# 如何实现一个 sampleSize 函数，从数组中随机取 N 个元素
Issue
欢迎在 Gtihub Issue 中回答此问题: Issue 696 (opens new window)
Author
const shuffle = (list) => list.sort((x, y) => Math.random() - 0.5);
const sampleSize = (list, n) => shuffle(list).slice(0, n);
Author
Array.prototype.sampleSie = function (size) {
const result = [];
const tmp = [...this];
const len = tmp.length;
for (let i = 0; i < size && i < len; i++) {
const index = Math.floor(Math.random() * tmp.length);
result[i] = tmp.splice(index, 1)[0];
}
return result;
};