哈弗曼编码（1）文件名的输入可以从命令行给出或程序界面给出； （2）压缩和解压选择也可以从命令行给出或程序界面给出； （3）给出压缩后的指标：压缩率=压缩后的文件大小/压缩前的文件大小-Havermann code (1) the input file name can be given from the command line interface is given or procedures　(2) compression and decompression options can also be given from the command line interface is given or procedures　(3) given the compressed indicators: Compression ratio = compressed file size/compressed file size before