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---------------------js代碼

   function add1(str, id) {
            var txt = parseInt(document.getElementById("Text_" + id).value);//shuliang
            var price = document.getElementById("price_" + id).value;//jige
            if (str == "+") {
                txt = txt + 1;
            }
            else if (str == "-") {
                txt = txt - 1;
            }
            var t = $("#Text_" + id); //改變一個(gè)txt的值
            t.val(txt);
            var tmoy = (parseInt(txt) * parseFloat(price)).toFixed(2);
            document.getElementById("totalMoney").innerHTML = "￥" + tmoy
            document.getElementById("totalNum").innerHTML = t.val();
            document.getElementById("total").innerHTML = t.val();
          
        }

----------------------------html代碼

         <div class="shopCart_main_con_goods_num_jian">
                                <input id="remove" onclick="add1('-','<%#Eval("Id")%>')" type="button" value="-" />
                                </div>
                       <div class="shopCart_main_con_goods_num_Bg" >
                                <input id="price_<%#Eval("Id") %>" value='<%#Eval("Price") %>' type="hidden" />
                               <input id="Text_<%#Eval("Id") %>"   onkeyup='ChangeMoney("<%#Eval("Id") %>")' onblur='fun()'
                                    type="text" style="border: 1px solid #66CCFE; width: 35px; text-align: right;"
                                    value='<%#Convert.ToInt32(Eval("Quantity")).ToString()%>' />
                                <anthem:TextBox ID="txtNum" hdNum='<%#Eval("Id") %>' AutoUpdateAfterCallBack="true"
                                    Style="display: none;" runat="server" Text='<%#Eval("Quantity") %>'></anthem:TextBox>