Title:
The-historical-view-switching
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Description: 把用户每次操作后的地图的Extent对象存储起来，但用户要进行切换时，把对应的Extent对象恢复回去。
The stored Extent user object each time after the operation of the map, but the user to switch, the corresponding Extent object retrieval.
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The historical view switching.docx
