u5b9a\u7684\u5b57\u7b26<br>     2\u3001<strong>indexOf\u51fd\u6570<\/strong>\uff1a\u8fd4\u56de\u5728\u67d0\u4e2a\u6307\u5b9a\u7684\u5b57\u7b26\u4e32\u503c\u5728\u5b57\u7b26\u4e32\u4e2d\u9996\u6b21\u51fa\u73b0\u7684\u4f4d\u7f6e<br>           \u4f8b\uff1a<code>stringObject.indexOf(searchvalue,fromindex)<\/code><br>           searchvalue\u662f\u5fc5\u987b\u53c2\u6570\uff0c\u8868\u793a\u9700\u8981\u68c0\u7d22\u7684\u5b57\u7b26\u4e32\u503c\uff0cfromindex\u53c2\u6570\u662f\u53ef         <br>           \u9009\u53c2\u6570\uff0c\u8868\u793a\u5f00\u59cb\u68c0\u7d22\u7684\u4f4d\u7f6e\uff0c\u5408\u6cd5\u53d6\u503c\u8303\u56f4\u4e3a0~stringObject.lenth-1\u3002<br>           \u5982\u679c\u4e0d\u586b\u5219\uff0c\u9ed8\u8ba4\u4ece0\u5f00\u59cb\u68c0\u7d22<br>     3\u3001<strong>lastIndexOf\u51fd\u6570<\/strong>\uff1a\u8fd4\u56de\u5b57\u7b26\u4e32\u4e2d\u67d0\u4e2a\u6307\u5b9a\u5b57\u7b26\u4e32\u503c\u5728\u5b57\u7b26\u4e32\u4e2d\u6700\u540e\u51fa\u73b0\u7684<br>           \u4f4d\u7f6e<br>           \u4f8b\uff1a <code>stringObject.lastindexOf(searchvalue,fromindex) <\/code><br>           \/\/\u53c2\u6570\u89e3\u91ca\u540c\u7b2c\u4e8c\u4e2a\uff0c\u4f46 fromindex \u5982\u679c\u4e0d\u586b\uff0c\u5219\u9ed8\u8ba4\u4ece\u6700\u540e\u4e00\u4e2a\u4f4d\u7f6e\u5f00\u59cb<br>           \u5f00\u59cb\u68c0\u7d22<br>     4\u3001<strong>lenth\u51fd\u6570<\/strong>\uff1a\u8fd4\u56de\u5b57\u7b26\u4e32\u957f\u5ea6<br>     5\u3001<strong>substring\u51fd\u6570<\/strong>\uff1a\u8fd4\u56de\u5b57\u7b26\u4e32\u4e2d\u6307\u5b9a\u7684\u51e0\u4e2a\u5b57\u7b26<br>            \u4f8b\uff1a<code>stringObject.substring(start,stop)<\/code>\/\/\u7528\u4e8e\u63d0\u53d6\u5b57\u7b26\u4e32\u4e2d\u4ecb\u4e8e\u4e24\u4e2a\u6307\u5b9a<br>            \u4e0b\u6807\u4e4b\u95f4\u7684\u5b57\u7b26\uff0cstart\u5fc5\u9009\u53c2\u6570\uff0c\u53ea\u80fd\u53d6\u6b63\uff0cstop\u53ef\u9009\u53c2\u6570\uff08stop\u8981\u6bd4\u6240<br>             \u63d0\u53d6\u7684\u5b57\u4e32\u7684\u672b\u4f4d\u518d+1\uff09<br>     6\u3001<strong>substr\u51fd\u6570<\/strong>\uff1a\u8fd4\u56de\u5b57\u7b26\u4e32\u4e2d\u6307\u5b9a\u7684\u51e0\u4e2a\u5b57\u7b26<br>           \u4f8b\uff1a<code>stringObject.substr(start,length)<\/code><br>           \/\/\u5728\u5b57\u7b26\u4e32\u4e2d\u62bd\u53d6start\u4e0b\u6807\u5f00\u59cb\u7684\u6307\u5b9a\u957f\u5ea6\u7684\u5b57\u7b26\u4e32<br>           \/\/start\u53ef\u8d1f\uff0c-1\u8868\u6700\u540e\u4e00\u4e2a\uff0c-2\u8868\u5012\u6570\u7b2c\u4e8c\u4e2a<br>           \/\/length\u53c2\u6570\u82e5\u7701\u7565\uff0c\u5219\u8fd4\u56de\u4ecestart\u5230\u7ed3\u5c3e\u7684\u5b57\u7b26\u4e32<br>     7\u3001<strong>toLowerCase\u51fd\u6570<\/strong>\uff1a\u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u5c0f\u5199\u3002<br>     8\u3001<strong>toUpperCase\u51fd\u6570<\/strong>\uff1a\u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u5927\u5199\u3002<br>     