php+jquery+ajax无刷新验证用户名
php+jquery+ajax无刷新验证用户名是否已存在，要一个尽量短的例子。
[解决办法]
今天不忙，玩玩
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>Insert title here</title><script type="text/javascript" src="/js/jquery-1.4.2.min.js"></script><script type="text/javascript">$(function(){ $("#getjson").bind("click",function(){ $.ajax({ type: "POST", url: "/index.php", data: "name="+$("#username").val(), success: function(msg){ alert(msg); } }); });})</script></head><body><input type="text" id="username" /><button id="getjson">获取</button></body></html>