如何验证邮编文本框不能输入字母

名为Validate.js的javascirpt文件
function checkData()
{
    var zip = document.getElementById("Zip").value
   
    if(/^[1-9]\d*$/.test(zip))
    {
    }
    else
    {
        alert("You couldn't enter the letter!");
    }
}
html端代码
<html>
<head runat="server">
      <title>Untitled Page</title>
      <script language="javascript" type="text/javascript" src="Validate.js"></script>    
</head>
<body>
      <form id="form1" runat="server">
            <div>
                  <center>
                        <table>
                              <tr>
                                    <td>
                                          Zip Code
                                    </td>
                                    <td>
                                          <asp:TextBox ID="Zip" runat="server" onblur="checkData()"></asp:TextBox>
                                    </td> 
                              </tr>
                        </table> 
                  </center>
            </div>
      </form>
</body>
</html>

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