控制textbox的最大可输入数的方法(javascript)

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前提:两个以上的按钮(或其他控件),一个textbox

在html中: 

<html>

<TR height="23">
      <TD style="WIDTH: 8px"></TD>
      <TD style="WIDTH: 136px; HEIGHT: 23px"><input id="aaaButton" style="WIDTH: 136px; COLOR: white; HEIGHT: 23px; BACKGROUND-COLOR: #555555"
        onclick="aaaButton_click()" type="button" value="aaa" runat="server" ForeColor="White" Font-Names="宋体" Font-Size="11pt"
        BackColor="#555555" CssClass="BUTTON">
      </TD>
      <TD style="WIDTH: 3px"></TD>
      <TD style="WIDTH: 52px; HEIGHT: 23px"><input id="kjButton" style="WIDTH: 52px; HEIGHT: 23px; COLOR: white; BACKGROUND-COLOR: #555555"
        onclick="KJButton_click()" type="button" value="bbb" runat="server" Font-Names="宋体" Font-Size="11pt" CssClass="BUTTON">
      </TD>
      <TD style="WIDTH: 3px"></TD>
      <TD style="WIDTH: 52px; HEIGHT: 23px">
       <input id="knButton" style="WIDTH: 52px; HEIGHT: 23px; COLOR: white; BACKGROUND-COLOR: #555555"
        onclick="KNButton_click()" type="button" value="ccc" runat="server" Font-Names="宋体"
        Font-Size="11pt" CssClass="BUTTON"></TD>
      <TD style="WIDTH: 3px"></TD>
      <TD style="WIDTH: 400px"><asp:textbox id="txtName" onkeydown="return clickOkButton()" onblur="SetOnBlur('txtCustomerName')"
        onfocus="SetOnFocus('txtCustomerName')" runat="server" Font-Names="宋体" Font-Size="11pt" BackColor="White"
        Height="23px" Width="400px" maxlength="24" Enabled="False"></asp:textbox></TD>
      <TD style="WIDTH: 8px"></TD>
     </TR>

</html>

在javascript中:

function KJButton_click(){
  document.getElementById('txtCustomerName').maxLength = 48;
}

function KNButton_click(){
  document.getElementById('txtCustomerName').maxLength = 24; 
}

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