scala隐式转换

http://www.lujinhong.com/scala%E4%B8%AD%E7%9A%84%E9%9A%90%E5%BC%8F%E8%BD%AC%E6%8D%A2-%E9%9A%90%E5%BC%8F%E5%8F%82%E6%95%B0%E5%92%8C%E9%9A%90%E5%BC%8F%E7%B1%BB.html

http://www.jianshu.com/p/a344914de895