{"id":888,"date":"2022-06-06T02:37:04","date_gmt":"2022-06-05T18:37:04","guid":{"rendered":"https:\/\/www.jieshop.info\/?p=888"},"modified":"2022-06-06T02:37:04","modified_gmt":"2022-06-05T18:37:04","slug":"javascript%e7%9a%84%e4%b8%80%e4%ba%9b%e6%80%bb%e7%bb%93","status":"publish","type":"post","link":"https:\/\/www.jieshop.info\/?p=888","title":{"rendered":"JavaScript\u7684\u4e00\u4e9b\u603b\u7ed3"},"content":{"rendered":"\n

\u6613\u9519\u9898<\/strong>\u3001\u9519\u9898\u56de\u987e<\/h1>\n\n\n\n
\u603b\u7ed3<\/th><\/tr><\/thead>
01-else…if<\/strong>\u662f\u5206\u5f00\u7684,\u5408\u5728\u4e00\u8d77\u51fa\u4e86\u9519\u8bef<\/td><\/tr>
02-\u5916\u63a7\u884c\uff0c\u5185\u63a7\u5217 \u770b\u591a\u5c11\u884c\u786e\u5b9ai\uff1b\u770b\u591a\u5c11\u5217\u786e\u5b9aj<\/td><\/tr>
03-\u6570\u636e\u7c7b\u578b\u8bb0\u5f97\u8981\u8f6c\u6362Number(\u503c)<\/td><\/tr>
04-\u4e07\u7269\u7686\u63a8\u76d2\u5b50<\/td><\/tr>
05-length\u5199\u5bf9,\u4e0d\u7136\u904d\u5386\u4e0d\u6210\u529f<\/strong> arguments.length<\/td><\/tr>
return \u8fd4\u56de\u503c\uff0c\u8bbe\u8ba1\u53d8\u91cf\u540d\u63d0\u5347 \u51fd\u6570\u5185\u5916\u5b9a\u4e49\u540c\u4e00\u4e2a\u53d8\u91cf\uff0c\u51fd\u6570\u5728\u524d\u5b9a\u4e49\u4f7f\u7528 \u6ca1\u7528\u8fd4\u56de\u503c\u65f6\u6536\u5230\u7684\u53d8\u91cf\u6253\u5370\u662fundefined<\/td><\/tr>
for…in \u8bbf\u95ee\u5bf9\u8c61\u7684i \u53ea\u80fd\u7528 \u5bf9\u8c61\u540d[i]\u6765\u904d\u5386,\u56e0\u4e3ai\u662f\u5b57\u7b26\u4e32<\/td><\/tr>
str.split()\u5207\u5272\u540e\u7684\u4e1c\u897f\u662f\u6570\u7ec4<\/td><\/tr>
\u5b9a\u4e49 \u5b57\u7b26\u4e32str\u5b83\u7684\u503c\u4e0d\u80fd\u88ab\u8d4b\u503cstr[i]<\/td><\/tr>
\u65b0\u5efa\u6587\u4ef6\u5939 \u64a4\u9500 \u91cc\u9762\u7684\u5185\u5bb9\u4f1a\u5168\u90e8\u6ca1\u6709 \u627e\u4e0d\u56de\u6765<\/td><\/tr>
\u5fc5\u987b\u5148\u5b9e\u4f8b\u5316\u624d\u80fd\u4f7f\u7528Date\u65f6\u95f4<\/mark><\/td><\/tr>
splice\u5207\u5272\u4f1a\u5c11\u5faa\u73af<\/strong><\/td><\/tr>
if(text == “”) \u90a3\u4e2a<\/mark>\u7b26\u53f7\u8bb0\u5f97\u5199\u4e0d\u8981\u5199\u6210\u8d4b\u503c==<\/td><\/tr>
checkbox.checked\u5c31\u53ef\u4ee5\u5224\u65ad\u5b83true\u6216false\u8f6c\u6362<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

<\/p>\n\n\n\n

\u6280\u5de7\u7ec6\u8282\u6df1\u7a76<\/h1>\n\n\n\n
\u6280\u5de7\u7ec6\u8282\u6df1\u7a76<\/th><\/tr><\/thead>
\u6570\u7ec4\u7684\u4e0b\u6807\u7b49\u4e8e\u6570\u7ec4\u957f\u5ea6-1 \u6211\u4eec\u4f5c\u4e3a\u904d\u5386\u7684\u65f6\u5019\u53ef\u4ee5\u5b9a\u4e49<\/strong><\/td><\/tr>
len=arr.length \u7136\u540e\u4f7f\u5f97i<len \u904d\u5386\u5373\u53ef\u6210\u529f<\/td><\/tr>
\u4e0e\u6570\u7ec4\u76f8\u5173\u7684\u9898\u76ee\u7684\u9700\u6c42\u4e00\u822c\u90fd\u662f\u9700\u8981\u6570\u7ec4\u7684\u904d\u5386 \u5faa\u73affor<\/td><\/tr>
\u9700\u6c42(\u9898\u76ee) \u5b9e\u73b0(\u505a\u51fa\u6765) bug(\u9519\u8bef)<\/td><\/tr>
\u62ec\u53f7 \u53ef\u4ee5\u7528\u8ba1\u7b97\u62ec\u53f7()<\/td><\/tr>
reutrn \u8bb0\u5f97\u8fd4\u56de\u503c\u8981\u8bb0\u5f97\u5199 \u907f\u514d\u53d8\u91cf\u63d0\u5347\u95ee\u9898<\/td><\/tr>
