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READYSTATE0 1 2 3 4..

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Author: User
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  • 0: The request was not initialized (not yet called open() ).
  • 1: The request has been established but has not yet been sent (not yet called send() ).
  • 2: The request has been sent, is in process (usually can now get the content header from the response).
  • 3: The request is in process, and some of the data in the response is usually available, but the server has not finished generating the response.
  • 4: The response is complete; you can get and use the server's response.

ReadyState change, call onreadystatechange This function, note, is this function, then we are not going to assign a function to him, rather than simply return a value.

READYSTATE0 1 2 3 4..

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