http://developer.baidu.com/map/jsdemo.htm#h0_5
http://www.oschina.net/code/snippet_84328_54360
http://lbsyun.baidu.com/jsdemo.htm#c1_3
http://developer.baidu.com/map/jsdemo.htm#h0_5
http://www.oschina.net/code/snippet_84328_54360
http://lbsyun.baidu.com/jsdemo.htm#c1_3