\u666e\u901a\u5e74\u80fd\u88ab4\u6574\u9664\u4e14\u4e0d\u80fd\u88ab100\u6574\u9664\u7684\u3002 \u4e3a\u95f0\u5e74 \u5426\u5219\u4e3a\u5e73\u5e74<\/td><\/tr>
\u51fd\u6570\u5916\u7684\u547d\u4ee4\u5199\u5728\u4e0b\u9762 var arr=[] ; fn(arr);<\/td><\/tr>
string\u5bf9\u8c61\u65b9\u6cd5 \u4e0d\u5f71\u54cd\u539f\u6765\u7684\u5b57\u7b26\u4e32<\/td><\/tr>
for in \u904d\u5386\u6570\u7ec4 \u6570\u7ec4\u91cc\u9762\u6709\u5bf9\u8c61for(var i in arr)<\/td><\/tr>
arr[i].\u5c5e\u6027\u540d \u4ee3\u8868\u7684\u662f\u5bf9\u8c61\u8bbf\u95ee\u5c5e\u6027\u540d arr\u662f\u5bf9\u8c61<\/td><\/tr>
\u6570\u7ec4\u4e5f\u53ef\u4ee5\u653e\u5bf9\u8c61 [{},{},{}]<\/td><\/tr>
windows+l \u9501\u5c4f<\/td><\/tr>
window.onload functiong(){} \u9884\u52a0\u8f7d<\/td><\/tr>
\u8f93\u4e1c\u897f\u5927\u5c0f\u5199\u8f6c\u6362 \u56fe\u7247\u5feb\u6377\u952e\u5728\u4e0b\u9762<\/td><\/tr>
\u4f2a\u6570\u7ec4\u7684\u83b7\u53d6\u5143\u7d20\u65b9\u6cd5\u6709 :getElementsByTagName()\u3001getElementsByName()\u3001querySelectorAll()\u3001getElementsByClassName() \u8bb0\u5f97\u8bbf\u95ee\u7684\u65f6\u5019\u52a0[]\u4e2d\u62ec\u53f7<\/td><\/tr>
images preview \u63d2\u4ef6\u663e\u793a\u56fe\u50cf<\/td><\/tr>
\u8868\u5355\u63a7\u4ef6 input textarea text \u4e0d\u8981\u7528innerHTML\u6216innertext \u7528text.value\u6765\u83b7\u53d6\u5b83\u7684\u503c<\/td><\/tr>
getComputedStyle \u83dc\u9e1f \u67e5\u8be2\u8bed\u6cd5\u7684\u65b9\u6cd5 \u8bed\u6cd5(\u7a7a\u683c) \u53c2\u8003\u7f51\u7ad9<\/td><\/tr>
\u62ec\u53f7 \u53ef\u4ee5\u7528\u8ba1\u7b97\u62ec\u53f7()<\/td><\/tr>
reutrn \u65b9\u6cd5\u51fd\u6570 \u8bb0\u5f97\u8fd4\u56de\u503c\u8981\u8bb0\u5f97\u5199<\/td><\/tr>
\u907f\u514d\u53d8\u91cf\u63d0\u5347\u95ee\u9898<\/td><\/tr>
for in \u904d\u5386\u6570\u7ec4 \u6570\u7ec4\u91cc\u9762\u6709\u5bf9\u8c61 for(var i in arr)<\/td><\/tr>
\u7acb\u5373\u51fd\u6570 ( function(){} ) ()<\/td><\/tr>
console.dir(\u6784\u9020\u51fd\u6570\u540d) \u8f93\u51fa\u6253\u5370\u5bf9\u8c61\u7684\u6240\u6709\u5c5e\u6027\u548c\u5c5e\u6027\u503c<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

\u6570\u7ec4\u65b9\u6cd5<\/h1>\n\n\n\n

1. filter() \u8fc7\u6ee4\u65b9\u6cd5\\\u51fd\u6570<\/h2>\n\n\n\n

1.\u56de\u8c03\u51fd\u6570 \u4e09\u4e2a\u53c2\u6570 item,index,array<\/p>\n\n\n\n

  1. filter\u6709\u904d\u5386\u6570\u7ec4\u7684\u529f\u80fd<\/li>
  2. filter\u4e0d\u80fd\u51fa\u73b0break\u548ccontinue<\/li>
  3. filter \u8fd4\u56de\u503c\u662f\u4e00\u4e2a\u6570\u7ec4<\/li>
  4. \u56de\u8c03\u51fd\u6570\u8fd4\u56de\u4e00\u4e2a\u5e03\u5c14\u503c(\u81ea\u52a8\u8f6c\u6362) true false<\/strong><\/li>
  5. \u9047\u5230return\u4e0d\u80fd\u7ec8\u6b62\u5faa\u73af\u7684\u6267\u884c<\/li><\/ol>\n\n\n\n
     <script>\r\n        var arr = [50, 60, 90, 70, 80];\r\n        var res = arr.filter(function (item, index, array) {\r\n\r\n            console.log(item, item > 60);\r\n            return item > 60;\r\n        })\r\n        console.log(res);\r\n    <\/script><\/code><\/pre>\n\n\n\n
