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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<link rel="stylesheet" href="https://openlayers.org/en/v5.3.0/css/ol.css" />
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<script type="text/javascript" src="https://openlayers.org/en/v5.3.0/build/ol.js"></script>
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<title>Document</title>
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</head>
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<body>
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<div id="map"></div>
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<script>
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var beijing = ol.proj.fromLonLat([116.28, 39.54]);
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var map = new ol.Map({
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target: 'map',
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layers: [
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new ol.layer.Tile({
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source: new ol.source.OSM()
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})
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],
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view: new ol.View({
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center: beijing,
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zoom: 4
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})
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});
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//实例化矢量点要素，通过矢量图层添加到地图容器中
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//这样就实现了预先加载图文标注
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var iconFeature = new ol.Feature({
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geometry: new ol.geom.Point(beijing),
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name: '北京市', //名称属性
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population: 2115 //人口数（万）
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});
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//设置点要素样式
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iconFeature.setStyle(createLabelStyle(iconFeature));
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//矢量标注的数据源
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var vectorSource = new ol.source.Vector({
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features: [iconFeature]
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});
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//矢量标注图层
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var vectorLayer = new ol.layer.Vector({
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source: vectorSource,
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visible: false
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});
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map.addLayer(vectorLayer);
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//矢量标注样式设置函数，设置image为图标ol.style.Icon
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function createLabelStyle(feature){
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console.log(feature);
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return new ol.style.Style({
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text: new ol.style.Text({
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textAlign: 'center', //位置
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textBaseline: 'bottom', //基准线
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font: 'normal 12px 微软雅黑', //文字样式
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text: feature.get('name'), //文本内容
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fill: new ol.style.Fill({ //文本填充样式（即文字颜色)
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color: '#000'
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}),
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stroke: new ol.style.Stroke({
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color: '#F00',
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width: 2
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})
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})
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});
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}
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var flag=true
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var animation=setInterval(() => {
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flag=!flag
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vectorLayer.setVisible(flag)
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}, 300);
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// setTimeout(() => {
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// clearInterval(animation)
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// vectorLayer.setVisible(true)
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// }, 1500);
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</script>
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</body>
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</html>
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