const fs = require('fs');
let str_data = '';
//創(chuàng)建讀數(shù)據(jù)的流
let readerStream = fs.createReadStream('./test.txt');
//設置流的編碼格式
readerStream.setEncoding('utf8');
//給流綁定事件
readerStream.on('data',function (chunk) {
    str_data += chunk
})
readerStream.on('end',function (){
    console.log("讀取的數(shù)據(jù)是：",str_data)
})
readerStream.on('error',function (err){
    console.log(err.stack)
})
console.log('-----End-----')
//    讀取的數(shù)據(jù)是： 離離原上草,
//    一歲一枯榮;
//    野火燒不盡,
//    春風吹又生。

const fs = require('fs');
//創(chuàng)建一個讀數(shù)據(jù)的流
let readerStream = fs.createReadStream('./test.txt')
//創(chuàng)建一個寫數(shù)據(jù)的流
let writerStream = fs.createWriteStream('./out.txt')
//創(chuàng)建管道流
readerStream.pipe(writerStream)
console.log('----End----')
//可以完成復制，將test文件中的內(nèi)容復制到out文件中

const fs = require('fs');
const zlib = require('zlib');
//創(chuàng)建一個讀數(shù)據(jù)的流
let readerStream = fs.createReadStream('./test.txt')
                     .pipe(zlib.createGzip())
                     .pipe(fs.createWriteStream('./text.zip'))
readerStream.on('error',function (err) {
    console.log(err.stack)
})
console.log('----End----')
//創(chuàng)建一個名為text.zip的壓縮包

const fs = require('fs');
const zlib = require('zlib');
fs.createReadStream('./test.zip')
  .pipe(zlib.createGunzip())
  .pipe(fs.createWriteStream('./db.txt'))
//解壓名為test.zip的壓縮包，并將其中的內(nèi)容復制到db.txt當中