js/elementui 树形结构数据转化（后台平铺返回）

// 后端返回格式
var data = [
	{"id":2,"name":"aaa","pid":null},
	{"id":3,"name":"bbb","pid":2},
	{"id":5,"name":"ccc","pid":2},
	{"id":100,"name":"ddd","pid":2},
	{"id":6,"name":"eee","pid":2},
	{"id":601,"name":"fff","pid":6},
	{"id":602,"name":"ggg","pid":6},
]
//