This handler function was then assigned to the onreadystatechange property.

然后把这个事件处理函数分配给onreadystatechange属性。

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Notice that we registered a handler (by setting the req. onreadystatechange property).

注意，我们注册了一个处理程序(通过设置req . onreadystatechange属性)。

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The server looks at the onreadystatechange property and figures out what method to call.

服务器查看onreadystatechange属性确定要调用的方法。

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