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。
Each top-level page gets its own TAB, and when a TAB is selected, the named paged is navigated to.
每个顶级页面都有自己的选项卡，当选中一个选项卡时，将导航到相应的页面。
The default selection here will depend on how the you navigated to this page.
默认选项取决于您如何导航到本页。
This header also prevents reuse of the cached version of the page and triggers an HTTP GET if the page is navigated to using the Back button.
这个头也可以防止使用后退按钮时访问了缓存页面,它将触发一个HTTPGET请求.
When a page is navigated away from (either back or forward), an entry for the page is added to navigation history.
离开某页(向后或向前导航)时，将向导航历史记录中添加该页的一个条目。
If the page is not kept alive, and the page is frequently navigated to, the cost of constantly instantiating the page may have a negative impact on the user experience.
如果页不保持活动状态，并且需要频繁导航到该页，则不断实例化该页的开销可能会对用户体验产生负面影响。
For example, the current navigator might be a frame inside a page that is being navigated to inside a parent navigator.
例如，当前导航器可能是在父导航器内导航到的页面中的框架。
For example, the current navigator might be a frame inside a page that is being navigated to inside a parent navigator.
例如，当前导航器可能是在父导航器内导航到的页面中的框架。
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