text: var http = require('http');
  var options = {
      hostname: 'localhost',
      port: 8000,
      path: '/',
      method: 'POST',
      body: {
        ddd: 'kkk'
      }
  };
  
  var req = http.request(options, function (res) {
      //获取到服务器的返回数据
      res.on('data', function (chunk) {
          //这里的chunk是Buffer对象，这一点一定要注意是编码的数据
          console.log(res instanceof http.IncomingMessage); // true
          console.log(Buffer.from(chunk).toString()); // IncomingMessage=true
      })
  })
  
  req.end();
  