0-(uninitialized) the send() method has not been called yet
1-(loading) the send() method has been called, and the request is being sent
2-(loading completed) the send() method has been executed and all the response content has been received
3 -(Interactive) The response content is being parsed
4-(Completed) The response content is parsed and can be called on the client
Five state values of readystate
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Origin blog.csdn.net/qq_43612538/article/details/109264947
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