<form name="form1" >
wahaha:<br>
<input type="radio" name="radiobutton" checked onclick="location='http://www.google.cn'"> one
<input type="radio" name="radiobutton" onclick="location='http://www.163.com'">  two 
<input type="radio" name="radiobutton" onclick="location='http://www.sina.com'"> three<br>请问如何让 onclick 事件发生后延迟2秒钟在跳转到相应网页?