JS 循环获取Repeater 中Checkbox1被选中的值

function print()
        {
            var temp=document.getElementsByName('checkboxx');
	        
            for(var i=0;i<temp.length;i++){
                    if(temp[i].checked==true){
                    alert(temp[i].value);
                }
            }
        }


<a title="打印单据" onclick="print();" class="tools_btn"><span><b style="background: url(/images/btn/printer.png) 50% 4px no-repeat;">打印</b></span></a>
  
<asp:Repeater ID="Repeater1" runat="server">
<ItemTemplate>
 <tr >
<td>
 <input id="Checkbox1" type="checkbox" name="checkboxx" value='<%#Eval("order_id")%>'  />
</td>
</tr>
 </ItemTemplate>
</asp:Repeater>