ztree获取节点对象?急...

var setting = {

data: {
simpleData: {
enable: true
}
},

callback: {

onClick: onClick
}
};
function onClick(event, treeId, treeNode,clickFlag) {
alert(treeNode.tId + ", " + treeNode.name);//点击直接返回节点对象treeNode
var zTree = $.fn.zTree.getZTreeObj("treeDemo");
//var nodes = zTree.getNodes();
var nodes = zTree.getSelectedNodes();
alert(nodes[0].name);//返回被选中节点对象
};