js隨機碼之亂序數組
阿新 • • 發佈：2017-10-30
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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 // 為了方便展示，轉換成百分比 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>
js隨機碼之亂序數組