zTree实现清空选中的第一个节点的子节点

1、实现源码
<!DOCTYPE html>
<html>
<head>
	<title>zTree实现基本树</title>
	<meta http-equiv="content-type" content="text/html; charset=UTF-8">
	<link rel="stylesheet" type="text/css" href="../../../css/demo.css">
	<link rel="stylesheet" type="text/css" href="../../../css/zTreeStyle/zTreeStyle.css">
	<script type="text/javascript" src="../../../js/jquery-1.4.4.min.js"></script>
	<script type="text/javascript" src="../../../js/jquery.ztree.core-3.5.js"></script>
	<script type="text/javascript">
		<!--
		var setting = {
			data: {
				simpleData: {
					enable: true
				}
			}
		};

		var zNodes =[
			{ id:1, pId:0, name:"湖北省", open:true},
			{ id:11, pId:1, name:"武汉市", open:true},
			{ id:111, pId:11, name:"汉口"},
			{ id:112, pId:11, name:"汉阳"},
			{ id:113, pId:11, name:"武昌"},
			{ id:12, pId:1, name:"黄石市"},
			{ id:121, pId:12, name:"黄石港区"},
			{ id:122, pId:12, name:"西塞山区"},
			{ id:123, pId:12, name:"下陆区"},
			{ id:124, pId:12, name:"铁山区"},
			{ id:13, pId:1, name:"黄冈市"},
			{ id:131, pId:13, name:"黄州区"},
			{ id:132, pId:13, name:"麻城市"},
			{ id:133, pId:13, name:"武穴市"},
			{ id:134, pId:13, name:"团风县"},
			{ id:135, pId:13, name:"浠水县"},
			{ id:136, pId:13, name:"罗田县"},
			{ id:137, pId:13, name:"英山县"},
			{ id:2, pId:0, name:"湖南省", open:true},
			{ id:21, pId:2, name:"长沙市", open:true},
			{ id:211, pId:21, name:"芙蓉区"},
			{ id:212, pId:21, name:"天心区"},
			{ id:213, pId:21, name:"岳麓区"},
			{ id:214, pId:21, name:"开福区"},
			{ id:22, pId:2, name:"株洲市"},
			{ id:221, pId:22, name:"天元区"},
			{ id:222, pId:22, name:"荷塘区"},
			{ id:223, pId:22, name:"芦淞区"},
			{ id:224, pId:22, name:"石峰区"}
		];

		$(document).ready(function(){
			$.fn.zTree.init($("#baseTree"), setting, zNodes);
		});
		
		/**
		 * 清空选中的第一个节点的子节点
		 */
		function removeChildNodesTree()
		{
		    var treeObj = $.fn.zTree.getZTreeObj("baseTree");
		    //获取全部节点数据
			var nodes = treeObj.getNodes();
			for (var i=0, l=nodes.length; i < l; i++) 
			{
			    //清空选中的第一个节点的子节点
			    treeObj.removeChildNodes(nodes[i]);
			}
		}
		//-->
	</script>
 </head>

<body>
<div class="content_wrap">
	<div class="zTreeDemoBackground left">
		<ul id="baseTree" class="ztree" style="height: 300px; 200px; overflow-y: auto"></ul>
		<input type="button" id="btn" οnclick="removeChildNodesTree()" value="清空选中的第一个节点的子节点"/>
	</div>
</div>
</body>
</html>
2、实现结果
（1）初始化
（2）单击按钮
3、源码说明
//清空选中的第一个节点的子节点
treeObj.removeChildNodes(nodes[i]);