如何随机化(随机播放)JavaScript 数组?

How to randomize (shuffle) a JavaScript array?(如何随机化(随机播放)JavaScript 数组?)

问题描述

我有一个这样的数组:

var arr1 = ["a", "b", "c", "d"];

如何随机化/随机播放?

How can I randomize / shuffle it?

推荐答案

事实上的无偏洗牌算法是 Fisher-Yates (aka Knuth) Shuffle.

The de-facto unbiased shuffle algorithm is the Fisher-Yates (aka Knuth) Shuffle.

您可以在这里看到 很棒的可视化(以及原帖 链接到这个)

You can see a great visualization here (and the original post linked to this)

function shuffle(array) {
  let currentIndex = array.length,  randomIndex;

  // While there remain elements to shuffle...
  while (currentIndex != 0) {

    // Pick a remaining element...
    randomIndex = Math.floor(Math.random() * currentIndex);
    currentIndex--;

    // And swap it with the current element.
    [array[currentIndex], array[randomIndex]] = [
      array[randomIndex], array[currentIndex]];
  }

  return array;
}

// Used like so
var arr = [2, 11, 37, 42];
shuffle(arr);
console.log(arr);

更多信息关于所使用的算法.

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