出于某种原因，我已将我的css文件附加到我的html文件中。然后我在节点js中使用express打开html文件。但是，当我通过节点js运行Web服务器时，css文件无法打开。我认为既然css文件包含在html中它应该运行??

HTML

Reading in Value

Enter a UDP command in hex

节点js

//Sending UDP message to TFTP server

//dgram modeule to create UDP socket

var express= require('express')

var fs= require('fs')

var util = require('util')

var dgram= require('dgram')

var client= dgram.createSocket('udp4')

var bodyParser = require('body-parser')

var app = express()

var app2= express()

// parse application/x-www-form-urlencoded

app.use(bodyParser.urlencoded({ extended: false }))

// parse application/json

app.use(bodyParser.json())

//Reading in the html gile

app.get('/', function(req, res){

var html = fs.readFileSync('index2.html');

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

res.end(html);

});

//Sends user command utp

app.post('/', function(req, res){

//Define the host and port values

var HOST= '192.168.0.172';

var PORT= 69;

//buffer with hex commands

var message = new Buffer(req.body.number, 'hex');

//Sends packets to TFTP

client.send(message, 0, message.length, PORT, HOST, function (err, bytes) {

if (err) {

throw err;

}

res.send('UDP message sent to ' + HOST +':'+ PORT);

});

});

//CREATES ANOTHER PORT

app2.get('/', function(req, res){

client.on('message', function (message) {

res.send('received a message: ' + message);

});

});

app.listen(3000, "192.168.0.136");

app2.listen(8000, "192.168.0.136");

console.log('Listening at 192.168.0.172:3000 and Recieve message will be on 192.168.0.172:8000')