百度点聚合用来解决加载大量点要素到地图上产生覆盖现象的问题，并提高性能。
http://api.map.baidu.com/library/MarkerClusterer/1.2/docs/symbols/BMapLib.MarkerClusterer.html
最基本的实现（在此两个按钮的功能没有实现）：
<!DOCTYPE html>
<html>
<head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><meta name="viewport" content="initial-scale=1.0, user-scalable=no" /><style type="text/css">body, html {width: 100%;height: 100%;margin:0;font-family:"微软雅黑";}#allmap{width:100%;height:80%;}#r-result{width:100%;}</style><script type="text/javascript" src="http://api.map.baidu.com/api?v=2.0&ak=您的密钥"></script><script type="text/javascript" src="http://api.map.baidu.com/library/TextIconOverlay/1.2/src/TextIconOverlay_min.js"></script><script type="text/javascript" src="http://api.map.baidu.com/library/MarkerClusterer/1.2/src/MarkerClusterer_min.js"></script><title>点聚合</title>
</head>
<body><div id="allmap"></div><div id="r-result"><input type="button" οnclick="add_overlay();" value="添加点聚合" /><input type="button" οnclick="remove_overlay();" value="重新生成点聚合" /></div>
</body>
</html>
<script type="text/javascript">// 百度地图API功能var map = new BMap.Map("allmap");map.centerAndZoom(new BMap.Point(116.404, 39.915), 4);map.enableScrollWheelZoom();var MAX = 10;var markers = [];var markerClusterer = null;for (var i = 0; i < MAX; i++) {var pt = new BMap.Point(Math.random()*40+85, Math.random()*30+21);var marker = new BMap.Marker(pt);map.addOverlay(marker);markers.push(marker);}//最简单的用法，生成一个marker数组，然后调用markerClusterer类即可。markerClusterer = new BMapLib.MarkerClusterer(map, {markers:markers});
</script>
实现两个按钮的功能，用于添加点聚合，和删除点聚合并重新加载新的点
<!DOCTYPE html>
<html>
<head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><meta name="viewport" content="initial-scale=1.0, user-scalable=no" /><style type="text/css">body, html {width: 100%;height: 100%;margin:0;font-family:"微软雅黑";}#allmap{width:100%;height:80%;}#r-result{width:100%;}</style><script type="text/javascript" src="http://api.map.baidu.com/api?v=2.0&ak=您的密钥"></script><script type="text/javascript" src="http://api.map.baidu.com/library/TextIconOverlay/1.2/src/TextIconOverlay_min.js"></script><script type="text/javascript" src="http://api.map.baidu.com/library/MarkerClusterer/1.2/src/MarkerClusterer_min.js"></script><title>点聚合</title>
</head>
<body><div id="allmap"></div><div id="r-result"><input type="button" οnclick="add_overlay();" value="添加点聚合" /><input type="button" οnclick="remove_overlay();" value="重新生成点聚合" /></div>
</body>
</html>
<script type="text/javascript">// 百度地图API功能var map = new BMap.Map("allmap");map.centerAndZoom(new BMap.Point(116.404, 39.915), 4);map.enableScrollWheelZoom();var MAX = 10;var markers = [];var markerClusterer = null;for (var i = 0; i < MAX; i++) {var pt = new BMap.Point(Math.random()*40+85, Math.random()*30+21);var marker = new BMap.Marker(pt);map.addOverlay(marker);markers.push(marker);}function add_overlay(){//最简单的用法，生成一个marker数组，然后调用markerClusterer类即可。markerClusterer = new BMapLib.MarkerClusterer(map, {markers:markers});}function remove_overlay(){for(var i=0; i<4; i++){map.removeOverlay(markers[i]);}var markers1 = markers.slice(4,markers.length);markerClusterer.clearMarkers(); //此步骤需要markerClusterer = new BMapLib.MarkerClusterer(map, {markers:markers1});}
</script>
