XMLHttpRequest 无法使用 jQuery 加载 URL [英] XMLHttpRequest cannot load an URL with jQuery
问题描述
我正在尝试从远程"网站获取一些 json 数据.我在 99000 端口上运行我的 Web 服务，然后在 99001 端口 (http://localhost:99001/index.html) 上启动我的网站.
I'm trying to get some json data from a "remote" website. I run my web service on the 99000 port then, I launch my website on the 99001 port (http://localhost:99001/index.html).
我收到以下消息:
XMLHttpRequest cannot load http://localhost:99000/Services.svc/ReturnPersons. Origin http://localhost:99001 is not allowed by Access-Control-Allow-Origin.
即使我以 HTML 文件的形式启动我的网页，我也会得到这个:
Even If I launch my web page as an HTML file, I get this:
XMLHttpRequest cannot load http://localhost:99000/Services.svc/ReturnPersons.Origin null is not allowed by Access-Control-Allow-Origin.
Web 服务返回数据.我尝试捕捉这样的数据项:
The web service returns data. I try to catch the data items like this:
var url = "http://localhost:99000/Services.svc/ReturnPersons";
$.getJSON(url, function (data) {
success: readData(data)
});
function readData(data) {
alert(data[0].FirstName);
}
我正在尝试获得这种结构:
And I'm trying to get this structure:
[{"FirstName":"Foo","LastName":"Bar"},{"Hello":"Foo","LastName":"World"}]
你知道我为什么会收到这个错误吗?
Do you know why I'm getting this error?
推荐答案
你不能做一个 XMLHttpRequest 跨域，唯一的选项"是一种叫做 JSONP 的技术，归结为:
You can't do a XMLHttpRequest crossdomain, the only "option" would be a technique called JSONP, which comes down to this:
开始请求:添加一个带有远程 url 的新
