这篇文章为转载，我的需求是从题库中，随机抽几道题，作为新试卷。代码如下：

var items = ['1','2','4','5','6','7','8','9','10'];

1.从数组items中随机取出一个元素

var item = items[Math.floor(Math.random()*items.length)];

2.从前面的一篇随机数组中随机取几个元素

function getRandomArrayElements(arr, count) {var shuffled = arr.slice(0), i = arr.length, min = i - count, temp, index;while (i-- > min) {index = Math.floor((i + 1) * Math.random());temp = shuffled[index];shuffled[index] = shuffled[i];shuffled[i] = temp;}return shuffled.slice(min);
}
var items = ['1','2','4','5','6','7','8','9','10'];
console.log( getRandomArrayElements(items, 4) );