jsp页面通过$.ajax请求java后台，但是页面跳转了

Question

js代码：

 function sendForm() {
        alert("12345"), $.ajax({
            type : "get",
            url : "code/checkcode",
            data : {
                "codeNum" : $("#codeNum")
            },
            dataType : "json",
            success : function(data) {
                alert("123");
            },
            error : function(data) {
                alert(data);
            }
        });
    }

java代码：

 @RequestMapping(value = "checkcode", method = RequestMethod.GET)
    @ResponseBody
    public Map<String, Object> checkCode(Code code, HttpServletResponse resp) {
        resp.addHeader("Content-Type", "application/json");
        Map<String, Object> map = codeService.checkCode(code.getCodeNum());
       return map;
    }

Answer 1