node下载文件资源

http&https.js

var fs = require('fs')
var http = require('http');
var https = require('https');

/**
 * @param {String} url 下载链接
 * @param {String} localFile 本地保存路径
 * @param {function} callback
 */

function getfile(url, localFile, callback) {
  var httpClient = url.slice(0, 5) === 'https' ? https : http;
  var stream = fs.createWriteStream(localFile);
  stream.on('finish', function () {
    callback(localFile);
  });
  httpClient.get(url, function (image) {
    image.pipe(stream);
  });
}
getfile('https://www.baidu.com/img/bd_logo1.png', './img/baidu.png', function () {
  console.log('下载完成，执行其他操作')
})

superagent-pipe.js

var superagent = require('superagent');
var fs = require('fs')

// 通过superagent 下载文件

/**
 * @param {String} url 下载链接
 * @param {String} localFile 本地保存路径
 * @param {function} callback
 */

function getfile(url, localFile, callback) {
  var stream = fs.createWriteStream(localFile)
  var image = superagent.get(url)
  image.pipe(stream)
  image.on('end', function () {
    callback(localFile)
  })
}
getfile('https://www.baidu.com/img/bd_logo1.png', './img/baidu.png', function (localFile) {
  console.log('下载完成，执行其他操作')
})