使用ajax传递及接收数据

前端代码：

 1     <input id="txtNum1" name="txtNum1" type="text" width="130" />
 2     <select id="fh" name="fh">
 3         <option id="jia" value="+">+</option>
 4         <option id="jian" value="-">-</option>
 5         <option id="chen" value="*">*</option>
 6         <option id="chu" value="/">/</option>
 7     </select>
 8     <input id="txtNum2" name="txtNum2" type="text" width="130" />
 9     <input id="btnSubmit" type="button" value="=" />
10     <input id="txtResult" type="text" width="130" />
11
12 @section scripts{
13     <script>
14         $(function () {
15             $("#btnSubmit").bind("click", function () {
16                 debugger
17                 $.ajax({
18                     @*url: ‘@Url.Action("JS")‘,*@
19                     url: "/Home/JS",
20                     data: {
21                         "num1": $("#txtNum1").val(),
22                         "num2" : $("#txtNum2").val(),
23                         "fh":$("#fh").val()
24                     },
25                     dataType: "json",
26                     type: "post",
27                     success: function (data){
28                         $("#txtResult").val(data.Result);
29                     },
30                     error: function (e, a){
31                         alert(a);
32                     }
33                 })
34             })
35         })
36     </script>
37 }

后台action代码：

 1 [HttpPost]
 2         public JsonResult JS(string num1, string num2,string fh)
 3         {
 4             int result = 0;
 5             try
 6             {
 7                 switch (fh)
 8                 {
 9                     case "+":
10                         result = Convert.ToInt32(num1) + Convert.ToInt32(num2); break;
11                     case "-":
12                         result = Convert.ToInt32(num1) - Convert.ToInt32(num2); break;
13                     case "*":
14                         result = Convert.ToInt32(num1) * Convert.ToInt32(num2); break;
15                     case "/":
16                         result = Convert.ToInt32(num1) / Convert.ToInt32(num2); break;
17                     default:
18                         break;
19                 }
20             }
21             catch (Exception ex)
22             {
23                 log.Error("Error", new Exception(ex.Message));
24                 return Json("");
25             }
26             var data = new { Result = result };
27             return Json(data);
28         }