使用ajax传递及接收数据

前端代码：

     <input id="txtNum1" name="txtNum1" type="text" width="130" />
     <select id="fh" name="fh">
         <option id="jia" value="+">+</option>
         <option id="jian" value="-">-</option>
         <option id="chen" value="*">*</option>
         <option id="chu" value="/">/</option>
     </select>
     <input id="txtNum2" name="txtNum2" type="text" width="130" />
     <input id="btnSubmit" type="button" value="=" />
     <input id="txtResult" type="text" width="130" />

 @section scripts{
     <script>
         $(function () {
             $("#btnSubmit").bind("click", function () {
                 debugger
                 $.ajax({
                     @*url: '@Url.Action("JS")',*@
                     url: "/Home/JS",
                     data: {
                         "num1": $("#txtNum1").val(),
                         "num2" : $("#txtNum2").val(),
                         "fh":$("#fh").val()
                     },
                     dataType: "json",
                     type: "post",
                     success: function (data){
                         $("#txtResult").val(data.Result);
                     },
                     error: function (e, a){
                         alert(a);
                     }
                 })
             })
         })
     </script>
 }

后台action代码：

 [HttpPost]
         public JsonResult JS(string num1, string num2,string fh)
         {
             int result = ;
             try
             {
                 switch (fh)
                 {
                     case "+":
                         result = Convert.ToInt32(num1) + Convert.ToInt32(num2); break;
                     case "-":
                         result = Convert.ToInt32(num1) - Convert.ToInt32(num2); break;
                     case "*":
                         result = Convert.ToInt32(num1) * Convert.ToInt32(num2); break;
                     case "/":
                         result = Convert.ToInt32(num1) / Convert.ToInt32(num2); break;
                     default:
                         break;
                 }
             }
             catch (Exception ex)
             {
                 log.Error("Error", new Exception(ex.Message));
                 return Json("");
             }
             var data = new { Result = result };
             return Json(data);
         }