javascript - 我如何在请求模块中进行response.write

Question

我正在创建 HTTP 服务器，在内部我向雅虎财经网站发送请求并从中获取一些数据，我想要做的是将我从雅虎财经获得的数据打印到浏览器。问题是response.write 在请求中不起作用。这是我的代码:

    var http = require('http');
var request = require('request');
var cheerio = require('cheerio');
var util = require('util');
var host  = "127.0.0.1";
var port = 1400;

var server = http.createServer(function (req, res) {
  //writing the headers of our response
  res.writeHead(200, {'Content-Type':'text/plain'});

  // Variable Deceleration 
// TODO: move from the global scope
var ticker  = "IBM";
var yUrl    = "http://finance.yahoo.com/q/ks?s=" + ticker;
var keyStr  = new Array();

//
// The main call to fetch the data, parse it and work on it.  
//
request(yUrl, function (error, response, body) {
  if (!error && response.statusCode == 200) {
    var $ = cheerio.load(body);


    // the keys - We get them from a certain class attribute
    var span = $('.time_rtq_ticker>span');
    stockValue = $(span).text();
    res.write("trying to print something");
    console.log("Stock  - " + ticker + " --> text " + stockValue );  
      }

}); // -- end of request --



    res.write('Welcome to StockWach\n');

  //printing out back to the client the last line
    res.end('end of demo');


});

server.listen(port, host, function () {
    console.log("Listening : " + host +":" + port);
});

Answer 1

您必须结束响应(res.end();)。几乎所有浏览器都会在显示任何内容之前缓冲响应中的一些字节，因此在响应结束之前您不会看到尝试打印某些内容。

如果您使用 cURL 之类的内容，您将在响应结束之前立即看到尝试打印某些内容。