// 合并购物车，并返回新的购物车
func (this *cartImpl) Combine(c cart.ICart) cart.ICart {
if c.GetAggregateRootId() != this.GetAggregateRootId() {
for _, v := range c.GetValue().Items {
if item, err := this.AddItem(v.VendorId, v.ShopId,
v.SkuId, v.Quantity, v.Checked == 1); err == nil {
if v.Checked == 1 {
item.Checked = 1
}
}
}
c.Destroy() //合并后,需销毁购物车
}
this._snapMap = nil //clean
return this
}
