js 手写随机数组 洗牌算法 数组乱序

    const shuffle = arr => {
        let len = arr.length
        let rand = 0
        while (len) {
            rand = Math.floor(Math.random() * len--)
            ;[arr[len], arr[rand]] = [arr[rand], arr[len]]
        }
        return arr
    }
    console.log(shuffle([1, 2, 3, 4, 5, 6]));