本教程是一款利用了ajax php在用户输入完用户名后，就会发送请求给php程序，然后查询数据，判断用户要注册的用户名是不是己经注册或存在重复了，及时的返回提示信息，以免用户填写了一大填表单后，突然提供用户名不能注册己被注册了，这样体验就不好了。本教程就是专门解决这个问题了，能快速的告诉你要注册的用户名是否可以注册。
ajax+php教程验证用户名重复代码实例
/*
本教程是一款利用了ajax php在用户输入完用户名后，就会发送请求给php程序，然后查询数据，判断用户要注册的用户名是不是己经注册或存在重复了，及时的返回提示信息，以免用户填写了一大填表单后，突然提供用户名不能注册己被注册了，这样体验就不好了。本教程就是专门解决这个问题了，能快速的告诉你要注册的用户名是否可以注册。
*/
?>
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