One of the major constraints of Ajax is the notorious same origin policy.

Ajax 的一个主要不足就是为人诟病的同源策略。

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Being a Web application, our example is limited by the same origin policy enforced by all browsers.

作为一个Web应用程序，我们的示例也受限于目前所有浏览器均执行的同源策略。

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Modern browsers use a same origin policy that only permits subsequent requests to be issued to the same domain where the page originated.

现代浏览器使用一种同源策略，只允许将后续请求发送给发出页面的相同域。

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