使用MarkerClustererPlus库自定义聚类图标或在聚类簇中使用MarkerWithLabel来调整默认图标的外观和位置。

使用自定义聚类图标示例：

var options = {
    imagePath: 'https://developers.google.com/maps/documentation/javascript/examples/markerclusterer/m'
};
var markerCluster = new MarkerClusterer(map, markers, options);

使用MarkerWithLabel在聚类簇中自定义图标示例：

var options = { gridSize: 60, maxZoom: 18, imagePath: 'https://developers.google.com/maps/documentation/javascript/examples/markerclusterer/m' };
var markerCluster = new MarkerClusterer(map, markers, options);

google.maps.event.addListener(markerCluster, 'clusterclick', function(cluster) {
    // Create the text to display as the label's content
    var labelContent = "I am a cluster containing " + cluster.getSize() + " markers.";

    // Set up marker to hold label
    var marker = new MarkerWithLabel({
        position: cluster.getCenter(),
        map: map,
        labelContent: labelContent,
        labelAnchor: new google.maps.Point(22, 0),
        labelClass: "labels",
        icon: "https://developers.google.com/maps/documentation/javascript/examples/markerclusterer/m3.png"
    });
});