[OpenLayers-Users] Zoom in time?

[carls]

Now while zooming the map, it seems a request is sent to servers, and the map
will become blank and will be waiting for the image returned. Of course we
can display a loading panel to prompt user, but it will be better to zoom
current map image roughtly to expected scale to replace the blank map.
Is there such a function switcher already within OL to zoom OL map?
Thanks!

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Regards, Carl SHE
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