https://golang.org/doc/https://golang.org/doc/go1.6https://golang.org/doc/go1.5https://golang.org/doc/go1.4https://golang.org/doc/go1.3https://golang.org/doc/go1.2https://golang.org/doc/go1.1
golang各版本的变化
原文：http://www.cnblogs.com/findumars/p/5208378.html
