1 <!DOCTYPE html>
2 <html lang="en">
3
4 <head>
5 <meta charset="UTF-8">
6 <meta name="viewport" content="width=device-width, initial-scale=1.0">
7 <meta http-equiv="X-UA-Compatible" content="ie=edge">
8 <title>Document</title>
9 </head>
10
11 <body>
12
13 </body>
14 <script>
15 var times = 100000;
16 var res = {};
17
18 for (var i = 0; i < times; i++) {
19 var arr = shuffle([1, 2, 3]);
20
21 var key = JSON.stringify(arr);
22 res[key] ? res[key]++ : res[key] = 1;
23 }
24
25 // 为了方便展示，转换成百分比
26 for (var key in res) {
27 res[key] = res[key] / times * 100 + '%'
28 }
29
30 //ES5
31 function shuffle(a) {
32 var j, x, i;
33 for (i = a.length; i; i--) {
34 j = Math.floor(Math.random() * i);
35 x = a[i - 1];
36 a[i - 1] = a[j];
37 a[j] = x;
38 }
39 return a;
40 }
41
42
43 //ES6
44 function shuffle(a) {
45 for (let i = a.length; i; i--) {
46 let j = Math.floor(Math.random() * i);
47 [a[i - 1], a[j]] = [a[j], a[i - 1]];
48 }
49 return a;
50 }
51
52 console.log(res)
53 </script>
54
55
56 </html>
