flat就行了，示例代码如下：
let arr = [1, [2, 3, [4, 5], 6, [7, [8, [9, [10]]]]]]; //多维数组
let arr2 = [[1, 2, 3], [4, 5, 6], [7, 8], 9] //二维数组
console.log(arr.flat(Infinity)); //结果 [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
console.log(arr2.flat(Infinity)); //结果 [1, 2, 3, 4, 5, 6, 7, 8, 9]
console.log(arr.flat(3)); //结果 [1, 2, 3, 4, 5, 6, 7, 8, [9, [10]]]
console.log([1, 2,, 4, 5].flat()); //结果 [1, 2, 4, 5] 它可以去除空值
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