一、参考资料
http://www.cnblogs.com/skyfsm/p/7923015.html;
http://blog.csdn.net/u010183397/article/details/56497303;
http://www.xtecher.com/Xfeature/view?aid=5372;
http://www.cnblogs.com/sumuncle/tag/%E5%9B%BE%E5%83%8F%E8%AF%86%E5%88%AB/;