update cart(更新购物车) checkout ( 结帐 ） 3、 Checkout unregistered不注册直接 结帐 （不建议用，没有用过） ..
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You could add a compact view of the cart as a sidebar next to your tabs and update it with each completed step in the process.
可以将购物车的压缩视图作为挨着选项卡的一个侧栏添加进来，并在过程中完成每个步骤后对之进行更新。
When an item drops into their cart, the number of items in the cart and the total price of all things in the cart will both automatically update.
当商品进入购物车之后，将自动更新购物车中的商品数量和总价。
The method also returns the Cart, so that the client code can update the Cart contents and receive its new state in a single operation.
方法还返回Cart，这样客户代码在一个操作中就能更新Cart的内容并接收购物车的新状态。
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