Ajax与asp.net aspx返回未定义

Question

我面临以下问题：每当我点击button时，alert显示undefined。

Web方法：

[WebMethod] 
    public static string getTest() 
    { 
     return "testing success"; 
    } 

阿贾克斯脚本

<script type="text/javascript"> 
     function getTest() { 
      $.ajax({ 
       type: "POST", 
       url: "main.aspx/getTest", 
       data: "{}", 
       datatype: "json", 
       contenttype: "/application/json; charset=utf-8", 
       success: function (msg) { 

        alert(msg.d); 

       }, 
       error: function (data) { 
       } 
      }); 
     } 
    </script> 

Answer 1

datatype应该dataType和contenttype应该contentType。也从"/application/json; charset=utf-8"开始"/application/json; charset=utf-8"

$.ajax({ 
      type: "POST", 
      url: "main.aspx/getTest", 
      data: "{}", 
      dataType: "json", 
      contentType: "application/json; charset=utf-8", 
      success: function (msg) { 

       alert(msg.d); 

      }, 
      error: function (data) { 
      } 
     }); 

Answer 2

从Ajax调用

datatype: "json", 
contenttype: "/application/json; charset=utf-8", 

更多关于这些

删除这些点

Differences between contentType and dataType in jQuery ajax function

What is content-type and datatype in an AJAX request?

你可以找到更多的细节在jQuery Ajax documentation