leaflet一个前端gis框架，比openlayer更简单
作者github：https://github.com/mourner?tab=overview&from=2009-12-01&to=2009-12-31
github：https://github.com/Leaflet/Leaflet
中文教程：http://115.28.28.161:4000/index.html
http://jsfiddle.net/FranceImage/9dggfhnc/
http://bl.ocks.org/d3noob/7688787