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。
When a page is navigated away from (either back or forward), an entry for the page is added to navigation history.
这是默认行为，因为初始记录在自定义状态中的状态在添加到导航历史记录中后可能会改变。
This is the default behavior because the state that is initially recorded in custom state may change after it was added to navigation history.
浏览图可以保持它所显示视图的历史记录，因此您可以从任何一个视图向前或者向后导航。
Browse diagrams keep a history of the views it displays so that you can navigate forward and backward from each view.
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