登录不成功后能否弹出个小窗口来？？？？？
我在主页面上放了个登录按钮想在登录不成功时弹出个小窗口来，上面显示“登录不成功，xxxxx秒后跳转到登录页面”，并且秒钟数字能倒数，怎么做？？？

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Response.Write( " <script> alert(\ "注册成功\ "); </script> ");
Response.Write( " <script> window.location= 'index.aspx '; </script> ");
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<div> 系统将于 <span id= "BackSecs " style= "color: #F00; "> </span> 秒后自动跳转到登陆页面...如果长时间没有跳转 <a href= "xxx.aspx "> 请点击 </a>
<script> function countDown(Secs) {
BackSecs.innerText=Secs;
if(Secs> 0) {
setTimeout( "countDown( "+Secs+ "-1) ",800);
}
else {
window.location= "xxx.aspx ";

}
}
countDown(5);
</script>
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可以的，你可以直接注册客户端脚本，alert( "..... ")
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<script laungage= "javascript ">
function check()
{ var user_name=document.getElementById( "username ").value
var pwd=document.getElementById( "pwd ").value

if (user_name.value== " ")
{
alert( "用户名不能为空! ");
return false;
}
if (pwd.value== " ")
{
alert( "密码不能为空! ");
return false;
}
}
</script>

<form id= "form1 " name= "form1 " method= "post " onsubmit= "return check() ">

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