客户端页面index.html !DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" html xmlns="http://www.w3.org/1999/xhtml" head titleajax测试用户名是否存在/title script language="javascript" type="text/javascript" //生成Http请求对象,用于客户端向服务/端发送异步的http请求 function getHttpObject() { var http; var br...[ 查看全文 ]