9\u3001<strong>concat\u51fd\u6570<\/strong>\uff1a\u62fc\u63a5\u4e24\u4e2a\u5b57\u7b26\u4e32<br>           \u4f8b\uff1a<code>str1.concat(str2)<\/code>\uff0c\u8fd4\u56de\u62fc\u63a5\u597d\u7684\u5b57\u7b26\u4e32<br>     10\u3001<strong>replace\u51fd\u6570<\/strong>\uff1a\u66ff\u6362\u5b57\u7b26\u4e32\u4e2d\u7684\u67d0\u90e8\u5206\u5b57\u7b26\u4e32<br>            \u4f8b\uff1a<code>str.replace(\/\u539f\u5b57\u7b26\u4e32\/,\"\u66ff\u6362\u6210\u7684\u5b57\u7b26\u4e32\")<\/code>\uff0c\u8fd4\u56de\u66ff\u6362\u540e\u7684\u5b57\u7b26\u4e32<br>     11\u3001<strong>slice\u51fd\u6570<\/strong>\uff1a\u8fd4\u56de\u6307\u5b9a\u4e0b\u6807\u4f4d\u7f6e\u4e4b\u95f4\u7684\u5b57\u7b26\u5185\u5bb9\uff0c\u529f\u80fd\u540csubstring<br>             \u4f8b\uff1a<code>str.slice(start,stop)<\/code><br>     12\u3001<strong>split\u51fd\u6570<\/strong>\uff1a\u4ee5\u67d0\u4e00\u5b57\u7b26\u4e32\u4e3a\u6807\u5fd7\u5206\u5272\u6574\u4e2a\u5b57\u7b26\u4e32<br>             \u4f8b\uff1a<code>str.split(\" \")<\/code>\/\/\u6b64\u65f6\uff0c\u5c31\u5c06str\u5b57\u7b26\u4e32\u4e2d\u542b\u6709\u7a7a\u683c\u7684\u90e8\u5206\u65ad\u5f00.<br><\/p>\n\n\n\n<p>\u4e09\u3001\u6570\u5b66\u51fd\u6570<br>     1\u3001<strong>abs\u51fd\u6570<\/strong>\uff1a\u8fd4\u56de\u4e00\u4e2a\u6570\u5b57\u7684\u7edd\u5bf9\u503c\uff1b<br>     2\u3001<strong>acos\u51fd\u6570<\/strong>\uff1a\u8fd4\u56de\u4e00\u4e2a\u6570\u5b57\u7684\u53cd\u4f59\u5f26\u503c\uff0c\u7ed3\u679c\u4e3a0~\u03c0\u7684\u5f27\u5ea6\uff1b<br>     3\u3001<strong>asin\u51fd\u6570<\/strong>\uff1a\u8fd4\u56de\u4e00\u4e2a\u6570\u5b57\u7684\u53cd\u6b63\u5f26\u503c\uff0c\u7ed3\u679c\u4e3a-\u03c0\/2~\u03c0\/2\u7684\u5f27\u5ea6\uff1b<br>     4\u3001<strong>atan\u51fd\u6570<\/strong>\uff1a\u8fd4\u56de\u4e00\u4e2a\u6570\u5b57\u7684\u53cd\u6b63\u5207\u503c\uff0c \u7ed3\u679c\u4e3a-\u03c0\/2~\u03c0\/2\u7684\u5f27\u5ea6\uff1b <br>     5\u3001<strong>ceil\u51fd\u6570<\/strong>\uff1a\u8fd4\u56de\u4e00\u4e2a\u6570\u5b57\u7684\u6700\u5c0f\u6574\u6570\u503c\uff08\u5929\u82b1\u677f\uff09<br>     6\u3001<strong>cos\u51fd\u6570<\/strong>\uff1a\u6c42\u4f59\u5f26<br>     7\u3001<strong>exp\u51fd\u6570<\/strong>\uff1a\u8fd4\u56dee\u7684\u4e58\u65b9\u503c<br>     8\u3001<strong>floor\u51fd\u6570<\/strong>\uff1a\u8fd4\u56de\u4e00\u4e2a\u6570\u5b57\u7684\u6700\u5927\u6574\u6570\u503c\uff08\u5730\u677f\uff09<br>     9\u3001<strong>log\u51fd\u6570<\/strong>\uff1a\u81ea\u7136\u5bf9\u6570\u51fd\u6570\uff0c\u8fd4\u56de\u4e00\u4e2a\u6570\u5b57\u7684\u81ea\u7136\u5bf9\u6570\u503c<br>     10\u3001<strong>max\u51fd\u6570<\/strong>\uff1a\u8fd4\u56de\u4e24\u4e2a\u6570\u7684\u6700\u5927\u503c\uff1b<br>     11\u3001<strong>min\u51fd\u6570<\/strong>\uff1a\u8fd4\u56de\u4e24\u4e2a\u6570\u7684\u6700\u5c0f\u503c\uff1b<br>     12\u3001<strong>pow\u51fd\u6570<\/strong>\uff1a\u8fd4\u56de\u4e00\u4e2a\u6570\u5b57\u7684\u4e58\u65b9\u503c\uff1b<br>     13\u3001<strong>random\u51fd\u6570<\/strong>\uff1a\u8fd4\u56de\u4e00\u4e2a0~1\u7684\u968f\u673a\u6570\u503c\uff1b<br>     