佟舟的博客

let a = [1, [2, 3], [4, [5, [6, 7, 8]]], [9, 10]]; 1、ES6方法 let aRes= a.flat(Infinity); 2、for循环 递归 function flatten(arr) { var res = []; for (let i = 0, length = arr.length; i < length; i++) { if (Array.isArray(arr[i])) { res = [...res,