json转换为tree对象（递归）

  const newTeam = function (data, parentId) {

 2             let itemArr = [];

 3             for (let i = 0; i < data.length; i++) {

 4                 let node = data[i];

 5                 if (node.parent_id === parentId) {

 6                     let newNode = {};

 7                     newNode.id = node.id;

 8                     newNode.name = node.name;

 9                     newNode.parent_id = node.parent_id;

10                     newNode.children = newTeam(data, node.id);

11                     itemArr.push(newNode);

12                 }

13             }

14             return itemArr;

15         }

 //teamDate 后台传过来的json ，null 第一级的parent_id为null

 console.log(newTeam(teamDate, null))；