SOURCE

const map = new ol.Map({
    target: 'map',
    layers: [
        new ol.layer.Tile({
            source: new ol.source.OSM()
        }),
    ],
    view: new ol.View({
        center: ol.proj.fromLonLat([116.39123296750768, 39.907180309385694]),
        zoom: 8
    })
});

<div id="map"></div>

html,body {
    margin: 0;
    padding: 0;
    height: 100%;
}

#map {
    height: 100%;
    width: 100%;
}