var orderList = doc.orderList;
        var orderShopList = new Array();
        orderList.forEach(function(oneOrder){
            Shop.findOne({'name': oneOrder.shopName},function(err,shop){
                orderShopList[orderShopList.length] = shop;
                console.log(orderShopList);//有数值
            })
        })
       console.log(orderShopList);//打印为null

求教这是为什么，orderList是一个对象数组，orderShopList最终不是应该有数值吗？