how to Zoom to max extent in openlayers3?

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How to zoom to max extent on click of button in openlayers-3?

I tried with

function zoomtoextent(){//map.zoomToMaxExtent(); if(globalbBox==null) { var bBox = new OpenLayers.Bounds( 68.14806781208101, 20.118149140613397, 74.47891169978561, 24.722655175866358 ); map.zoomToExtent(bBox); map.zoomTo("7"); globalbBox = bBox; }else { map.zoomToExtent(globalbBox); }}This was working fine with openlayers-2 but with openlayers-3 it is not working.



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