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))；