JavaScript 一维数组转二维数组

题目描述：

<script>const num = [1,2,3,4]const out = (function(num,m,n){if(num.length !== m*n){return []}const newarr = []for(let i =0;i<m;i++){newarr.push(num.slice(i*n,(i+1)*n))}return newarr})(num,2,2)console.log(out)</script>

不使用String类属性的方法

/*** @param {number[]} original* @param {number} m* @param {number} n* @return {number[][]}*/
var construct2DArray = function(original, m, n) {const newarr = []if(original.length !== m*n){return newarr}for(let i =0;i<original.length;){for(let j=0;j<m;j++){let teparr = []for(let k=0;k<n;k++){teparr.push(original[i])i++}newarr.push(teparr)}}return newarr};