jQuery的阿贾克斯导致不确定 [英] jQuery Ajax results in undefined

问题描述

我有一个简单功能只从服务器向客户机返回一个翻译的消息。但结果表明不确定的，当我通过结果变成变种。

I have a simple function which only returns a translated message from the server to the client. But the result shows undefined, when I pass the result into a var.

function MessageNoResult() {
  $.ajax(
  {
    type: "POST",
    async: true,
    url: '<%= ResolveUrl("~/WebMethods.aspx/MessageNoResult") %>',
    contentType: "application/json; charset=utf-8",
    dataType: "json",
    success: function(msg) {
      return msg.d;
    }
  });
}

结果 - >未定义（坏）

var message = MessageNoResult();
alert(message); 

当我看着页眉它给了我：

When I look into the Headers it gives me:

Server  ASP.NET Development Server/9.0.0.0
Date    Wed, 09 Nov 2011 09:01:31 GMT
X-AspNet-Version    2.0.50727
Cache-Control   private, max-age=0
Content-Type    application/json; charset=utf-8
Content-Length  24
Connection  Close

Response {"d":"No search result"}
JSON d "No search result"

为什么我仍然得到一个不确定的结果？

Why do I still get an undefined result?

推荐答案

您可以传递一个回调函数的 MessageNoResult 功能

You can pass a callback function to the MessageNoResult function

function MessageNoResult(callback) {
  $.ajax(
  {
    type: "POST",
    async: true,
    url: '<%= ResolveUrl("~/WebMethods.aspx/MessageNoResult") %>',
    contentType: "application/json; charset=utf-8",
    dataType: "json",
    success: function(msg) {
      callback(msg);
    }
  });
}

然后调用：

MessageNoResult(function(msg) {
    alert(msg.d);
});

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