http://www.oschina.net/p/xdomain
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
Simple
Library Agnostic
With jQuery  $.ajax (and subsequently $.get, $.post)
With Angular $http service
Cross domain XHR just magically works
No need to modify the server code
No need to use IE’s silly XDomainRequest Object
Easy XHR access to file servers:
Amazon
Dropbox
Includes XHook and its features
proxy.html files (slaves) may:
White-list domains
White-list paths using regular expressions (e.g. only allow API calls: /^\/api/)
Highly performant
Seamless integration with FormData

示例代码：