//扩展tree, 增加getLevel方法
$.extend($.fn.tree.methods, {
getLevel:function(jq,target){
var l = $(target).parentsUntil("ul.tree","ul");
return l.length+1;
}
});
//用法
var selTreeNode = $('#typeTree').tree('getSelected');
var lv = $("#typeTree").tree("getLevel",selTreeNode.target);