nodejs 实现网络下载

Node.js可以使用内置的http/https模块实现网络下载。以下是一个简单的示例：

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

const fileUrl = 'https://example.com/file.zip';
const savePath = './file.zip';

const download = (url, savePath) => {
  const protocol = url.startsWith('https') ? https : http;
  protocol.get(url, (response) => {
    if (response.statusCode !== 200) {
      console.error(`Failed to download ${url}. Status code: ${response.statusCode}`);
      return;
    }
    const fileStream = fs.createWriteStream(savePath);
    response.pipe(fileStream);
    fileStream.on('finish', () => {
      console.log(`${url} downloaded to ${savePath}`);
    });
  });
};

download(fileUrl, savePath);

在此示例中，我们使用http/https模块中的get方法获取文件的响应，并将其管道传输到本地文件流中。当文件流完成写入时，我们将控制台输出下载成功的消息。