js tree 根据子节点找到所有父节点

var acceptUnitNodes = null;//接收单位树形数据
 function  findParentNode(ids){ //ids 是子节点数组
    var parentNodes = [];//所有父节点
  var forfun = function (id,nodes) {
    for(var i=0;i<nodes.length;i++){
      var currentNode = nodes[i];
      if(currentNode.id == id){
        return currentNode.id;
      }else if(currentNode.children){
        var validNodeId = forfun(id,currentNode.children);
        if(validNodeId&&parentNodes.indexOf(validNodeId)<0){
          parentNodes.push(validNodeId)
        }
        if(validNodeId){
          return currentNode.id;
        }
      }
    }
  }
  $.each(ids,function (i,item) {
    // selectedValues.push(item);
    var validNodeId = forfun(item,acceptUnitNodes);
    if(validNodeId&&parentNodes.indexOf(validNodeId)<0){
      parentNodes.push(validNodeId);
    }
  })
   console.info(parentNodes);
  return parentNodes;
 }