使用OpenLayers放大单个点簇

var vectorLayer = new ol.layer.Vector({
  source: new ol.source.Vector({
    features: [/* 点数据 */]
  })
});

var clusterSource = new ol.source.Cluster({
  distance: 20, // 聚合距离
  source: vectorLayer.getSource()
});

var styleCache = {};
var clusterStyle = function(feature) {
  var size = feature.get('features').length;
  var style = styleCache[size];
  if (!style) {
    style = new ol.style.Style({
      image: new ol.style.Circle({
        radius: 10,
        stroke: new ol.style.Stroke({
          color: '#fff'
        }),
        fill: new ol.style.Fill({
          color: '#3399CC'
        })
      }),
      text: new ol.style.Text({
        text: size.toString(),
        fill: new ol.style.Fill({
          color: '#fff'
        })
      })
    });
    styleCache[size] = style;
  }
  return style;
};

var clusterLayer = new ol.layer.Vector({
  source: clusterSource,
  style: clusterStyle
});

var map = new ol.Map({
  target: 'map',
  layers: [clusterLayer],
  view: new ol.View({
    center: [0, 0],
    zoom: 2
  })
});