[javascript]
<script language=“javascript” type=“text/javascript”>
function countNum（）
{
var count=document.getElementById（“txtText”）。value.length;
document.getElementById（“lblCount”）。value=count;
}
</script>
<script language=“javascript” type=“text/javascript”>
function countNum（）
{
var count=document.getElementById（“txtText”）。value.length;
document.getElementById（“lblCount”）。value=count;
}
</script>[csharp] view plaincopyprint? <asp:TextBox ID=“txtText” name=“txtText” runat=“server” Columns=“80” Rows=“8” TextMode=“MultiLine”
Width=“650px” Height=“150px” onkeyup=“countNum（）；”></asp:TextBox>
（已输入<input id=“lblCount” type=“button” style=“border-style: none; background: none;” value=“0” />字）
<asp:TextBox ID=“txtText” name=“txtText” runat=“server” Columns=“80” Rows=“8” TextMode=“MultiLine”
Width=“650px” Height=“150px” onkeyup=“countNum（）；”></asp:TextBox>
（已输入<input id=“lblCount” type=“button” style=“border-style: none; background: none;” value=“0” />字）