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Pure js USES ajax to determine whether a user name

Time：12-18

Js to realize the user registration form, using AJAX technology to detect whether the user name being used,
Such as user name is not occupied, put a check mark next to the text box. If already occupy a fork, and display the text "occupied",
User name exists data. Js file, create at least 10 users,

The zha write ah, this pure js

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