Node.js——流的下载

var request = require(‘request‘);var fs = require(‘fs‘);function downloadFile(uri, filename, callback){ ???var stream = fs.createWriteStream(filename); ???request(uri).pipe(stream).on(‘close‘, callback); }if (!fs.existsSync(‘mp4‘)) { ???fs.mkdirSync(‘mp4‘);}console.log(‘Start download...‘);for (let i = 1; i <= 22; i++) { ???const filename = ‘mp4/NodeJS-lesson-‘ + i + ‘.mp4‘; ???downloadFile(‘https://cdn.nodelover.me/video_bucket/nodejs/‘ + i + ‘.mp4‘, filename, function() { ???????console.log(‘Success: ‘ + filename + ‘ 下载完成！‘); ???});}