参考：
http://club.excelhome.net/thread-1288002-1-1.html
http://club.excelhome.net/thread-709306-1-1.html
http://club.excelhome.net/thread-1340105-1-1.html
http://club.excelhome.net/forum.php?mod=viewthread&tid=311972
原文：http://www.cnblogs.com/zhubinglong/p/7447528.html