The browser just navigated to a new page.
浏览器导航到一个新页面。
This is necessary because the user may have added items to the Cart and then refreshed the page or navigated away and then back again.
这是必需的，因为用户可能已经向Cart中添加了商品，然后刷新了页面或者导航到其他地方之后又返回来。
When an item is selected, the named page is navigated to.
当选择一个项时，将导航到具有该名称的页面。
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