我需要使用路由器集成应用程序。要定义一个应用程序，我使用app.use（'/ chat'。该应用程序单独工作，但它与路由文件不起作用。

如何修复路由？

/app.js

let express = require('express'),    sqlite3 = require('sqlite3'),    app = express(),    http = require('http').Server(app),    io = require('socket.io')(http),    iconv = require('iconv-lite'),    path = require('path'),    sassMiddleware = require('node-sass-middleware'),    fs = require('fs'),    db = new sqlite3.Database('./chat/history.db');    var routes = require('./chat');    app.use('/chat', routes);http.listen(3000);

聊天/index.js

let express = require('express'),    router = express.Router(),    sqlite3 = require('sqlite3'),    app = express(),    http = require('http').Server(app),    io = require('socket.io')(http),    iconv = require('iconv-lite'),    path = require('path'),    sassMiddleware = require('node-sass-middleware'),    fs = require('fs'),    db = new sqlite3.Database('./history.db');// DBif (!fs.existsSync(__dirname + '/history.db'))    db.run("CREATE TABLE message (id INTEGER PRIMARY KEY AUTOINCREMENT,txt TEXT)");// VIEWS SETTINGSapp.set('views', __dirname + '/tpl');app.set('view engine', 'jade');app.use(sassMiddleware({    src: path.join(__dirname, '/tpl'),    dest: path.join(__dirname, '/tpl'),    debug: true,    indentedSyntax: true,    outputStyle: 'compressed',}));app.use(express.static(__dirname + '/tpl'));// ROUTERrouter.get("/", function (req, res) {    res.render('page', {"name": "Виталий"})});// DOP FUNCfunction addMesToDB(txt) {    var stmt = db.prepare("INSERT INTO message (txt) VALUES (?)");    stmt.run(txt);    stmt.finalize();}function loadLast10() {    db.each("SELECT * FROM message LIMIT 10", function(err, row) {        io.emit('new message show', row.txt);    });}function loadAll() {    db.each("SELECT * FROM message", function(err, row) {        io.emit('new message show', row.txt);    });}function getDateTime() {    var date = new Date();    var hour = date.getHours();    hour = (hour < 10 ? "0" : "") + hour;    var min  = date.getMinutes();    min = (min < 10 ? "0" : "") + min;    var sec  = date.getSeconds();    sec = (sec < 10 ? "0" : "") + sec;    var year = date.getFullYear();    var month = date.getMonth() + 1;    month = (month < 10 ? "0" : "") + month;    var day  = date.getDate();    day = (day < 10 ? "0" : "") + day;    return year + ":" + month + ":" + day + ":" + hour + ":" + min + ":" + sec;}// EMITlet name = '';io.on('connection', function(socket){    io.sockets.on('connection', function (client) {});    socket.on('login', function(msg){        if(msg == '888') name = 'Оксана';        else if(msg == '8888') name = 'Виталий';        if(msg == '888' || msg == '8888') {            addMesToDB(getDateTime() + ' <span class="name">Вошел пользователь: ' + name + '</span>');            loadLast10();        }    });    socket.on('loadAll', function(msg){        loadAll();    });    socket.on('new message send', function(msg){        io.emit('new message show', getDateTime() + ' <span class="name">' + name + ':</span> <span class="msg">' + msg + '</span>');        addMesToDB(getDateTime() + ' <span class="name">' + name + ':</span> ' + msg);    });    socket.on('disconnect', function () {        io.emit('new message show', getDateTime() + '  <span class="name">Вышел пользователь: ' + name + '</span>');        addMesToDB(getDateTime() + '  <span class="name">Вышел пользователь: ' + name + '</span>');    });});module.exports = router;

呃：

Error: No default engine was specified and no extension was provided.    at new View (C:\chat2\chat2\node_modules\express\lib\view.js:62:11)    at Function.render (C:\chat2\chat2\node_modules\express\lib\application.js:570:12)    at ServerResponse.render (C:\chat2\chat2\node_modules\express\lib\response.js:971:7)    at C:\chat2\chat2\chat\index.js:41:9    at Layer.handle [as handle_request] (C:\chat2\chat2\node_modules\express\lib\router\layer.js:95:5)    at next (C:\chat2\chat2\node_modules\express\lib\router\route.js:137:13)    at Route.dispatch (C:\chat2\chat2\node_modules\express\lib\router\route.js:112:3)    at Layer.handle [as handle_request] (C:\chat2\chat2\node_modules\express\lib\router\layer.js:95:5)    at C:\chat2\chat2\node_modules\express\lib\router\index.js:281:22    at Function.process_params (C:\chat2\chat2\node_modules\express\lib\router\index.js:335:12)