    2. \u6570\u7ec4\u7684map( )\u9010\u4e00\u5904\u7406<\/h2>\n\n\n\n
    1.map\u4e5f\u9700\u8981\u4e00\u4e2a\u56de\u8c03\u51fd\u6570,\u4e09\u4e2a\u53c2\u6570,\u6570\u7ec4\u5143\u7d20,\u6570\u7ec4\u4e0b\u6807,\u904d\u5386\u7684\u6570\u7ec4<\/p>\n\n\n\n
    2.map\u4e5f\u6709\u904d\u5386\u6570\u7ec4\u7684\u529f\u80fd<\/p>\n\n\n\n
    1. map\u7684\u56de\u8c03\u51fd\u6570\u4e2d\u4e0d\u5141\u8bb8\u51fa\u73b0break\u548ccontinuenue\u5173\u952e\u5b57<\/li>
    2. map\u6709\u8fd4\u56de\u503c,\u8fd4\u56de\u503c\u662f\u4e00\u4e2a\u6570\u7ec4<\/li>
    3. map\u56de\u8c03\u51fd\u6570\u4e2d,\u9700\u8981return\u8fd4\u56de\u503c;\u56de\u8c03\u51fd\u6570return\u4ec0\u4e48,map\u6570\u7ec4\u5143\u7d20\u5bf9\u5e94\u5c31\u662f\u4ec0\u4e48<\/li>
    4. \u56de\u8c03\u51fd\u6570\u5982\u679c\u6ca1\u6709\u8fd4\u56de\u503c,\u6570\u7ec4\u5143\u7d20\u7684\u503c\u90fd\u662funderfined<\/li><\/ol>\n\n\n\n
         <script>\n        var arr = [2, 6, 6, 90, 80];\n        var res = arr.map(function (item, index, array) {\n\n            return item;\n        })\n        console.log(res);\n    <\/script>\n\/\/\u7ed3\u679c:[2, 6, 6, 90, 80]<\/code><\/pre>\n\n\n\n
      3.\u5192\u6ce1\u6392\u5e8f<\/h2>\n\n\n\n
       <script>\r\n   \/\/ \u628a\u5192\u6ce1\u6392\u5e8f\u5c01\u88c5\u6210\u4e00\u4e2a\u51fd\u6570\r\n        function bubbleSort( myArr ){\r\n            for(var i = 0; i < myArr.length - 1; i++ ){\r\n                for(var j = 0; j < myArr.length - 1 - i; j++ ){\r\n                    if( myArr[j] > myArr[j+1] ){\r\n                        \/\/ \u4ea4\u6362\u4e24\u4e2a\u53d8\u91cf\u7684\u503c\r\n                        var temp = myArr[j+1];\r\n                        myArr[j+1] = myArr[j];\r\n                        myArr[j] = temp;\r\n                    }\r\n                }\r\n            }\r\n            return myArr;\r\n        }\r\n\r\n        var arr = [20, 5, 12, 32, 41];\r\n        bubbleSort( arr );\r\n        console.log( arr );\r\n    <\/script><\/code><\/pre>\n\n\n\n
      4.\u6392\u4ed6\u601d\u60f3<\/h2>\n\n\n\n
       <style>\r\n        *{\r\n            margin: 0;\r\n            padding: 0;\r\n        }\r\n        li{\r\n            list-style:none;\r\n        }\r\n        .box{\r\n            width: 300px;\r\n            margin:100px auto;\r\n        }\r\n        .box ul{\r\n            display: flex;\r\n            justify-content: space-between;\r\n            color:#acb0b1;\r\n        }\r\n        .box ul li{\r\n            cursor: pointer;\r\n        }\r\n        \/* \u662f.box ul li\u5e76\u4e14\u5177\u6709.active\u7c7b\u540d *\/\r\n        .box ul li.active{\r\n            color:red;\r\n            border-bottom:2px solid red;\r\n        }\r\n    <\/style>\r\n<\/head>\r\n<body>\r\n    <div class=\"box\">\r\n        <ul>\r\n            <li class=\"active\">\u7cbe\u9009<\/li>\r\n            <li>\u7f8e\u98df<\/li>\r\n            <li>\u767e\u8d27<\/li>\r\n            <li>\u4e2a\u62a4<\/li>\r\n            <li>\u9884\u544a<\/li>\r\n        <\/ul>\r\n    <\/div>\r\n\r\n    <script>\r\n        \/\/ \u7ed9.box ul\u4e2d\u6240\u6709li\u7ed1\u5b9a\u9f20\u6807\u70b9\u51fb\u4e8b\u4ef6\r\n        var lis = document.querySelectorAll(\".box ul li\");\r\n        \/\/ \u6bcf\u4e2ali\u90fd\u9700\u8981\u7ed1\u5b9a\u9f20\u6807\u70b9\u51fb\u4e8b\u4ef6\r\n        for(var i = 0; i < lis.length; i++ ){\r\n            lis[i].onclick = function(){\r\n                \/\/ \u8fd9\u91cc,\u5728\u4e8b\u4ef6\u5904\u7406\u51fd\u6570\u4e2d,\u65e0\u6cd5\u4f7f\u7528i,\u56e0\u4e3a\u6211\u4eec\u662f\u5faa\u73af\u7ed1\u5b9a\u5b8c\u6bd5\u4ee5\u540e,\u624d\u53ef\u4ee5\u89e6\u53d1\u4e8b\u4ef6;\u80fd\u591f\u89e6\u53d1\u4e8b\u4ef6\u4ee5\u540e,\u8868\u793a\u5faa\u73af\u5df2\u7ecf\u5b8c\u6bd5,i\u7684\u503c\u5df2\u7ecf\u662f5\u4e86,\u800c\u4e14i\u662f\u5168\u5c40\u53d8\u91cf\r\n                \/\/ console.log( i );\/\/ 5\r\n                \/\/ console.log( lis[i] );\/\/ undefined\r\n\r\n                \/\/ this\u5173\u952e\u5b57,this\u4f1a\u4ee3\u8868\u5f53\u524d\u7ed1\u5b9a\u4e8b\u4ef6\u7684\u8fd9\u4e2a\u4e8b\u4ef6,\u63a5\u7740\u8c01\u89e6\u53d1\u8fd9\u4e2a\u4e8b\u4ef6,this\u5c31\u4ee3\u8868\u8c01\r\n                \/\/ console.log( this );\r\n\r\n                \/\/ \u6ce8\u610f: \u5148\u6e05\u9664\u6240\u6709,\u518d\u8bbe\u7f6e\u5f53\u524d\r\n\r\n                \/\/ \u6e05\u9664\u6240\u6709li\u8eab\u4e0a\u7684active\u7c7b\u540d\r\n                for(var j = 0; j < lis.length; j++ ){\r\n                    lis[j].classList.remove(\"active\");\r\n                }\r\n\r\n                \/\/ \u7ed9\u5f53\u524d\u88ab\u70b9\u51fb\u7684li\u6dfb\u52a0active\u7c7b\u540d\r\n                this.classList.add(\"active\");\r\n            }\r\n        }\r\n    <\/script><\/code><\/pre>\n\n\n\n
      <\/p>\n\n\n\n
      dom\u5bf9\u8c61.dataset.index\u83b7\u53d6<\/h2>\n\n\n\n
      H5\u81ea\u5b9a\u4e49\u5c5e\u6027<\/h2>\n\n\n\n
      \u81ea\u5b9a\u4e49\u5c5e\u6027\u76ee\u7684:\u662f\u4e3a\u4e86\u4fdd\u5b58\u5e76\u4f7f\u7528\u6570\u636e\u3002\u6709\u4e9b\u6570\u636e\u53ef\u4ee5\u4fdd\u5b58\u5230\u9875\u9762\u4e2d\u800c\u4e0d\u7528\u4fdd\u5b58\u5230\u6570\u636e\u5e93\u4e2d\u3002<\/th><\/tr><\/thead>
      \u81ea\u5b9a\u4e49\u5c5e\u6027\u83b7\u53d6\u662f\u901a\u8fc7getAttribute(“\u5c5e\u6027\u540d”)<\/mark> \u83b7\u53d6\u3002<\/td><\/tr>
      \u4f46\u662f\u6709\u4e9b\u81ea\u5b9a\u4e49\u5c5e\u6027\u5f88\u5bb9\u6613\u5f15\u8d77\u6b67\u4e49\uff0c\u4e0d\u5bb9\u6613\u5224\u65ad\u662f\u5143\u7d20\u7684\u5185\u7f6e\u5c5e\u6027\u8fd8\u662f\u81ea\u5b9a\u4e49\u5c5e\u6027<\/strong>\u3002<\/td><\/tr>
      \u6240\u4ee5,H5\u7ed9\u6211\u4eec\u65b0\u589e\u4e86\u81ea\u5b9a\u4e49\u5c5e\u6027<\/mark><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
      \u8bbe\u7f6eH5\u81ea\u5b9a\u4e49\u5c5e\u6027<\/strong><\/mark>(dataset\u8bbe\u7f6e)<\/h4>\n\n\n\n
      H5\u89c4\u5b9a\u81ea\u5b9a\u4e49\u5c5e\u6027\"data-\"\u5f00\u5934\u4f5c\u4e3a\u5c5e\u6027\u540d\u5e76\u4e14\u8d4b\u503c
      \u6bd4\u5982<div data-index=\"1\"><\/div>
