效果图：
代码：
<!DOCTYPE html> <HTML> <HEAD> <TITLE> ZTREE DEMO - one root</TITLE> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> <link rel="stylesheet" href="../../../css/demo.css" type="text/css"> <link rel="stylesheet" href="../../../css/zTreeStyle/zTreeStyle.css" type="text/css"> <script type="text/javascript" src="../../../js/jquery-1.4.4.min.js"></script> <script type="text/javascript" src="../../../js/jquery.ztree.core.js"></script> <!-- <script type="text/javascript" src="../../../js/jquery.ztree.excheck.js"></script> <script type="text/javascript" src="../../../js/jquery.ztree.exedit.js"></script>--> <SCRIPT type="text/javascript"> <!-- var setting = { view: { dblClickExpand: dblClickExpand }, data: { simpleData: { enable: true } } }; var zNodes =[ { id:1, pId:0, name:"根 Root", open:true}, { id:11, pId:1, name:"父节点 1-1", open:true}, { id:111, pId:11, name:"叶子节点 1-1-1"}, { id:112, pId:11, name:"叶子节点 1-1-2"}, { id:113, pId:11, name:"叶子节点 1-1-3"}, { id:114, pId:11, name:"叶子节点 1-1-4"}, { id:12, pId:1, name:"父节点 1-2", open:true}, { id:121, pId:12, name:"叶子节点 1-2-1"}, { id:122, pId:12, name:"叶子节点 1-2-2"}, { id:123, pId:12, name:"叶子节点 1-2-3"}, { id:124, pId:12, name:"叶子节点 1-2-4"}, { id:13, pId:1, name:"父节点 1-3", open:true}, { id:131, pId:13, name:"叶子节点 1-3-1"}, { id:132, pId:13, name:"叶子节点 1-3-2"}, { id:133, pId:13, name:"叶子节点 1-3-3"}, { id:134, pId:13, name:"叶子节点 1-3-4"} ]; function dblClickExpand(treeId, treeNode) { return treeNode.level > 0; } $(document).ready(function(){ $.fn.zTree.init($("#treeDemo"), setting, zNodes); }); //--> </SCRIPT> <style type="text/css"> .ztree li span.button.switch.level0 {visibility:hidden; width:1px;} .ztree li ul.level0 {padding:0; background:none;} </style> </HEAD> <BODY> <h1>冻结根节点</h1> <h6>[ 文件路径: super/oneroot.html ]</h6> <div class="content_wrap"> <div class="zTreeDemoBackground left"> <ul id="treeDemo" class="ztree"></ul> </div> <div class="right"> <ul class="info"> <li class="title"><h2>实现方法说明</h2> <ul class="list"> <li>对于这种只有一个根节点，且不显示 +/- 开关的需求，需要利用 css、setting 配合使用</li> <li class="highlight_red">zTree v3.x 可以针对指定的 level，进行样式设定，请查看本页面源码，查看 css 设置</li> <li class="highlight_red">设置 setting.view.dblClickExpand 指向 Function，可以只针对根节点关闭双击展开的操作</li> </ul> </li> </ul> </div> </div> </BODY> </HTML>
