对 WebService 的 jQuery 调用返回“无传输"；错误 [英] jQuery Call to WebService returns "No Transport" error

问题描述

我有以下网络服务；

    [WebMethod]
    public string HelloWorld()
    {
        return "Hello World";
    }

它是标准的，没有改变类装饰器.

It's stock standard with no alterations to the class decorators.

我有这个 jQuery 方法；

I have this jQuery method;

var webMethod = "http://localhost:54473/Service1.asmx/HelloWorld"; 

$.ajax({
    type: "POST",
    contentType: "application/json; charset=utf-8",
    data: "{}",  
    dataType: "json",
    url: webMethod,
    success: function(msg){ alert(msg.d); },
    error: function (XMLHttpRequest, textStatus, errorThrown) {
        alert(errorThrown);
          }
});

这是一个发布操作，因为稍后我需要将数据发布到它.

It's a post action because later on I need to post data to it.

当我执行 jQuery 时，我得到一个无传输"错误返回.

When I execute the jQuery I get a "No transport" error returned.

我还应该提到的一件事是，jQuery 存储在我机器上的一个简单 HTML 文件中，并且 WebService 也在我的机器上运行.

One thing I should also mention is that the jQuery is stored in a simple HTML file on my machine and the WebService is running on my machine also.

HTML 页面上没有隐藏代码，它只是一个网页，而不是 C# 项目或任何东西.

There is no code behind on the HTML page it's simply a web page and not a c# project or anything.

有人能在这里指出我正确的方向吗?

Can anyone please point me in the right direction here?

推荐答案

如果你的 jQuery 页面没有从 http://localhost:54473 加载，那么这个问题可能是因为你尝试进行跨域请求.

If your jQuery page isn't being loaded from http://localhost:54473 then this issue is probably because you're trying to make cross-domain request.

更新 1看看这篇博文.

更新 2如果这确实是问题(我怀疑是)，您可能需要查看 JSONP 作为解决方案.以下是一些可以帮助您入门的链接:

Update 2 If this is indeed the problem (and I suspect it is), you might want to check out JSONP as a solution. Here are a few links that might help you get started:

• https://en.wikipedia.org/wiki/JSON
• http://remysharp.com/2007/10/08/what-is-jsonp/
• http://www.west-wind.com/weblog/posts/107136.aspx

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