JavaScript - 随机获取数组元素

1.应用场景

随机获取数组元素.

2.学习/操作

1.随机获取数组一个元素

var items = ['1','2','4','5','6','7','8','9','10'];
var item = items[Math.floor(Math.random()*items.length)];

JavaScript - 随机获取数组元素

2.随机获取几个元素

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) );

截图：

JavaScript - 随机获取数组元素

后续补充

...

3.问题/补充

TBD

4.参考

https://www.cnblogs.com/doseoer/p/5728955.html //js随机从数组中取出几个元素

后续补充

...