Question

当我尝试开始关注脚本时：

var http = require("http");

http.createServer(function(request, response) {
  response.writeHead(200, {"Content-Type": "text/plain"});
  response.write("Hello World");
  response.end();
}).listen(8000);

var ip = req.headers['x-forwarded-for'] || req.connection.remoteAddress;

console.log(ip)

我得到以下错误：

node.js:201
        throw e; // process.nextTick error, or 'error' event on first tick
              ^
ReferenceError: req is not defined
    at Object.<anonymous> (/home/ubuntu/IPDeliverer/server.js:9:10)
    at Module._compile (module.js:441:26)
    at Object..js (module.js:459:10)
    at Module.load (module.js:348:32)
    at Function._load (module.js:308:12)
    at Array.0 (module.js:479:10)
    at EventEmitter._tickCallback (node.js:192:41)

我的第一个猜测是，缺少一些模块，所以我安装了以下模块：

npm install req

然后我包含以下行

var req = require("./node_modules/req/node_modules/request");

但它仍然无效。有什么建议吗？

Answer 1

您已将请求request命名为req，而不是request，并且每个回调都有自己的request，因此请在回调之外检查IP，而不是{＆1}} ＃39;理智。请在回调中使用var http = require("http"); http.createServer(function(request, response) { response.writeHead(200, {"Content-Type": "text/plain"}); response.write("Hello World"); response.end(); var ip = request.headers['x-forwarded-for'] || request.connection.remoteAddress; console.log(ip) }).listen(8000);：

{{1}}

Answer 2

那里没有定义变量req。您必须在请求处理程序中移动它。试试这个：

var http = require("http");

http.createServer(function(request, response) {
  var ip = request.headers['x-forwarded-for'] || request.connection.remoteAddress;

  console.log(ip)
  response.writeHead(200, {"Content-Type": "text/plain"});
  response.write("Hello World");
  response.end();
}).listen(8000);

节点＆＃34; req未定义＆＃34;

2 个答案: