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<%@ Page Language="C#" %>
<script type="text/javascript">
function ok()
{
if(document.getElementById("key").value=="")
{
alert("错误");
}
}
</script>
<script runat="server">
private void Page_Init(object sender, EventArgs e)
{
Response.Write("document.write('<form name=form1 action=manageclass.aspx method=post><input name=key type=text id=key><input type=submit name=Submit value=提交 OnClick=javascript:ok()></form>');");
}
</script>