数组乱序

  function shuffle(arr) {
    let m = arr.length
    while (m > 1) {
      let index = Math.floor(Math.random() * m--)
      ;[arr[m], arr[index]] = [arr[index], arr[m]]
    }
    return arr
  }
复制代码

转载于:https://juejin.im/post/5d00c89d6fb9a07eb94f8487