js随机从数组中取出几个元素

JS如何从一个数组中随机取出一个元素或者几个元素。

假如数组为

var items = ['1','2','3','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) );

 

转载于:https://www.cnblogs.com/hjsblogs/p/10345003.html