Question

我创建了一个快速项目，但我使用命令npm install安装模块，但是当我运行node app.js时，我无法得到foo，有人可以帮助我吗？

错误：

Error: Failed to lookup view "error" in views directory "C:\Users\Jack\Desktop\demo\views"
   at EventEmitter.app.render (C:\Users\Jack\Desktop\demo\node_modules\express\lib\application.js:555:17)
   at ServerResponse.res.render (C:\Users\Jack\Desktop\demo\node_modules\express\lib\response.js:938:7)
   at C:\Users\Jack\Desktop\demo\app.js:55:7
   at Layer.handle_error (C:\Users\Jack\Desktop\demo\node_modules\express\lib\router\layer.js:58:5)
   at trim_prefix (C:\Users\Jack\Desktop\demo\node_modules\express\lib\router\index.js:300:13)
   at C:\Users\Jack\Desktop\demo\node_modules\express\lib\router\index.js:270:7
   at Function.proto.process_params (C:\Users\Jack\Desktop\demo\node_modules\express\lib\router\index.js:321:12)
   at IncomingMessage.next (C:\Users\Jack\Desktop\demo\node_modules\express\lib\router\index.js:261:10)
   at fn (C:\Users\Jack\Desktop\demo\node_modules\express\lib\response.js:933:25)
   at EventEmitter.app.render (C:\Users\Jack\Desktop\demo\node_modules\express\lib\application.js:557:14)

和app.js：

var express = require('express');
var path = require('path');
var favicon = require('serve-favicon');
var logger = require('morgan');
var cookieParser = require('cookie-parser');
var bodyParser = require('body-parser');

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

var app = express();

// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'ejs');

// uncomment after placing your favicon in /public
//app.use(favicon(__dirname + '/public/favicon.ico'));
app.use(logger('dev'));
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));

app.use('/', routes);
app.use('/users', users);



// catch 404 and forward to error handler
app.use(function(req, res, next) {
  var err = new Error('Not Found');
  err.status = 404;
  next(err);
});

// error handlers

// development error handler
// will print stacktrace
if (app.get('env') === 'development') {
  app.use(function(err, req, res, next) {
    res.status(err.status || 500);
    res.render('error', {
      message: err.message,
      error: err
    });
  });
}

// production error handler
// no stacktraces leaked to user
app.use(function(err, req, res, next) {
  res.status(err.status || 500);
  res.render('error', {
    message: err.message,
    error: {}
  });
});

app.get('/foo', function (req, res) {
    res.send('Hello World!');
});

module.exports = app;

var port=3000;
var host='localhost';
app.listen(port, host);

console.log('Check url --> ' + host + ':' + port);

这是问题吗？我安装了运行app.js所需的所有模块，但它不起作用，请帮助我，我该如何解决这个问题？

Answer 1

缺少错误视图，问题不明确，但是您正在运行的示例。

创建一个名为error.ejs in文件夹视图的文件。

error.ejs

<h1><%= message %></h1>
<h2><%= error.status %></h2>
<pre><%= error.stack %></pre>

但是为了让你的应用程序在完成所有工作，创建的每个文件和文件夹架构的情况下运行，你应该使用：

Answer 2

对于404 NOT FOUND：

在您的views文件夹中添加thoses files。它可以让你犯下每一个错误。

对于你的/ foo路线，我刚看到路线是404未找到的中间件！这意味着它永远不会去路线。您应该在routes/文件夹

的文件中写下所有路线

var express = require('express');
var path = require('path');
var favicon = require('serve-favicon');
var logger = require('morgan');
var cookieParser = require('cookie-parser');
var bodyParser = require('body-parser');

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

var app = express();

// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'ejs');

// uncomment after placing your favicon in /public
//app.use(favicon(__dirname + '/public/favicon.ico'));
app.use(logger('dev'));
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));

app.use('/', routes);
app.use('/users', users);

app.get('/foo', function (req, res) {
    res.send('Hello World!');
});

// catch 404 and forward to error handler
app.use(function(req, res, next) {
  var err = new Error('Not Found');
  err.status = 404;
  next(err);
});

// error handlers

// development error handler
// will print stacktrace
if (app.get('env') === 'development') {
  app.use(function(err, req, res, next) {
    res.status(err.status || 500);
    res.render('error', {
      message: err.message,
      error: err
    });
  });
}

// production error handler
// no stacktraces leaked to user
app.use(function(err, req, res, next) {
  res.status(err.status || 500);
  res.render('error', {
    message: err.message,
    error: {}
  });
});

module.exports = app;

var port=3000;
var host='localhost';
app.listen(port, host);

console.log('Check url --> ' + host + ':' + port);

无法进入Express - NodeJS

2 个答案: