nodejs相关

let stream = request(url).pipe(fs.createWriteStream(filename));
//如果url中包含中文字符，则可能会下载出错，需要使用encodeURI(url)处理，即
//let stream = request(encodeURI(url)).pipe(fs.createWriteStream(filename));

//监听结束事件，所有的stream都是EventEmitter的实例
stream.on('finish', () => {
  console.log('finish download');
});
stream.on('error', (err) => {
  console.log(err);
});