Question

我一直关注this tutorial关于nodejs的介绍，但我在使用response.write（）返回内容时遇到了问题。

我的server.js代码在返回＆＃34; hello world＆＃34;当我转到域：8001，但导航到域：8001 / socket.html返回一个空白屏幕。

我已经使用console.log来检查写入＆＃34; socket的代码是否在这里。＆＃34;正在执行，但我不确定为什么它没有做任何事情。

server.js：

var http = require("http");
var url = require('url');
var fs = require('fs');

var server = http.createServer(function(request, response){
    console.log('Connection');
    var path = url.parse(request.url).pathname;
            console.log(__dirname);
            console.log(path);

    switch(path){
        case '/':
            response.writeHead(200, {'Content-Type': 'text/html'});
            response.write('hello world');
            break;
        case '/socket.html':
            fs.readFile(__dirname + path, function(error, data){
                if (error){
                    response.writeHead(404);
                    response.write("opps this doesn't exist - 404");
                }
                else{
                    response.writeHead(200, {"Content-Type": "text/html"});

                    response.write("socket is here.");
                }
            });
            break;
        default:
            response.writeHead(404);
            response.write("opps this doesn't exist - 404");
            break;
    }

    response.end();
});

server.listen(8001);

var io = require('socket.io').listen(server);

socket.html :(虽然它不应该包含在其中的内容）

<html>
  <head>
    <script src="/socket.io/socket.io.js"></script>
  </head>
<body>
    <script>
      var socket = io.connect();
    </script>
    <div>This is our socket.html file</div>
 </body>
</html>

Answer 1

您在等待fs.readFile()完成之前结束了回复。试试这个：

var http = require("http");
var url = require('url');
var fs = require('fs');

var server = http.createServer(function(request, response){
    console.log('Connection');
    var path = url.parse(request.url).pathname;
            console.log(__dirname);
            console.log(path);

    switch(path){
        case '/':
            response.writeHead(200, {'Content-Type': 'text/html'});
            response.write('hello world');
            break;
        case '/socket.html':
            fs.readFile(__dirname + path, function(error, data){
                if (error){
                    response.writeHead(404);
                    response.write("opps this doesn't exist - 404");
                }
                else{
                    response.writeHead(200, {"Content-Type": "text/html"});

                    response.write("socket is here.");
                }
                response.end();
            });
            return;
        default:
            response.writeHead(404);
            response.write("opps this doesn't exist - 404");
            break;
    }

    response.end();
});

server.listen(8001);

var io = require('socket.io').listen(server);

此外，执行fs.readFile(__dirname + path, ...);可能会有危险，因为有人可能会发送/../../../../../../etc/passwd之类的请求。你应该在那里做的是使用path模块来解析/标准化__dirname + path到绝对路径，然后确保该绝对路径以公共目录的绝对路径开始。

Response.write（）没有返回值

1 个答案: