为什么在使用Node.js的createReadStream()函数时浏览器会一直加载

createReadStream() 功能比性能更好 readFile() ,因为 createReadStream() 读取和写入卡盘中的数据 读取文件() 读取文件() 函数可能需要更长的时间才能进一步处理数据。因此,我选择使用 createReadStream() 功能如下。

    // Create a server with fs.createReadStream(), better performance and less memory usage.
    http.createServer( function (request, response) {
      // Parse the request containing file name
      var pathname = url.parse(request.url).pathname;

      // Create a readable stream.
      var readerStream = fs.createReadStream(pathname.substr(1));

      // Set the encoding to be UTF8.
      readerStream.setEncoding('UTF8');

      // Handle stream events --> data, end and error
      readerStream.on('data', function(chunk) {
        // Page found
        // HTTP Status: 200 : OK
        // Content Type: text/plain
        response.writeHead(200, {'Content-type': 'text/html'});

        // Write the content of the file to response body.
        response.write(chunk);

        console.log('Page is being streamed...');
      });

      readerStream.on('end', function() {
        console.log('Page is streamed and emitted successfully.');
      });

      readerStream.on('error', function(err) {
        // HTTP Status: 404 : NOT FOUND
        // Content Type: text/plain
        response.writeHead(404, {'Content-type': 'text/html'});

        console.log('Page streaming error: ' + err);
      });

      console.log('Code ends!');

    }).listen(8081);

    // Console will print the message
    console.log('Server running at http://127.0.0.1:8081/');

我的 .html .txt 文件包含三行短文本。启动服务器后,我通过 http://127.0.0.1:8081/index.html . 一切正常 index.html

Node.js服务器正常吗?图标是否一直在转动,但对服务器没有任何成本?或者我错过了什么,图标不应该继续转动?