最简单的地图热力图，用的是百度的api，所以取经纬度的时候最好也用百度地图。
这里已经填好百度api的key了，但还是建议大家注册使用自己的key，因为有每日额度，超过访问次数了就不可用了。
<script type="text/javascript" src="http://api.map.baidu.com/api?v=2.0&ak=VNekEeQpPj7NhVX9jxcjiC1onpZUNToQ"></script>效果展示：
下面是完整代码，注释已经标得很清楚了，直接保存为html文件用浏览器打开就可以了。
<!DOCTYPE html>
<html>
<head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><meta name ="viewport" content ="width=device-width, initial-scale=1, maximum-scale=1, minimum-scale=1, user-scalable=no"><script type="text/javascript" src="http://api.map.baidu.com/api?v=2.0&ak=VNekEeQpPj7NhVX9jxcjiC1onpZUNToQ"></script><script type="text/javascript" src="http://api.map.baidu.com/library/Heatmap/2.0/src/Heatmap_min.js"></script><title>XXXXX</title><style type="text/css">ul,li{list-style: none;margin:0;padding:0;float:left;}html{height:100%}body{height:100%;margin:0px;padding:0px;font-family:"微软雅黑";}#allmap{height:100%;width:100%;}</style>
</head>
<body><div id="allmap"></div>
</body>
</html>
<script src="http://libs.baidu.com/jquery/1.9.0/jquery.js"></script>
<script type="text/javascript">// 百度地图API功能var map = new BMap.Map("allmap");
//设置打开后的中心位置，这里设置的是北京var point = new BMap.Point(116.512885,39.847469);
//设置打开后的缩放大小，这里设置的大致为中国版图的大小map.centerAndZoom(point, 5);// 编写自定义函数,创建标注function addMarker(point){var marker = new BMap.Marker(point);map.addOverlay(marker);}
//lat是纬度，lng是经度，count是对应的数值大小
//下列的经纬度基本覆盖了中国各个省份及重要城市var res = [{"count": 61, "lat": 30.5984667364009, "lng":114.311581554732},
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{"count": 69, "lat": 29.6500402747677, "lng":91.1208239154639}];heatmapOverlay = new BMapLib.HeatmapOverlay({"radius":20});map.addOverlay(heatmapOverlay);
//调整max的值效果会不一样，但count值一定要在max值之内heatmapOverlay.setDataSet({data: res,max:100});
</script>
