node管道流，链式流

node中大文件复制，通过流的方式复制

let fs = require('fs'); let fs1 = fs.createReadStream('./data.txt'); let fs2 = fs.createWriteStream('every.txt'); fs1.on('data',(value)=>{ fs2.write(value) }); fs1.on('end',()=>{ fs2.end(); console.log("读取成功") })

node提供了管道的方式pipe

let fs = require('fs'); let fs1 = fs.createReadStream('./data.txt'); let fs2 = fs.createWriteStream('ever.txt'); fs1.pipe(fs2);

node提供了链式流，将文件内容复制给新文件并压缩

let fs = require('fs'); let zlib = require('zlib'); let fs1 = fs.createReadStream('./ever.txt'); let fs2 = fs.createWriteStream('ever.txt.zip');//写入一个压缩文件 fs1.pipe(zlib.createGzip()).pipe(fs2)