我建议使用request模块。下载文件与以下代码一样简单：
var fs = require('fs'), request = require('request');var download = function(uri, filename, callback){ request.head(uri, function(err, res, body){ console.log('content-type:', res.headers['content-type']); console.log('content-length:', res.headers['content-length']); request(uri).pipe(fs.createWriteStream(filename)).on('close', callback); });};download('https://www.google.com/images/srpr/logo3w.png', 'google.png', function(){ console.log('done');});
