js随机码之乱序数组

 <!DOCTYPE html>

 <html lang="en">

 <head>

     <meta charset="UTF-8">

     <meta name="viewport" content="width=device-width, initial-scale=1.0">

     <meta http-equiv="X-UA-Compatible" content="ie=edge">

     <title>Document</title>

 </head>

 <body>

 </body>

 <script>

     var times = 100000;

     var res = {};

     for (var i = 0; i < times; i++) {

         var arr = shuffle([1, 2, 3]);

         var key = JSON.stringify(arr);

         res[key] ? res[key]++ : res[key] = 1;

     }

     // 为了方便展示，转换成百分比

     for (var key in res) {

         res[key] = res[key] / times * 100 + '%'

     }

     //ES5

     function shuffle(a) {

         var j, x, i;

         for (i = a.length; i; i--) {

             j = Math.floor(Math.random() * i);

             x = a[i - 1];

             a[i - 1] = a[j];

             a[j] = x;

         }

         return a;

     }

     //ES6

     function shuffle(a) {

         for (let i = a.length; i; i--) {

             let j = Math.floor(Math.random() * i);

             [a[i - 1], a[j]] = [a[j], a[i - 1]];

         }

         return a;

     }

     console.log(res)

 </script>

 </html>
巴特西

js随机码之乱序数组

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