spring mvc后台传map，ajax回调函数不执行

悬赏园豆：20 [已解决问题] 解决于 2015-09-17 11:40

//controller
 1     @ResponseBody
 2     @RequestMapping("/login")
 3     public String login(Model model,String username,String password){            
 4         System.out.println(username+" "+password);
 5         model.addAttribute("str", "hello");
 6         model.addAttribute("res", "yes");
 7         return "aaa";                                       //string ajax可以接收
 8     }
 9     
10     @ResponseBody
11     @RequestMapping("/login2")
12     public Map<String, Object> login2(String username,String password){
13         System.out.println(username+" "+password);
14         Map<String,Object> map=new HashMap<String,Object>();
15         map.put("res", "yes");
16         return map;                                         //map ajax可以不能接收
17     }

 1       $(function() {
 2             $("#btn").click(function() {
 3                         $.post("login",{"username":"zww","password":"123"},function(data){
 4                             alert(data);  
 5                         });
 6                 });
 7 
 8             $("#btn2").click(function() {
 9                 $.post("login2",{"username":"zww2","password":"423"},function(data){
10                     alert("21");                   //不弹出
11             //        alert(data.res);
12                 });
13         });
14     });