OpenLayer4——点

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <link href="ol/ol.css" rel="stylesheet" type="text/css"/>
    <script type="text/javascript" src="ol/ol.js" charset="utf-8"></script>
</head>
<body>
<div id="map" style="width: 100%;height: 100%"></div>
<script>

    //创建一个图层
    var layerVector = new ol.layer.Vector({
        source: new ol.source.Vector()
    });

    //样式（相见官网API）
    var iconStyle = new ol.style.Style({
        //背景图标
        image: new ol.style.Circle({
            radius: 15,
            fill: new ol.style.Fill({
                color: 'orange'
            }),
            stroke: new ol.style.Stroke({
                color: '#0000ff',
                width: 3
            })
        }),
        //文本样式
        text: new ol.style.Text({
            text: 'this is a point',
            offsetY: '20',
            textAlign: "center",
            font: 'bold 24px serif',
            fill: new ol.style.Fill({
                color: '#000'
            }),
            stroke: new ol.style.Stroke({
                color: '#fff',
                width: 3
            })
        })
    });

    //创建点对象
    var pointFeature = new ol.Feature({
        geometry: new ol.geom.Point([12950000, 4860000])
    });
    //添加样式
    pointFeature.setStyle(iconStyle);

    //将点天添加到图层
    layerVector.getSource().addFeature(pointFeature);

    //创建地图实例
    var map = new ol.Map({
        layers: [
            new ol.layer.Tile({
                source: new ol.source.OSM(),
            })
            //使用层
            , layerVector
        ],
        target: 'map',
        view: new ol.View({
            center: [12950000, 4860000],
            zoom: 7
        })
    });
</script>
</body>
</html>