★★有关javascrip与asp.net的小问题★★
<TR><TD style="WIDTH: 67px; HEIGHT: 4px"><FONT face="宋体"><FONT face="宋体">月租费:</FONT></FONT></TD>
<TD style="WIDTH: 294px; HEIGHT: 4px"><FONT face="宋体"><FONT face="宋体"><asp:TextBox id="monFareTextBox" runat="server" Width="160px" AutoPostBack="True"></asp:TextBox>元*</FONT></FONT></TD>
<TD style="WIDTH: 62px; HEIGHT: 4px"><FONT face="宋体">优惠率:</FONT></TD>
<TD style="HEIGHT: 4px"><FONT face="宋体"><FONT face="宋体"><asp:TextBox id="favourateTextBox" runat="server" Width="100px"></asp:TextBox>%<asp:RegularExpressionValidator id="RegularExpressionValidator1" runat="server" ValidationExpression="^[0-9]+(.[0-9]{0-3})?$" ControlToValidate="favourateTextBox" ErrorMessage="优惠率格式输入有误"></asp:RegularExpressionValidator></FONT></FONT></TD></TR>
<TR>
<TD style="WIDTH: 67px; HEIGHT: 13px"><FONT face="宋体"><FONT face="宋体">租用数量:</FONT></FONT></TD>
<TD style="WIDTH: 294px; HEIGHT: 13px"><FONT face="宋体"><FONT face="宋体">
<asp:TextBox id="hireAmountTextBox" runat="server" Width="160px" AutoPostBack="True"></asp:TextBox>* </FONT></FONT></TD>
<TD style="WIDTH: 62px; HEIGHT: 13px"><FONT face="宋体">年租费:</FONT></TD>
<TD style="HEIGHT: 13px"><FONT face="宋体"><FONT face="宋体">
<asp:TextBox id="yearFareTextBox" runat="server" Width="160px" ReadOnly="True"></asp:TextBox>万元</FONT></FONT></TD>
</TR>
当我输入月租费,租用数量,优惠率,我要得出年租费:月租费*租用数量*12/10000*优惠率
但是我是用的服务器空间,要多次回返,我发现这可以在客户断直接完成,想请教各位高手,怎么用javascript完成,我是菜鸟??