      \u200b
      \u6216\u8005\u4f7f\u7528JS\u8bbe\u7f6e
      \u200b
      element.setAttribute(\"data-index\",1)
      \u200b
      \u6216\u8005\u4f7f\u7528H5\u65b0\u589e\u8bbe\u7f6e\u65b9\u6cd5
      element.dataset.index = \u503c    \u6216\u8005 element.dataset[\"index\"] = \u503c
      \u4f46\u662f\u8981\u6ce8\u610fie 11\u4ee5\u540e\u624d\u652f\u6301;\u5982\u679c\u81ea\u5b9a\u4e49\u5c5e\u6027\u91cc\u9762\u6709\u591a\u4e2a-\u94fe\u63a5\u7684\u5355\u8bcd\uff0c\u6211\u4eec\u83b7\u53d6\u7684\u65f6\u5019\u91c7\u53d6 \u9a7c\u5cf0\u547d\u540d\u6cd5<\/pre>\n\n\n\n
      data-index \u662f\u5b57\u7b26\u4e32<\/p>\n\n\n\n
      \u83b7\u53d6H5\u81ea\u5b9a\u4e49\u5c5e\u6027<\/mark><\/h4>\n\n\n\n
      \u6bd4\u5982 <div data-index=\"1\"><\/div>\n\n1. \u517c\u5bb9\u6027\u83b7\u53d6 \u00a0 element.getAttribute(\"data-index\");\n2. H5\u65b0\u589e\u83b7\u53d6\u65b9\u6cd5 element.dataset.index \u6216\u8005 element.dataset[\"index\"] \u00a0 \n\u4f46\u662f\u8981\u6ce8\u610fie 11\u4ee5\u540e\u624d\u652f\u6301;\u5982\u679c\u81ea\u5b9a\u4e49\u5c5e\u6027\u91cc\u9762\u6709\u591a\u4e2a-\u94fe\u63a5\u7684\u5355\u8bcd\uff0c\u6211\u4eec\u83b7\u53d6\u7684\u65f6\u5019\u91c7\u53d6 \u9a7c\u5cf0\u547d\u540d\u6cd5<\/pre>\n\n\n\n
      <script>
              \/\/ \u8981\u6c42\u4e0e\u601d\u8def
              \/\/ \u70b9\u51fb.nav a\u7684\u65f6\u5019,\u53ef\u4ee5\u9ad8\u4eae\u5f53\u524d\u88ab\u70b9\u51fb\u7684a\u6807\u7b7e(\u6dfb\u52a0active\u7c7b)
              \/\/ \u5bf9\u5e94\u7684.cont\u5c42\u9700\u8981\u6dfb\u52a0active\u7c7b
      \u200b
              \/\/ \u83b7\u53d6\u6240\u5b66\u7684dom\u5bf9\u8c61
              var navAs = document.querySelectorAll(\".nav a\");
              var conts = document.querySelectorAll(\".cont\");
              \/\/ \u7ed9\u6bcf\u4e2a.nav\u91cc\u9762\u7684a\u6807\u7b7e\u7ed1\u5b9a\u9f20\u6807\u70b9\u51fb\u4e8b\u4ef6
              for(var i = 0; i < navAs.length; i++ ){
                  \/\/ \u7ed9a\u6807\u7b7e\u6dfb\u52a0\u81ea\u5b9a\u4e49\u5c5e\u6027
                  \/\/ navAs[i].setAttribute(\"data-index\", i );
                  navAs[i].dataset.index = i;
      \u200b
                  navAs[i].onclick = function(){
                      \/\/ \u6e05\u9664\u6240\u6709a\u6807\u7b7e\u548c.cont\u5c42\u5bf9\u5e94\u7684active\u7c7b\u540d
                      for(var j = 0; j < navAs.length; j++ ){
                          navAs[j].classList.remove(\"active\");
                          conts[j].classList.remove(\"active\");
                      }
      \u200b
                      \/\/ \u5f53\u524d\u88ab\u70b9\u51fb\u7684a\u6807\u7b7e\u9ad8\u4eae(\u6dfb\u52a0\u6307\u5b9a\u7c7b\u540d)
                      \/\/ console.log( this );
                      this.classList.add(\"active\");
      \u200b
                      \/\/ \u83b7\u53d6\u5f53\u524d\u88ab\u70b9\u51fba\u6807\u7b7e\u8eab\u4e0a\u7684\u81ea\u5b9a\u4e49\u5c5e\u6027data-index\u7684\u503c
                      \/\/ var index = this.getAttribute(\"data-index\");
