jQuery zTree 异步加载添加子节点重复问题

zTree 简介

    zTree 是一个依靠 jQuery 实现的多功能 “树插件”。优异的性能、灵活的配置、多种功能的组合是 zTree 最大优点。

    zTree 是开源免费的软件（MIT 许可证）。如果您对 zTree 感兴趣或者愿意资助 zTree 继续发展下去，可以进行捐助。

原始问题

//添加结点, 产品和版本function addNode(event) {  rMenu.css({ "visibility": "hidden" });  var treeNode = zTree.getSelectedNodes()[0];  var pid;  var nodeName;  var treelevel;  if (!treeNode && event.target.tagName.toLowerCase() != "button" && $(event.target).parents("a").length == 0) {   //添加产品结点pid = 0;   treeNode = null;   treelevel = 1;  } else if (treeNode) {   //添加版本结点pid = treeNode.id;  treelevel = 2;  }  $.post(   "AddNode.action",   { type: treelevel, id: pid },   function(nodeIdAndName) {    var params = /([^/|]+)/|([^/|]+)/.exec(nodeIdAndName);    if (!((!treeNode && event.target.tagName.toLowerCase() != "button" && $(event.target).parents("a").length == 0) || treeNode.open)) {     zTree.expandNode(treeNode, true);    }    treeNode = zTree.addNodes(treeNode, { id: params[1], pid: pid, isParent: "true", name: params[2], editable: "true", treelevel: treelevel });   });}

原本直接添加子节点的时候，如果父节点没有展开，会添加两个一样的子节点（第一次的时候）；后来我对父节点是否展开进行了判断，但是却变成了如果父节点展开，会添加两个一样的子节点（第一次的时候），这个问题要怎么解决呢？

办法一 

将

if (!((!treeNode && event.target.tagName.toLowerCase() != "button" && $(event.target).parents("a").length == 0) || treeNode.open)) {     zTree.expandNode(treeNode, true);    }    treeNode = zTree.addNodes(treeNode, { id: params[1], pid: pid, isParent: "true", name: params[2], editable: "true", treelevel: treelevel });

改成

if(!treeNode && event.target.tagName.toLowerCase() != "button" && $(event.target).parents("a").length == 0)    {     treeNode = zTree.addNodes(treeNode, { id: params[1], pid: pid, isParent: "true", name: params[2], editable: "true", treelevel: treelevel });    }    else if(treeNode.open)    {     if(treeNode.isParent)     {      zTree.reAsyncChildNodes(treeNode, "refresh");     }     else     {      treeNode.isParent=true;      zTree.reAsyncChildNodes(treeNode, "refresh");     }    }    else    {     zTree.expandNode(treeNode, true);     treeNode = zTree.addNodes(treeNode, { id: params[1], pid: pid, isParent: "true", name: params[2], editable: "true", treelevel: treelevel });    }