MiniUI treeGrid 树节点展开和不展开的性能差别很大

参考API：

http://miniui.com/docs/api/index.html#ui=datagrid

http://miniui.com/docs/api/index.html#ui=treegrid

Mini所有节点配置数据方式（集合数组——没有构造成树的数据结构）：

1.1. MiniUI测试树结构全部加载效率测试-8s左右

1.2. MiniUI测试树结构全部加载仅展开根节点-150ms左右

1.2.3实现HTML示例代码

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title>TreeGrid 树形表格</title>
    <meta http-equiv="content-type" content="text/html; charset=UTF-8" /><link href="../demo.css" rel="stylesheet" type="text/css" />

    <script src="../../scripts/boot.js" type="text/javascript"></script>
    
</head>
<body>
    <h1>TreeGrid 巡护员树测试</h1>
    <input type="button" value="测试" onclick="reload()"/>
<div id="treegrid1" class="mini-treegrid" style="100%;height:580px;"     
    url="../data/xht_tree.json"  showTreeIcon="false" 
    treeColumn="taskname" idField="id" parentField="parentId" resultAsTree="false"  
    allowResize="true" expandOnLoad="false"
>
    <div property="columns">
        <div type="indexcolumn"></div> 
        <div name="taskname" field="name" width="160" >巡护员</div>
        <div field="value" width="80">操作</div>             
    </div>
</div>
 <script type="text/javascript">
       function reload(){
           mini.parse();

           var treegrid = mini.get("treegrid1");
           treegrid.url="../data/xht_tree.json?res="+Math.random();
           var start=new Date().getTime();
           console.info("reload....");
           treegrid.loading();
           treegrid.load();
           var node=treegrid.getRow(0);
           treegrid.expandNode(node);
           treegrid.unmask();
           var end=new Date().getTime();
           console.info("completed time:"+(end-start)+"ms");
       }
        
  </script>

</body>
</html>

异步加载方式参考：http://www.blogjava.net/grid/archive/2012/12/13/392948.html