                      var index = this.dataset.index;
      \u200b
                      \/\/ \u663e\u793a\u5bf9\u5e94\u7684.cont\u5c42
                      conts[index].classList.add(\"active\");
                  }
              }
          <\/script><\/code><\/pre>\n\n\n\n
      \u5faa\u73af\u8bbe\u5b9a\u81ea\u5b9a\u4e49\u5c5e\u6027<\/strong><\/p>\n\n\n\n
          \/\/ \u7ed9a\u6807\u7b7e\u6dfb\u52a0\u81ea\u5b9a\u4e49\u5c5e\u6027
                  \/\/ navAs[i].setAttribute(\"data-index\", i );
                  navAs[i].dataset.index = i;<\/code><\/pre>\n\n\n\n
      \u83b7\u53d6\u5f53\u524d\u70b9\u51fb\u7684\u81ea\u5b9a\u4e49\u5c5e\u6027\u7684\u503c<\/strong><\/p>\n\n\n\n
      \/\/ \u83b7\u53d6\u5f53\u524d\u88ab\u70b9\u51fba\u6807\u7b7e\u8eab\u4e0a\u7684\u81ea\u5b9a\u4e49\u5c5e\u6027data-index\u7684\u503c\r\n\t\/\/ var index = this.getAttribute(\"data-index\");\r\n\tvar index = this.dataset.index;<\/code><\/pre>\n\n\n\n
      11.9\u53ef\u4ee5\u6539\u53d8\u51fd\u6570\u5185\u90e8 this \u6307\u5411\u7684\u4e09\u4e2a\u65b9\u6cd5<\/strong><\/mark><\/p>\n\n\n\n
      \u6539\u53d8\u51fd\u6570\u5185\u90e8 this \u6307\u5411<\/strong><\/mark><\/th><\/tr><\/thead>
      call() \u53c2\u6570\u5217\u8868<\/td><\/tr>
      bind() \u53c2\u6570 \u4e0d\u8c03\u7528\u51fd\u6570<\/td><\/tr>
      apply()\u6570\u7ec4<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
      call(this\u7684\u503c,\u53c2\u65701,\u53c2\u65702,\u53c2\u6570n…)<\/h4>\n\n\n\n
      Javascript\u4e3a\u6211\u4eec\u4e13\u95e8\u63d0\u4f9b\u4e86\u4e00\u4e9b\u51fd\u6570\u65b9\u6cd5\u5e2e\u6211\u4eec\u66f4\u4f18\u96c5\u7684\u5904\u7406\u51fd\u6570\u5185\u90e8this\u7684\u6307\u5411\u95ee\u9898,\u5e38\u7528\u7684\u6709 call() \u3001bind() \u3001apply() \u4e09\u79cd\u65b9\u6cd5<\/p>\n\n\n\n
      call()\u65b9\u6cd5\u8c03\u7528\u4e00\u4e2a\u5bf9\u8c61\u3002\u7b80\u5355\u7406\u89e3\u4e3a \u662f\u4e00\u79cd\u8c03\u7528\u51fd\u6570\u7684\u65b9\u5f0f , \u4f46\u662f\u5b83\u53ef\u4ee5\u6539\u53d8\u51fd\u6570\u7684 this \u6307\u5411<\/p>\n\n\n\n
      \u5e94\u7528\u573a\u666f: \u7ecf\u5e38\u7528call\u5b9e\u73b0\u7ee7\u627f.<\/p>\n\n\n\n
      \u51fd\u6570.call(thisArg,arg1,arg2,...)\r\n\u200b\r\n\u53c2\u6570\u8bf4\u660e:\r\n\u00a0 thisArg \u00a0 \u00a0 : \u5728\u51fd\u6570\u8fd0\u884c\u65f6\u6307\u5b9a\u7684 this \u503c,\u5982\u679c\u4e0d\u9700\u8981\u6539\u53d8\u51fd\u6570\u5185\u90e8this\u6307\u5411,\u53ef\u4ee5\u4f20\u9012null\r\n\u00a0 arg1,arg2... : \u4f20\u9012\u7684\u5176\u4ed6\u53c2\u6570,\u4f7f\u7528\u9017\u53f7\u9694\u5f00\r\n\u200b\r\n\u200b\r\n\u8fd4\u56de\u503c\u5c31\u662f\u51fd\u6570\u7684\u8fd4\u56de\u503c\uff0c\u56e0\u4e3a\u5b83\u5c31\u662f\u8c03\u7528\u51fd\u6570\r\n\u56e0\u6b64\u5f53\u6211\u4eec\u60f3\u6539\u53d8 this \u6307\u5411\uff0c\u540c\u65f6\u60f3\u8c03\u7528\u8fd9\u4e2a\u51fd\u6570\u7684\u65f6\u5019\uff0c\u53ef\u4ee5\u4f7f\u7528 call\uff0c\u6bd4\u5982\u7ee7\u627f<\/code><\/pre>\n\n\n\n
      apply(this\u7684\u503c,[\u6570\u7ec4\u7684\u503c])<\/h4>\n\n\n\n
