使用两个zTree，调用一个onCheck函数，分别展开不同的节点

 1  function onCheck(e, treeId, treeNode) {
 2             console.log(treeId);
 3             //清空所有已选人员
 4             $("#yxChk").html("");
 5             zTree = $.fn.zTree.getZTreeObj("treeUser");
 6             //保存部门人员
 7             GetNodes();
 8             if (treeId == "treeUser") {
 9                 zTree.expandNode(treeNode, true, true, true);
10             } else {
11                 zGroupTree = $.fn.zTree.getZTreeObj("treeGroupUser");
12                 zGroupTree.expandNode(treeNode, true, true, true);
13             }
14         }