http://blog.csdn.net/qingyafan/article/details/44676665
2、API
http://blog.csdn.net/sf2gis2/article/details/46702735
3. ol.source 详解http://www.myexception.cn/web/1923160.html
4https://wenku.baidu.com/view/b699ff1ba45177232e60a220.html###
5.ol.control
http://blog.csdn.net/gisshixisheng/article/details/46761535
6API
http://anzhihun.coding.me/ol3-primer/ch04/04-02.html
7.http://www.myexception.cn/web/1929738.html