重学ES系列之变量的作用范围

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发布于 2022-06-17 11:16:13

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发布于 2022-06-17 11:16:13

文章被收录于专栏：高端IT高端IT

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>变量的作用范围</title>
</head>
<body>
    
</body>
<script>
    // var与let
    /*
    var v1 = '1';
    console.log(v1); // 1
    v2 = '2';
    console.log(v2);
    console.log(v3);
    var v3 = 'v3';
    var v4 = 'v4';
    var v4 = 'v41';
    console.log(v4);
    for (var index = 0; index < 5; index++) {
        console.log(index);
    }
    console.log(index);
    */
    // ***
    /*
    let a1 = 'a1';
    console.log(a1);
    a2= 'a2';
    console.log(a2);
    console.log(a3);
    let a3 = 'a3';
    let a4 = 'a4';
    let a4 = 'a41';
    console.log(a4);
    for (let index = 0; index < 5; index++) {
        console.log(index);
    }
    console.log(index);
 */
  /*
   function fun(p) {
       var p = '1';
       console.log(p);
   }
   fun('0');
   */
   /*
   function fun1 (m) {
       let m = '1';
       console.log('m');
   }
   fun1('0');

更多内容请见原文，原文转载自:https://blog.csdn.net/weixin_44519496/article/details/119862192

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