easyui相关的问题

//某一节点下的所有子节点function getChildren(id/*节点ID*/){    var $tree = $('#tree');    var node = $tree.tree('find',id);    var childrenNodes = $tree.tree('getChildren',node.target);    return childrenNodes;}//某节点的一级节点function getSubChildren(id){    var $tree = $('#tree');    var node = $tree.tree('find',id);    var subNodes = [];    $(node.target)    .next().children().children("div.tree-node").each(function(){           subNodes.push($tree.tree('getNode',this));    });   return subNodes;}