XDomain 介绍
XDomain 是 JavaScript CORS 跨域请求的一个替代产品，无需任何服务器端的配置。只需要在同域下放置一个 proxy.html
文件即可。该库利用 XHook 来获取所有 XHR，可以无缝的和其他库协同工作。
Features
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Simple
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Library Agnostic
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Cross domain XHR just magically works
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No need to modify the server code
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No need to use IE’s silly XDomainRequest Object
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Easy XHR access to file servers:
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proxy.html files (slaves) may:
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White-list domains
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White-list paths using regular expressions (e.g. only allow API calls: /^\/api/)
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Highly performant
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Seamless integration with FormData
示例代码：
//do some vanilla XHR
var xhr = new XMLHttpRequest();
xhr.open('GET', 'http://xyz.example.com/secret/file.txt');
xhr.onreadystatechange = function(e) {
if(xhr.readyState === 4)
alert(xhr.responseText);
};
xhr.send();
//or if we are using jQuery...
$.get('http://xyz.example.com/secret/file.txt').done(function(data) {
console.log("got result: ", data);
});