Lite Ajax Check User name

Background operation database See https://www.cnblogs.com/zzb-yp/p/9316184.html

After completing steps 1, 2, 3, 4, 5.

6, JSP page, import JS, in JS to complete the trigger event implementation and database interaction

7, download jquery and import script/jquery-2.1.1.js, use the function of this JS

8, create script/ajax.js, in this JS to complete the function of the call, the implementation of interaction with the database and get the return object

9, create the Jsonresult class, the object returned after the interaction is returned as (State,message)

10. Controller, logic judgment in controller

11. Test Results

Lite Ajax Check User name