Set the xhr callback function. xhr.onreadystatechange()
设置xhr回调函数。
I am new to XHR and am trying to solve a simple use case.
我是XHR的新手，我试图解决一个简单的用例。
If you need to pass large amounts of data back to the client, use XHR.
如果你需要向客户端返回大量数据，那么使用XHR。
If you need to pass large amounts of data back to the client, use XHR.
如果你需要向客户端返回大量数据，那么使用XHR。
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