说明：  将GB编码转为UTF8，类似 E5 E5 E1,方便进行网页编码转换，优点是命令行程序，方便其它程序调用，方便用批处理将大批量文件一次性转换
(The GB encoded into UTF8, similar E5 E5 E1, convenient for web transcoding, the advantage is a command line program, easy to invoke other programs, easy to use batch files to large quantities of one-time conversion)