博客搬迁给你带来的不便,敬请谅解!
http://www.suanliutudousi.com/2017/10/26/typeof-%E6%A3%80%E6%B5%8B%E6%95%B0%E6%8D%AE%E7%B1%BB%E5%9E%8B%E7%9A%84%E6%97%B6%E5%80%99%E9%9C%80%E8%A6%81%E6%B3%A8%E6%84%8F%E7%9A%84%E5%B0%8F%E7%BB%86%E8%8A%82/