flax语法知识参考: http://www.ruanyifeng.com/blog/2015/07/flex-grammar.html
flex布局实战篇参考:http://www.ruanyifeng.com/blog/2015/07/flex-examples.html
flex布局入门
原文:http://www.cnblogs.com/gengxin666/p/6815464.html