如何让Table中的第一列和第二列的值相乘然后赋值给第三列

因为需求的原因所以这样做，不废话了，直接上代码，我用的GridView绑定的数据，table也一样，因为GridView通过浏览器编译后的代码就是table。下面是aspx页面的Html代码：

<asp:GridView ID="gv_new" runat="server" AutoGenerateColumns="False" CssClass="tb_data"
                        Width="100%" AllowPaging="True" PageSize="12" EmptyDataText="没有找到相关数据！" OnPageIndexChanging="gv_new_PageIndexChanging">
                        <Columns>
                            <asp:TemplateField HeaderText="发送时间" HeaderStyle-Width="15%">
                                <ItemTemplate>
                                    <div style="text-align: center;">
                                        <%#Eval("MSG_DATE","{0:yyyy-MM-dd HH:mm:dd}")%>
                                    </div>
                                </ItemTemplate>
                            </asp:TemplateField>
                            <asp:TemplateField HeaderText="发送人数" HeaderStyle-Width="80px">
                                <ItemTemplate>
                                    <div style="text-align: center;" class="fsrs_num">
                                        <%#Eval("per_num")%>
                                    </div>
                                </ItemTemplate>
                            </asp:TemplateField>
                            <asp:TemplateField HeaderText="折算短信条数" HeaderStyle-Width="10%">
                                <ItemTemplate>
                                    <div style="text-align: center;" class="zsts_num">
                                        <%#Eval("MSG_TOTAL")%>
                                    </div>
                                </ItemTemplate>
                            </asp:TemplateField>
                            <asp:TemplateField HeaderText="消费短信条数" HeaderStyle-Width="10%">
                                <ItemTemplate>
                                    <div style="text-align: center;" class="xiaofei">
                                    </div>
                                </ItemTemplate>
                            </asp:TemplateField>
                            <asp:BoundField DataField="MSG_NUM" HeaderText="剩余短信条数" HeaderStyle-Width=""></asp:BoundField>
                        </Columns>
                    </asp:GridView>

接下来就是Jquery代码了：

<script type="text/javascript">
        $(function () {
            $("#gv_new tr").each(function () {
                var fsrs = $(this).find(".fsrs_num");
                var sdts = $(this).find(".zsts_num");
                $(this).find(".xiaofei").text((parseInt(fsrs.text()) * parseInt(sdts.text())));
            });
        });
    </script>

别忘了引用Jquery库哈，我这里就没有写出来了咯。

总结下：我之前“fsrs_num“都是定义的Id，后来结果不对，在群里问了下，说用class最好，不容易出错，结果很满意，结果图如下：