http://www.oursg.com/Article/Details/422FB18373E622600694D808A74CD774

http://www.jianshu.com/p/cd295ba51831?utm_medium=hao.caibaojian.com&utm_source=hao.caibaojian.com

 

http://www.runoob.com/bootstrap/bootstrap-popover-plugin.html

 

http://www.cnblogs.com/rik28/p/6024425.html