lishuangzxcxc的博客

原文地址const root = { val: "A", left: { val: "B", left: { val: "D" }, right: { val: "E" } }, right: { val: "C", right: { val: "F" } }};//深度优先：前 中 后//递归function qi

数组去重数组扁平化：将多维数组变成一维数组var arr=[1,[2,[3,[4,[5]]]]]function quchong(arr){ let result=[]; for(let i=0;i<arr.length;i++){ if(Array.isArray(arr[i])){ //判断第i项是否是数组 result=result.concat(quchong(arr[i])) }else{