使用javascript获取gridview中的textbox值

<body>
    <form id="form1" runat="server">
    <div>
    <asp:gridview ID="GVReue" runat="server" AutoGenerateColumns="False" 
            DataSourceID="SqlDataSource1">
        <Columns>
           
            <asp:TemplateField HeaderText="ProductName" >
               <ItemTemplate>
                    <asp:TextBox ID="txtQty" runat="server" ToolTip='<%# Eval("ProductName") %>' onblur="Calculation(this.value)"></asp:TextBox>
                 </ItemTemplate>
            </asp:TemplateField>
            
        </Columns>
        </asp:gridview>
    <asp:SqlDataSource ID="SqlDataSource1" runat="server" 
            ConnectionString="<%$ ConnectionStrings:testConnectionString %>" 
            SelectCommand="SELECT * FROM [Products]"></asp:SqlDataSource>
    </div>
    </form>
</body>
</html>

javascript代码

<script type="text/javascript">
        function Calculation() {
            var grid = document.getElementById("<%= GVReue.ClientID%>");
            for (var i = 0; i < grid.rows.length - 1; i++) {
                //alert(i);
                var txtAmountReceive = $("input[id*=txtQty]")
                //alert(txtAmountReceive);
                if (txtAmountReceive[i].value != '') {
                    alert(txtAmountReceive[i].value);
                }
            }
            
        }  
</script>

测试结果为