织梦dedecms5.7整站怎么调用购物车订单数量的方法

<?php
require_once (dirname(__FILE__) . "/../include/common.inc.php");
define('_PLUS_TPL_', DEDEROOT.'/templets/plus');
require_once(DEDEINC.'/dedetemplate.class.php');
require_once DEDEINC.'/shopcar.class.php';
$cart = new MemberShops();
$car_count = 0;
if($cart->cartCount() >= 1)
{
$car_count = $cart->cartCount();
}
echo ('document.write("' . $car_count . '"); ');
exit;
?>

<script language="javascript" src="/plus/my_car_count.php"></script>