<script language="VBScript">
Dim oTime : oTime = 60
Function STime
document.all("oInput").value = "00:00:" & oTime
If oTime>0 Then
oTime = oTime - 1
window.setTimeout "STime", 1000
Else
MsgBox "时间到了!"
End If
End Function
Sub Window_Onload
Call STime
End Sub
</script>
<input id="oInput" type="text">