<div id="dd0" class="clip" style="display:block;">
<div class="dTreeNode" ">
<div class="dTreeNode" ">
<div class="dTreeNode" ">
<div class="dTreeNode" ">
<div class="dTreeNode" ">
<div class="dTreeNode" 
   <div class="dTreeNode">
   <div class="dTreeNode">
   <div class="dTreeNode">
<--这三个不想取到-->
</div>
<div class="dTreeNode">
<div class="dTreeNode">
<div class="dTreeNode">
<div class="dTreeNode">
<div class="dTreeNode">
<div class="dTreeNode">
<div class="dTreeNode">
<div class="dTreeNode">
<div class="dTreeNode">
<div class="dTreeNode">如上,只想去id为dd0下面的第一层子节点,嵌套的3个不想取,怎么做