PHP and Ajax combined to implement a small Demo of Logon verification, and phpajax combined with demo

PHP and Ajax combined to implement a small Demo of Logon verification, and phpajax combined with demo

AJAX is "Asynchronous Javascript And XML" (Asynchronous JavaScript And XML), which is a Web page development technology used to create interactive web applications.

AJAX = Asynchronous JavaScript and XML (Asynchronous JavaScript and XML ).
AJAX is not a new programming language, but a new method that uses existing standards.
AJAX is the art of exchanging data with the server and updating some webpages without reloading the entire page.

Design a user registration page. When the user enters the Registration Name, check whether the user name already exists. If yes, give a prompt

First, type index. php.

<Html> 
Welcome. php
<? Php header ("content-type: text/html; charset = gb2312"); // sleep (1); $ userId = $ _ GET ["userId"]; if ($ userId = "Administrator") {echo "user name already exists! ";}Else {echo" this user name can be registered ";}?>
I would like to introduce the knowledge of combining PHP and Ajax to implement the logon verification Demo. I hope it will be helpful to you!
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