25个关键字 程序声明:import, package 程序实体声明和定义:chan, const, func, interface, map, struct, type, var 程序流程控制:go, select, break, case, continue, default, defer, else, fallthrough, for, goto, if, range, return 类型 18个基本类型:bool, string, rune, byte, int, uint, int8,