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<script runat="server"> sub submit(sender As Object, e As EventArgs) if Page.IsValid then lbl.Text="页面有效！" else lbl.Text="页面无效！" end if end sub </script> <html> <body> <form runat="server"> 请输入 US 邮政编码： <asp:TextBox id="txtbox1" runat="server" /> <br /><br /> <asp:Button text="提交" OnClick="submit" runat="server" /> <br /><br /> <asp:Label id="lbl" runat="server" /> <br /> <asp:RegularExpressionValidator ControlToValidate="txtbox1" ValidationExpression="\d{5}" EnableClientScript="false" ErrorMessage="邮编必须是五位数字！" runat="server" /> </form> </body> </html>