14\u3001<strong>round\u51fd\u6570<\/strong>\uff1a\u8fd4\u56de\u4e00\u4e2a\u6570\u5b57\u7684\u56db\u820d\u4e94\u5165\u503c\uff0c\u7c7b\u578b\u662f\u6574\u6570\uff1b<br>     15\u3001<strong>sin\u51fd\u6570<\/strong>\uff1a\u8fd4\u56de\u4e00\u4e2a\u6570\u5b57\u7684\u6b63\u5f26\u503c\uff0c\u7ed3\u679c\u4e3a-1~1\uff1b<br>     16\u3001<strong>sqrt\u51fd\u6570<\/strong>\uff1a\u8fd4\u56de\u4e00\u4e2a\u6570\u5b57\u7684\u5e73\u65b9\u6839\u503c\uff1b<br>     17\u3001<strong>tan\u51fd\u6570<\/strong>\uff1a\u8fd4\u56de\u4e00\u4e2a\u6570\u5b57\u7684\u6b63\u5207\u503c\uff1b<br>&#8230;\uff08\u4ee5\u4e0a\u51fd\u6570\u7686\u5c5e\u4e8emath\u7c7b\u51fd\u6570\uff0c\u8c03\u7528\u65f6\u8981\uff1aMath.function()\uff09<\/p>\n\n\n\n<p>\u56db\u3001\u6570\u7ec4\u51fd\u6570<br>\u00a0\u00a0\u00a0\u00a01\u3001join\u51fd\u6570\uff1a\u8f6c\u6362\u5e76\u8fde\u63a5\u6570\u7ec4\u4e2d\u7684\u6240\u6709\u5143\u7d20\u4e3a\u4e00\u4e2a\u5b57\u7b26\u4e32\uff1b<br>\u00a0\u00a0\u00a0\u00a0\u4f8b\uff1a<code>arrayObject.join(separator)<\/code><br>\u00a0\u00a0\u00a0\u00a0 \/\/separator\u4e3a\u53ef\u9009\u53c2\u6570\uff0c\u8868\u793a\u4e24\u4e24\u4e4b\u95f4\u8fde\u63a5\u6240\u7528\u7684\u5206\u9694\u7b26\uff0c\u82e5\u7701\u7565\u8be5\u53c2\u6570\uff0c\u5219<br>\u00a0\u00a0\u00a0\u00a0 \/\/\u4f7f\u7528\u9017\u53f7\u4f5c\u4e3a\u5206\u9694\u7b26<br>\u00a0\u00a0\u00a0\u00a02\u3001reverse\u51fd\u6570\uff1a\u5c06\u6570\u7ec4\u5143\u7d20\u7684\u987a\u5e8f\u98a0\u5012<br>\u00a0\u00a0\u00a0\u00a0 \u4f8b\uff1a<code>arrayObject.reverse()<\/code><br>\u00a0\u00a0\u00a0\u00a0 \/\/\u7279\u522b\u6ce8\u610f\uff1a\u8be5\u51fd\u6570\u53ea\u4f1a\u6539\u53d8\u539f\u6765\u7684\u6570\u7ec4\uff0c\u4e0d\u4f1a\u521b\u5efa\u65b0\u6570\u7ec4<br>\u00a0\u00a0\u00a0\u00a03\u3001sort\u51fd\u6570\uff1a\u5c06\u6570\u7ec4\u5143\u7d20\u91cd\u65b0\u6392\u5e8f<br>\u00a0\u00a0\u00a0\u00a0 \u4f8b\uff1a<code>arrayObjecct.sort(sortby)<\/code><br>\u00a0\u00a0\u00a0\u00a0 \/\/sortby\u4e3a\u53ef\u9009\u53c2\u6570\uff0c\u7528\u4e8e\u89c4\u5b9a\u6392\u5e8f\u987a\u5e8f\uff0c\u82e5\u4f7f\u7528\u8be5\u53c2\u6570\uff0c\u5219\u5fc5\u987b\u662f\u4e00\u4e2a\u6bd4\u8f83\u51fd\u6570\uff0c\u5373<br><code>\u00a0\u00a0\u00a0\u00a0 function sortby(a,b)<br>\u00a0\u00a0\u00a0\u00a0 {<br>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0  return a-b;<br>\u00a0\u00a0\u00a0\u00a0  }<\/code><br>\u00a0\u00a0\u00a0\u00a0   sortby\u5982\u4e0a\u5b9a\u4e49\u65f6\uff0c\u5219sort\u51fd\u6570\u53ef\u5bf9\u6574\u5f62\u6570\u7ec4\u7531\u5c0f\u5230\u5927\u6392\u5e8f\u3002<br>\u00a0\u00a0\u00a0\u00a0 4\u3001length\u51fd\u6570\uff1a\u8fd4\u56de\u6570\u7ec4\u957f\u5ea6<\/p>\n\n\n\n<p>\u4e94\u3001\u65e5\u671f\u51fd\u6570<br>      <strong>getYear\u51fd\u6570<\/strong>\uff1a\u8fd4\u56de\u65e5\u671f\u7684\u201c\u5e74\u201d\u90e8\u5206\uff0c\u8fd4\u56de\u503c\u4ee51900\u5e74\u4e3a\u57fa\u6570\uff1b<br>     <strong> getMonth\u51fd\u6570<\/strong>\uff1a\u8fd4\u56de\u65e5\u671f\u7684\u201c\u6708\u201d\u90e8\u5206\uff0c\u8fd4\u56de\u503c\u4e3a0~11<br>      <strong>getDay\u51fd\u6570<\/strong>\uff1a\u8fd4\u56de\u661f\u671f\u51e0\uff0c\u503c\u4e3a0~6\uff0c\u5176\u4e2d0\u662f\u5468\u65e5\uff0c1\u662f\u5468\u4e00&#8230;<br>      <strong>getData\u51fd\u6570<\/strong>\uff1a\u8fd4\u56de\u65e5\u671f\u7684\u201c\u65e5\u201d\u90e8\u5206\uff0c\u503c\u4e3a1~31<br>      <strong>getHours\u51fd\u6570<\/strong>\uff1a\u8fd4\u56de\u65e5\u671f\u7684\u201c\u5c0f\u65f6\u201d\u90e8\u5206\uff0c\u503c\u4e3a0~23<br>     <strong> getMinutes\u51fd\u6570<\/strong>\uff1a\u8fd4\u56de\u65e5\u671f\u7684\u201c\u5206\u949f\u201d\u90e8\u5206\uff0c\u503c\u4e3a0~59<br>     <strong> getSeconds\u51fd\u6570<\/strong>\uff1a\u8fd4\u56de\u65e5\u671f\u7684\u201c\u79d2\u949f\u201d\u90e8\u5206\uff0c\u503c\u4e3a0~59<br>      <strong>getTime\u51fd\u6570<\/strong>\uff1a\u8fd4\u56de\u7cfb\u7edf\u65f6\u95f4\uff0c\u5177\u4f53\u4e3a1970\u5e741\u67081\u65e5\u81f3\u4eca\u4e4b\u95f4\u7684\u6beb\u79d2\u6570<br>&#8230;(\u4ee5\u4e0a\u51fd\u6570\u7686\u5c5e\u4e8edate\u7c7b\u51fd\u6570\uff0c\u4f7f\u7528\u65f6\uff0c\u5e94<br><code>var d=new Date();<br>var r=d.function;<\/code><\/p>\n","protected":false},"excerpt":{"rendered":"<p>JavaScript\u7cfb\u7edf\u51fd\u6570\u4e00\u822c\u53ef\u5206\u4e3a\u5e38\u89c4\u51fd\u6570\u3001\u5b57\u7b26\u4e32\u51fd\u6570\u3001\u6570\u5b66\u51fd\u6570\u3001\u6570\u7ec4\u51fd\u6570\u548c\u65e5\u671f\u51fd\u6570\u7b49\u4e94\u5927\u7c7b\u3002 \u4e00\u3001\u5e38\u89c4\u51fd&hellip;<a href=\"https:\/\/www.notown.top\/?p=271\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">JavaScript\u7cfb\u7edf\u51fd\u6570<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","footnotes":""},"categories":[13],"tags":[],"class_list":["post-271","post","type-post","status-publish","format-standard","hentry","category-javascript"],"_links":{"self":[{"href":"https:\/\/www.notown.top\/index.php?rest_route=\/wp\/v2\/posts\/271","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.notown.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.notown.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.notown.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.notown.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=271"}],"version-history":[{"count":7,"href":"https:\/\/www.notown.top\/index.php?rest_route=\/wp\/v2\/posts\/271\/revisions"}],"predecessor-version":[{"id":415,"href":"https:\/\/www.notown.top\/index.php?rest_route=\/wp\/v2\/posts\/271\/revisions\/415"}],"wp:attachment":[{"href":"https:\/\/www.notown.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=271"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.notown.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=271"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.notown.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=271"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}