利用哈夫曼编码进行对已有文件进行重新编码，大大提高减小文件大小，减少存储空间，也就是压缩。在文件使用时，再对压缩文件进行解压缩，也就是译码，复原原有文件。-Using Huffman coding re-encoding of existing files, greatly reducing the file size increase, reduce storage space, which is compressed. When used in the file, then extract