JS跨域访问 控制

问题场景， 用js访问其他web资源，会出现跨域访问安全限制错误。

方案一：

参见文章： https://developer.mozilla.org/en/http_access_control

The summary is that

send extra header like

1. Origin: http://foo.example  
2. Access-Control-Request-Method: POST  

Origin is needed

Access-Control-Request-Method is needed only when POST is used

Access-Control-Request-Headers: X-PINGOTHER is needed when having special header (like X-PINGOTHER)

server can response with

Access-Control-Allow-Origin: *

that allow the response accepted by pages from other site

方案二：

让本地应用程序提供一个接口去做这个链接请求, 即通过后台程序完成。

方案三：flash 脚本

url_.text = "http://www.google.com/ig/api?hl=en-US&weather=,,,39904214,116407413";
send_BT.addEventListener(MouseEvent.CLICK,send_);
function send_(evt:Event){
var ld:URLLoader = new URLLoader();
ld.load(new URLRequest(url_.text));
ld.addEventListener(Event.COMPLETE, urlLoader_complete);
}
function urlLoader_complete(evt:Event){
log_.text = evt.target.data;
}