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Leaflet 是一个开源地图接口的 JavaScript 库。它是由 Vladimir Agafonkin 带领一个专业贡献者团队开发，虽然代码仅有 33 KB，但它具有开发人员开发在线地图的大部分功能。对加载的图层、色彩风格有很灵活的控制，现在很多数据可视化、分析图都在上面做。
加载地图例子：
<!DOCTYPE html>
<html>
<head>
<title>Leaflet Web Map</title>
<link rel="stylesheet" href="http://cdn.leafletjs.com/leaflet-0.7.3/leaflet.css" />
<script src="http://cdn.leafletjs.com/leaflet-0.7.3/leaflet.js"></script>
<style>
* {
padding: 0;
margin: 0;
}
body,html {
height: 100%;
}
#map {
width: 100%;
height: 100%;
min-height: 100%;
}
* html #map {
height: 100%;
}
</style>
</head>
<body>
<div id="map"></div>
<script>
var map = L.map('map',{
center: [29, 119],
zoom: 4
});
L.tileLayer('http://{s}.tile.osm.org/{z}/{x}/{y}.png', {
attribution: '© <a href="http://osm.org/copyright">OpenStreetMap</a> contributors'
}).addTo(map);
//添加wms
L.tileLayer.wms("http://mesonet.agron.iastate.edu/cgi-bin/wms/nexrad/n0r.cgi", {
layers: 'nexrad-n0r-900913',
format: 'image/png',
transparent: true,
attribution: "Weather data © 2012 IEM Nexrad"
}).addTo(map);
L.tileLayer.wms("http://gisserver.tianditu.com/TDTService/region/wms", {
layers: '030100',
format: 'image/png',
transparent: true,
attribution: "Weather data © 2012 IEM Nexrad"
}).addTo(map);
</script>
</body>
</html>