$(document).ready(function () {
    $.get("/api/menu/5",function (data) {
        alert(data);
        //zTreeObj = $.fn.zTree.init($("#menuTree"), setting, data);
     })
    //zTreeObj = $.fn.zTree.init($("#menuTree"), setting, zNodes);   //ztree加载
  //  var nodes = zTreeObj.getNodes()[0].children;
 
});

data是controlloer返回来的数据

下面是controller的代码

        public string Get(int id)
        {
            return "value"+id;
        }