我使用layout.hbs创建了一个样式格式，注意到所有页面在样式上并不具有相同的一致性。我注意到我没有在app.js中声明app.engine。接下来，我实现了app.engine代码以设置在layout.hbs中实现的默认布局

app.engine('hbs', hbs ({extname: 'hbs',defaultLayout: 'layout'}));

发生了一个错误，指出无法定位layout.hbs。我再次实现了代码，因为我注意到我没有将文件夹目录定向到layout. hbs。因此我实现了代码以

app.engine('hbs', hbs ({extname: 'hbs',defaultLayout: 'layout', layoutsDir:__dirname + '/app_server/views'}));

而且错误已经消失了，默认的布局结构已经设置为layout.hbs只显示在本地服务器索引上，在所有的控制器上都不一样。我不太确定我还遗漏了什么

控制器和路由代码

var express = require('express');
var exphbs = require('express-handlebars');
var router = express.Router();
var ctrlCaribbeanIslands = require('../controllers/CaribbeanIslands')


/* GET home page. */
router.get('/', ctrlCaribbeanIslands.login);
router.get('/blog/add',ctrlCaribbeanIslands.addPost);
router.get('/chat/add',ctrlCaribbeanIslands.addChat);
router.get('/review/add',ctrlCaribbeanIslands.addReview);
router.get('/traceYourTravel', ctrlCaribbeanIslands.tracetravel);

**module.exports = router;**

//controller 
module.exports.login = function (req, res) {
  res.render('index', { title: 'login'});
};

module.exports.addPost = function(req, res){
  res.render('index', { title: 'Add Post' });
};

module.exports.addChat = function(req, res){
  res.render('index', { title: 'Add Chat' });
};

module.exports.addReview = function(req, res){
  res.render('index', { title: 'Add Review' });

};
module.exports.tracetravel = function(req, res){
  res.render('index', { title: 'Trace travel' });

};

应用程序.js

var createError = require('http-errors');
var express = require('express');
var handlebars = require('hbs');
var path = require('path');
var cookieParser = require('cookie-parser');
var logger = require('morgan');
var hbs = require ('express-handlebars');

var indexRouter = require('./app_server/routes/index');
var usersRouter = require('./app_server/routes/users');

var app = express();

app.engine('hbs', hbs ({extname: 'hbs',defaultLayout: 'layout', layoutsDir:__dirname + '/app_server/views'}));
app.set('views', path.join(__dirname, 'app_server','views'));
app.set('view engine', 'hbs');
app.use(express.static(path.join(__dirname, 'public')));

app.use(logger('dev'));
app.use(express.json());
app.use(express.urlencoded({ extended: false }));
app.use(cookieParser());

app.use('/', indexRouter);
app.use('/users', usersRouter);

// catch 404 and forward to error handler
app.use(function (req, res, next) {
  next(createError(404));
});

// error handler
app.use(function (err, req, res, next) {
  // set locals, only providing error in development
  res.locals.message = err.message;
  res.locals.error = req.app.get('env') === 'development' ? err : {};

  // render the error page
  res.status(err.status || 500);
  res.render('error');
});

module.exports = app;