      apply()\u65b9\u6cd5\u8c03\u7528\u4e00\u4e2a\u5bf9\u8c61\u3002\u7b80\u5355\u7406\u89e3\u4e3a \u662f\u4e00\u79cd\u8c03\u7528\u51fd\u6570\u7684\u65b9\u5f0f , \u4f46\u662f\u5b83\u53ef\u4ee5\u6539\u53d8\u51fd\u6570\u7684 this \u6307\u5411<\/p>\n\n\n\n
      \u5e94\u7528\u573a\u666f: \u7ecf\u5e38\u8ddf\u6570\u7ec4\u6709\u5173\u7cfb<\/p>\n\n\n\n
      \u51fd\u6570.apply(thisArg, [argsArray])\r\n\u200b\r\n\u53c2\u6570\u8bf4\u660e:\r\n\u00a0 \u00a0thisArg\uff1a\u5728\u51fd\u6570\u8fd0\u884c\u65f6\u6307\u5b9a\u7684 this \u503c,\u5982\u679c\u4e0d\u9700\u8981\u6539\u53d8\u51fd\u6570\u5185\u90e8this\u6307\u5411,\u53ef\u4ee5\u4f20\u9012null\r\n\u200b\r\n\u00a0 \u00a0argsArray\uff1a\u4f20\u9012\u7684\u503c\uff0c\u5fc5\u987b\u5305\u542b\u5728\"\u6570\u7ec4\"\u91cc\u9762, \u6570\u7ec4\u4e2d\u7684\u5143\u7d20\u4f1a\u4e00\u4e2a\u4e00\u4e2a\u5bf9\u5e94\u4f20\u9012\u7ed9apply()\u524d\u9762\u51fd\u6570\u7684\u5f62\u53c2\u5217\u8868\u4e2d\r\n\u200b\r\n\u200b\r\n\u8fd4\u56de\u503c\u5c31\u662f\u51fd\u6570\u7684\u8fd4\u56de\u503c\uff0c\u56e0\u4e3a\u5b83\u5c31\u662f\u8c03\u7528\u51fd\u6570\r\n\u56e0\u6b64 apply \u4e3b\u8981\u5e94\u8be5\u8ddf\u6570\u7ec4\u6709\u5173\u7cfb\uff0c\u6bd4\u5982\u4f7f\u7528 Math.max() \u6c42\u6570\u7ec4\u7684\u6700\u5927\u503c<\/code><\/pre>\n\n\n\n
      \u4f8b\u5b50:<\/strong><\/p>\n\n\n\n
      apply\u5e94\u7528,\u6c42\u6570\u7ec4\u4e2d\u7684\u6700\u5927\u503c\u6216\u8005\u6700\u5927\u503c<\/p>\n\n\n\n
       Math.max.apply( null, [10,5,3,47,62,12] ); \/\/ 62\r\n\r\n Math.min.apply( null, [10,5,3,47,62,12] ); \/\/ 3  <\/code><\/pre>\n\n\n\n
      bind()<\/p>\n\n\n\n
      if (!Function.prototype.bind) {\r\n    Function.prototype.bind = function(that) {\r\n      var func = this, args = arguments;\r\n      return function() {\r\n        return func.apply(that, Array.prototype.slice.call(args, 1));\r\n      }\r\n    }\r\n  }\r\n  \/\/ \u53ea\u652f\u6301 bind \u9636\u6bb5\u7684\u9ed8\u8ba4\u53c2\u6570\uff1a\r\n  func.bind(that, arg1, arg2)();\r\n\r\n  \/\/ \u4e0d\u652f\u6301\u4ee5\u4e0b\u8c03\u7528\u9636\u6bb5\u4f20\u5165\u7684\u53c2\u6570\uff1a\r\n  func.bind(that)(arg1, arg2); <\/code><\/pre>\n\n\n\n
      \u539f\u751fjs\u7684\u70b9\u51fb\u4e8b\u4ef6\u7684index\u95ee\u9898\u529e\u6cd5<\/h2>\n\n\n\n
      <!DOCTYPE html>\r\n<html lang=\"zh-CN\">\r\n\r\n<head>\r\n    <meta charset=\"UTF-8\">\r\n    <meta http-equiv=\"X-UA-Compatible\" content=\"IE=edge\">\r\n    <meta name=\"viewport\" content=\"width=device-width, initial-scale=1.0\">\r\n    <title>Document<\/title>\r\n<\/head>\r\n\r\n<body>\r\n    <ul>\r\n        <li>1<\/li>\r\n        <li>2<\/li>\r\n        <li>3<\/li>\r\n        <li>4<\/li>\r\n    <\/ul>\r\n\r\n    <script>\r\n\r\n\r\n        var lis = document.querySelectorAll(\"li\");\r\n        \/\/ \u7b2c\u4e00\u79cd\u901a\u8fc7foreach\u904d\u5386\r\n        \/*      lis.forEach(function (item, index) {\r\n                 item.onclick = function () {\r\n                     