JavaScript中随机打乱一个数组

    function shuffle(arr) {
        let i = arr.length;
        while (i) {
            let j = Math.floor(Math.random() * i--);
            [arr[j], arr[i]] = [arr[i], arr[j]];
        }
    }

    let arr = [1, 2, 3, 4, 5, 6, 7]
    shuffle(arr)
    console.log(arr)