SOURCE

var vectorLayer = new ol.layer.Vector({
    projection: 'EPSG:4326',
    source: new ol.source.Vector()
})

var map = new ol.Map({
    target: 'map',
    layers: [
        new ol.layer.Tile({
            source: new ol.source.OSM()
        }),
        vectorLayer
    ],
    view: new ol.View({
        projection: 'EPSG:4326',
        center: [116.39123296750768, 39.907180309385694],
        zoom: 14
    })
});

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

.map {
    height: 600px;
    width: 100%;
}