看答案

app.set('views', __dirname + '/tpl');app.engine('jade', require('jade').renderFile);app.set('view engine', 'jade');

let express = require('express'),    app = express(),    http = require('http').Server(app),    cfenv = require('cfenv'),    appEnv = cfenv.getAppEnv();;    app.set('appName', 'chat');    app.set('port', appEnv.port);    app.use('/', require("./chat/index"));    var server = app.listen(app.get('port'), function() {console.log(app.get('appName')+' is Listening on port %d', server.address().port);});

let express = require('express'),    router = express.Router(),    sqlite3 = require('sqlite3'),    app = express(),    http = require('http').Server(app),    io = require('socket.io')(http),    iconv = require('iconv-lite'),    path = require('path'),    sassMiddleware = require('node-sass-middleware'),    fs = require('fs'),    db = new sqlite3.Database('./history.db');// DBif (!fs.existsSync(__dirname + '/history.db'))    db.run("CREATE TABLE message (id INTEGER PRIMARY KEY AUTOINCREMENT,txt TEXT)");// VIEWS SETTINGSconsole.log("__dirname is: "+__dirname);app.set('views', __dirname + '/tpl');app.engine('jade', require('jade').renderFile);app.set('view engine', 'jade');app.use(sassMiddleware({    src: path.join(__dirname, '/tpl'),    dest: path.join(__dirname, '/tpl'),    debug: true,    indentedSyntax: true,    outputStyle: 'compressed',}));//app.use(express.static(__dirname + '/tpl'));// ROUTERrouter.get("/", function (req, res) {    try{        res.render('page');    } catch(err){        console.log(err)    }});// DOP FUNCfunction addMesToDB(txt) {    var stmt = db.prepare("INSERT INTO message (txt) VALUES (?)");    stmt.run(txt);    stmt.finalize();}function loadLast10() {    db.each("SELECT * FROM message LIMIT 10", function(err, row) {        io.emit('new message show', row.txt);    });}function loadAll() {    db.each("SELECT * FROM message", function(err, row) {        io.emit('new message show', row.txt);    });}function getDateTime() {    var date = new Date();    var hour = date.getHours();    hour = (hour < 10 ? "0" : "") + hour;    var min  = date.getMinutes();    min = (min < 10 ? "0" : "") + min;    var sec  = date.getSeconds();    sec = (sec < 10 ? "0" : "") + sec;    var year = date.getFullYear();    var month = date.getMonth() + 1;    month = (month < 10 ? "0" : "") + month;    var day  = date.getDate();    day = (day < 10 ? "0" : "") + day;    return year + ":" + month + ":" + day + ":" + hour + ":" + min + ":" + sec;}// EMITlet name = '';io.on('connection', function(socket){    io.sockets.on('connection', function (client) {});    socket.on('login', function(msg){        if(msg == '888') name = 'Оксана';        else if(msg == '8888') name = 'Виталий';        if(msg == '888' || msg == '8888') {            addMesToDB(getDateTime() + ' <span class="name">Вошел пользователь: ' + name + '</span>');            loadLast10();        }    });    socket.on('loadAll', function(msg){        loadAll();    });    socket.on('new message send', function(msg){        io.emit('new message show', getDateTime() + ' <span class="name">' + name + ':</span> <span class="msg">' + msg + '</span>');        addMesToDB(getDateTime() + ' <span class="name">' + name + ':</span> ' + msg);    });    socket.on('disconnect', function () {        io.emit('new message show', getDateTime() + '  <span class="name">Вышел пользователь: ' + name + '</span>');        addMesToDB(getDateTime() + '  <span class="name">Вышел пользователь: ' + name + '</span>');    });});module.exports = router;