根据元素ID遍历树形结构，查找到所有父元素ID

`
var list = [{
"orgId": 1,
"orgName": "校长办公室1",
"parentId": 0
},{
"orgId": 2,
"orgName": "校长办公室2",
"parentId": 1,
},{
"orgId": 3,
"orgName": "校长办公室3",
"parentId": 2,
}];

function findParent(idx){list.forEach(item => {if (idx === item['orgId']){let pid = item['parentId']console.log(pid)findParent(pid)}})}findParent(3);   //2 1 0

`