Ajax login username verification
Introduction
update time：2018-01-12ajax function:
When the user fills in the account and switches to the password box, use ajax to verify the availability of the account. The verification method is as follows: first create an XMLHTTPRequest object, then send the information that needs to be verified (user name) to the server for verification, and finally determine whether the user name is available based on the status returned by the server.
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