{if $order_list}
{$order_total.num}
{else}
0
{/if}

2、通用标签查询购物车数据（写在任意的页面上都行）

 <div id="dr_gouwuche">
                       
</div>
 
 <script type="text/javascript">
	    $.ajax({type: "GET", url: "/index.php?s=order&c=cart&m=ajax&"+Math.random(), dataType:"jsonp",
            success: function (data) {
                $("#dr_gouwuche").html(data.html);
            },error: function(HttpRequest, ajaxOptions, thrownError) {
            alert("模板不存在：order/cart_ajax.html");
            }});
	</script>