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。
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.
清单4是处理Ajax请求、更新购物车的简单servlet的一部分。
Listing 4 is part of a simple servlet that handles Ajax requests to update the shopping cart.
名为addtocart的onclick处理函数负责通过Ajax调用来更新购物车的状态(请参阅清单1)。
The onclick handler function named addToCart is responsible for updating the state of the cart through an Ajax call (see Listing 1).
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