zlib(module)

1、对文件进行压缩和解压（创建流）

const fs = require('fs');
const zlib = require('zlib');
const path = require('path');

function gzip(_src) {//压缩
    fs.stat(_src, function (err, stats) {
        if (stats.isFile()) {
            let rs = fs.createReadStream(_src);
            _dst = path.join(__dirname, path.basename(_src) + '.gz');
            rs.pipe(zlib.createGzip()).pipe(fs.createWriteStream(_dst));
        }
    })
}

function ungzip(_src) {//解压
    fs.stat(_src, function (err, stats) {
        if (stats.isFile()) {
            let rs = fs.createReadStream(_src);
            _dst = path.join(__dirname, path.basename(_src, '.gz'));
            rs.pipe(zlib.createGunzip()).pipe(fs.createWriteStream(_dst));
         }
  })
}