<html>
<body>
<script type="text/javascript">
function ajaxFunction()
{
var xmlHttp;
try
{
// Firefox, Opera 8.0+, Safari
xmlHttp=new XMLHttpRequest();
}
catch (e)
{
// Internet Explorer
try
{
xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
}
catch (e)
{
try
{
xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
}
catch (e)
{
alert("您的浏览器不支持AJAX！");
return false;
}
}
}
xmlHttp.onreadystatechange=function()
{
if(xmlHttp.readyState==4)
{
document.myForm.time.value=xmlHttp.responseText;
// document.myForm.time1.value=xmlHttp.responseText;//这个为隐藏域,这样既有明文提示,又易在提交表单时用脚本判断.
}
}
xmlHttp.open("GET","time.asp?action=2",true);
xmlHttp.send(null);
}
</script>
<form name="myForm">
用户: <input type="text" name="username" onkeyup="ajaxFunction();" />
时间: <input type="text" name="time" />
</form>
</body>
</html>
下面是time.asp
<%
'---------time.asp-------------------------
response.expires=-1
Action = LCase(Request("action"))
Select Case Trim(Action)
Case "1"
Call f1()
Case Else
Call f2()
End Select
Sub f1()
response.write(time)
End Sub
Sub f2()
response.write("f2")
End Sub
%>
实际使用时,只要将文本框设为hidden,即可在点击提交按钮时,判断这个隐藏表单项的值,从而判断是否有重名
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