console.log(\"\u7d22\u5f15\u503cindex\", index)\r\n                 }\r\n             }) *\/\r\n\r\n        \/\/ \u7b2c\u4e8c\u79cd for\u5faa\u73af\u904d\u5386 letes6\u8bed\u6cd5\r\n        \/*   for (let i = 0; i < lis.length; i++) {\r\n              lis[i].onclick = function () {\r\n                  console.log(\"\u7d22\u5f15\u503c==>\", i);\r\n              }\r\n  \r\n          } *\/\r\n\r\n\r\n        \/\/  \u7b2c\u4e09\u79cd\u95ed\u5305\u52a0\u7acb\u5373\u51fd\u6570\r\n        \/*     for (var i = 0; i < lis.length; i++) {\r\n                lis[i].onclick = (function (index) {\r\n                    console.log(\"\u5916\u90e8\u76f4\u63a5\u5c31\u6267\u884c\u4e86\")\r\n                    \/\/ \u8981\u8fd4\u56de\u503c \u95ed\u5305 \u4e0d\u7136\u76f4\u63a5\u5c31\u6267\u884c\u4e86\r\n                    return function () {\r\n                        console.log(\"\u7d22\u5f15\u503c==>\", index)\r\n                    }\r\n    \r\n                })(i)\r\n            } *\/\r\n\r\n\r\n        \/\/ \u7b2c\u56db\u79cd \u6570\u7ec4dom\u5bf9\u8c61.\u7c7b=\u503c\r\n        \/*    for (var i = 0; i < lis.length; i++) {\r\n               lis[i].index = i;\r\n               lis[i].onclick = function () {\r\n                   console.log(\"\u6570\u7ec4\u5bf9\u8c61dom\u7684\u7d22\u5f15\u503c\", this.index)\r\n                   console.log(\"this\u7684\u6307\u5411\u5c31\u662f\u8c03\u7528\u5b83\u7684\u4eba\");\r\n   \r\n               }\r\n           } *\/\r\n\r\n\r\n        \/\/ \u7b2c\u4e94\u79cd \u81ea\u5b9a\u4e49\u5c5e\u6027 data-index\r\n        \/*    for (var i = 0; i < lis.length; i++) {\r\n   \r\n               lis[i].setAttribute(\"data-index\", i);\r\n               lis[i].onclick = function () {\r\n                   var index = this.getAttribute('data-index')\r\n                   console.log(\"\u81ea\u5b9a\u4e49\u7d22\u5f15\u503c\", index)\r\n               }\r\n           } *\/\r\n\r\n\r\n        \/\/ \u7b2c\u516d\u79cd \u76d1\u542caddEventlistener\u770b\u770b\u884c\u4e0d\u884c \u9ad8\u9636\u51fd\u6570\r\n        for (var i = 0; i < lis.length; i++) {\r\n            function me(index) {\r\n                \/\/ console.log(\"\u76f4\u63a5\u8fd0\u884c==>\", index)\/\/\u8fd9\u6837\u4f1a\u76f4\u63a5\u8fd0\u884c \u9700\u8981\u9ad8\u9636\u51fd\u6570\r\n                return function () {\r\n                    console.log(\"\u9ad8\u9636\u51fd\u6570\u8fd0\u884c==>\", index)\r\n                }\r\n            }\r\n            \/\/ \u76d1\u542c\u76f4\u63a5\u5c31\u8fd9\u6837\u4e86\r\n            \/\/ \u51fd\u6570  me(i)\u7684\u4f4d\u7f6e\r\n            \/\/ lis[i].addEventListener('click', me(i))\r\n\r\n            \/*  lis[i].onclick = function () {\r\n                 console.log(i);\r\n                 me(i);\r\n             } *\/\r\n\r\n            lis[i].onclick = me(i);\r\n        }\r\n\r\n    <\/script>\r\n<\/body>\r\n\r\n<\/html><\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
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