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OpenLayers??????

??OpenLayers????????????????????????????????????????????????????

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??????OpenLayers???????????????????????

var markVectorSource = new ol.source.Vector();var markVectorLayer = new ol.layer.Vector({ source: markVectorSource });

2. ???????

var iconFeature = new ol.Feature({    geometry: new ol.geom.Point(        ol.proj.fromLonLat(markSettings.markCoordinate)    )});

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var iconStyle = new ol.style.Style({    image: new ol.style.Icon({        anchor: markSettings.markAnchor,        src: markSettings.markImage,        img: undefined,        imgSize: undefined    })});

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3. ???????

iconFeature.setStyle(iconStyle);markVectorSource.addFeature(iconFeature);map.removeLayer(markVectorLayer);map.addLayer(markVectorLayer);

2. ???????

markVectorSource.removeFeature(iconFeature);map.removeLayer(markVectorLayer);

3. ?????????

iconFeature.setStyle(new ol.style.Style({    image: new ol.style.Icon({        anchor: markSettings.markAnchor,        src: markImage,        img: undefined,        imgSize: undefined    })}));

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4. ???????

for (var i = 0; i < len; i++) {    mark[i].createMark();}

2. ???????

for (var i = 0; i < len; i++) {    mark[i].deleteMark();}

3. ?????????

for (var i = 0; i < len; i++) {    mark[i].changeMark('123.png');}

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