软件说明：

AJAX driven simple chat<br/>Detailed description:<br/>This class can be used to implement a simple Web based chat system that uses AJAX to update the chat dialog display area without reloading the whole page.<br/>这类可以用来实现基于聊天系统的简单网络。此聊天系统使用AJAX更新闲谈对话显示区而无需重新调入页面<br/>The class generates a page with a Web form to submit what each chat line that the users type.<br/>这类产生 Web form形式的网页<br/>The chat lines are sent to the server using a XMLHttpRequest object.<br/>使用XMLHttpRequest对象将chat lines发到服务器<br/>The chat lines are received by a server side script that uses the class to store what each user entered in a MySQL database table.<br/>服务器端接受了chat lines，并用它来储存用户送进MySQL数据库表的数据。<br/>In response, the class outputs the chat list already formatted to by displayed in the user browser pages. <br/>相应地，在用户浏览网页时，它输出已经被格式化显示的的聊天列表。