<script type="text/javascript">
var zTreeObj;
var setting ={
showLine: true,
checkable: true,
asyncParam: ["name"]
};
var zNodes=[{ name:"手机", open:false, checked:true,
nodes: [
{ name:"诺基亚", isParent:true},
{ name:"三星"},
{ name:"索爱"},
{ name:"多普达"}
]},
{ name:"电脑", open:true, checked:true,
nodes: [
{ name:"硬件", checked:true},
{ name:"整机", isParent:true, checked:true},
{ name:"网络", checked:true}
]},
{ name:"家电", open:false,
nodes: [
{ name:"电视",url:"http://www.baidu.com",target:"_blank", checked:true},
{ name:"冰箱"},
{ name:"空调", isParent:true}
]}];
$(document).ready(function () {
zTreeObj = $("#treeDemo").zTree(setting,zNodes);
});
</script>

请检查 css img 文件的相对路径是否正确，检查 css 样式是否有冲突。

去看看