<!DOCTYPE html> <html lang="zh"> <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>随机取数组中的几个元素</title> </head> <body> <script type="text/javascript"> function getRandomArrayElements(arr, count) { var random = arr.slice(0), i = arr.length, min = i - count, temp, index; while (i-- > min) { index = Math.floor((i + 1) * Math.random()); temp = random[index]; random[index] = random[i]; random[i] = temp; } return random.slice(min); } var items = ['1','2','4','5','6','7','8','9','10']; console.log( getRandomArrayElements(items, 4) ); </script> </body> </html>
