var layers = [
    new ol.layer.Tile({
      source: new ol.source.OSM()
    }),
    new ol.layer.Image({
     extent: [8244154.7535121385,3665112.8581176517,8307313.820683872,3727346.668855488],
      source: new ol.source.ImageWMS({
        url: 'http://localhost:8080/geoserver/wms',
        params: {'LAYERS': 'airport'},
        ratio: 1,
        serverType: 'geoserver'

      })
    }),

})
    }),



  ];
  var lahore = ol.proj.transform([74.3572, 31.5546], 'EPSG:4326', 'EPSG:3857');
  //alert(olCoordinates);
  var map = new ol.Map({
    layers: layers,
    target: 'map',

    view: new ol.View({
      center:lahore ,
      zoom: 12
    })
  });

</script>