var vectorSource = new ol.source.Vector();

var polygon = new ol.geom.Polygon([[[120.97, 23.1],[115.97, 15.1],[118.97, 13.1],[120.97, 20.1]]]).transform('EPSG:4326', 'EPSG:3857');
vectorSource.addFeature(
        new ol.Feature({
            geometry: polygon,
            name : '面',
            index : '1'
 
})

);//新增面

/*

*style可以一個數組型別的ol.style.Style，如下所示

*/
var vectorLayer = new ol.layer.Vector({
    source: vectorSource,
    style: function(feature){
            return [
                new ol.style.Style({
                image: new ol.style.Icon(
                    anchorXUnits: 'fraction',
                    anchorYUnits
 
: 'pixels',
                    src: './images/4.png'
})),
                geometry: function (feature) {
                    var coordinates = feature.getGeometry().getCoordinates()[0];
                    return feature.getGeometry().getInteriorPoint();
                }
            }),
            new 
 
ol.style.Style({
                    text: new ol.style.Text({
                        text: feature.get('name'),
                        fill: new ol.style.Fill({
                            color: '#ff0000'
})
                    }),
                    fill: new ol.style.Fill({
                        color: '#ff0000'
}),
                    stroke: new ol.style.Stroke({
                        color: '#ff0000'
})
                })
            ]
        }
});

效果如下：