TreeView.getTreeNode()步骤报错object doesn't support this property or methods

TreeView.getTreeNode()方法报错object doesn't support this property or methods.

JScript code

         var TreeView;         function this_ondocumentready()         {        TreeView = element.all(id + "_TreeFilter");         }         function SyncTree()    {            [color=#FF0000]var treeAnd = TreeView .getTreeNode("0");[/color]        treeAnd.setAttribute("Root", "true");        treeAnd.setAttribute("BoolType", "And");        var xFilter = xmlTree.selectSingleNode("//Filter");        if( null == xFilter )        {            xFilter = xmlTree.createElement("Filter");            if( xmlTree.hasChildNodes )                xmlTree.firstChild.appendChild(xFilter);            else                xmlTree.appendChild(xFilter);                }        var xAnd = xmlTree.selectSingleNode("//Filter/And");        if( null == xAnd )        {            xAnd = xmlTree.createElement("And");            xFilter.appendChild(xAnd);                }                SyncNode( xAnd, treeAnd);        TreeView.selectedNodeIndex = txtSelectedNode.value;    }

各位前辈，小弟在做一个二次开发项目，遇到这个问题，很纠结！
TreeView 应该是个全局的吧，在好多方法中都有用到。也可以获取到这个控件的ID。
var treeAnd = TreeView .getTreeNode("0");这边报错object doesn't support this property or methods.
小弟新手，分不多，希望各位前辈指教!

[解决办法]
网站根目录下需要有 webctrl_client 这个文件夹 有树运行需要的htc文件等

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