[OpenLayers-Users] How can I donot let the map in the overview-map zoomed and moved?

[Yang Zhaohui]

 Hello dear everyone,
    I find when I zoom in,zoom out or pan the map, the map in the overview-map is also zoomed in/out or moved. In my opinion,the overview map is called overview-map, because when I zoom-in the main map in a certain zoom-level and we do not know where the positon I am in the all map, it can show us a overview. But now the overview map is zoomed and moved following the main map,how it can play the role of a oveview-map? I want to know is there a way to let the map in the overview-map do not been moved and zoomed.Could you please give me some suggestions?Thank you very much!
 
 
 
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