如何從節點JS中的回調函數中獲取數據？

Question

我在從http.request獲取節點js的數據時遇到問題我在控制檯中獲取數據，但是當我嘗試從函數中獲取它時，它並沒有進入變量，這裏是代碼，當我試圖發送端口請求時轉發我在x回調函數中得到響應，但沒有找到數據，所以任何知道的人都請讓我知道。

var fs = require('fs'); 
var http = require('http'); 
var url = require('url') , 
httpProxy = require('http-proxy'); 
var express = require("express"); 


// 
// Create your proxy server 
// 
httpProxy.createServer(9000, 'localhost').listen(8000); 

// 
// Create your target server 
// 
http.createServer(function (req, res) { 

res.writeHead(200, { 'Content-Type': 'text/plain' }); 

//res.write('request successfully proxied!' + '\n' + JSON.stringify(req.headers, true,  2)); 

var queryObject = url.parse(req.url,true).query; 


res.writeHead(200); 
if(queryObject['id']!==undefined){ 
    console.log(queryObject); 
    //alert(queryObject['id']); 
if(queryObject['id'].match('100')) 
{ 
    res.write(queryObject['id']+" forwarding to another port 8000"); 

    //sending request 
    var options = { 
      host: '192.168.10.33', 
      port: 8080, 
      path: '/demo.js?id='+queryObject['id'], 
      method: 'GET', 
      headers: { 
       accept: 'text/plain' 
      } 
     }; 

     console.log("Start conecting ..."); 
     var x = http.request(options,function(res2){ 
      console.log("Connected."); 
      res2.on('data',function(data){ 
    //********* 
//Here is the problem occur this data i m cloud not able to print 
//******** 
       console.log("data-> "+data); 

      }); 
     }); 

     x.end("\n ok"); 
    //end 

    } 
    else 
    { 
    res.write("listening on current port"); 
    } 
    } 
    res.end("\n end of page ");//'\n\nFeel free to add query parameters to the end of the url'); 
//res.end(); 
    }).listen(9000); 

Answer 1

我相信響應數據分塊，所以你需要保持數據和apend加載到一個緩衝區，然後記錄它安慰，一個數據完成steraming。

例如

var http = require('http'); 

//The url we want is: 'www.random.org/integers/?num=1&min=1&max=10&col=1&base=10&format=plain&rnd=new' 
var options = { 
    host: 'www.random.org', 
    path: '/integers/?num=1&min=1&max=10&col=1&base=10&format=plain&rnd=new' 
}; 

callback = function(response) { 
    var str = ''; 

    //another chunk of data has been recieved, so append it to `str` 
    response.on('data', function (chunk) { 
    str += chunk; 
    }); 

    //the whole response has been recieved, so we just print it out here 
    response.on('end', function() { 
    console.log(str); 
    }); 
} 

http.request(options, callback).end(); 

源：http://docs.nodejitsu.com/articles/HTTP/clients/how-to-create-a-HTTP-request