题目：
source = [{id: 1,pid: 0,name: 'body'}, {id: 2,pid: 1,name: 'title'}, {id: 3,pid: 2,name: 'div'}]转换为: [{id: 1,pid: 0,name: 'body',children: [{id: 2,pid: 1,name: 'title',children: [{id: 3,pid: 1,name: 'div'}]}}]
代码实现：
<!DOCTYPE html><html lang="en"><head><meta charset="UTF-8"><meta name="viewport" content="width=`, initial-scale=1.0"><meta http-equiv="X-UA-Compatible" content="ie=edge"><title>toTree</title></head><body><script>var source = [{id: 1,pid: 0,name: 'body'}, {id: 2,pid: 1,name: 'title'}, {id: 3,pid: 1,name: 'div'}, {id: 4,pid: 3,name: 'span'}, {id: 5,pid: 3,name: 'icon'}, {id: 6,pid: 4,name: 'subspan'}]function toTree(data) {let result = []if(!Array.isArray(data)) {return result}data.forEach(item => {delete item.children;});let map = {};data.forEach(item => {map[item.id] = item;});data.forEach(item => {let parent = map[item.pid];if(parent) {(parent.children || (parent.children = [])).push(item);} else {result.push(item);}});return val;}console.log(toTree(source))</script></body></html>
