Question

我目前正在使用MEAN堆栈创建一个简单的应用程序，但我无法正确使用我的路由。 localhost：3000将我带到404页面。另外当我去localhost：3000时，根路径应该是localhost：3000 /＃/ home，它应该显示帖子。我认为这是我的路线的问题，因为帖子出现了，如果我去localhost：3000 /帖子它列出了JSON格式的帖子。我希望根索引显示帖子但不是JSON格式。

这是在页面上打印出来的错误。

 at /Users/ipbyrne/flapper-news-1stattempt/app.js:36:13
at Layer.handle [as handle_request] (/Users/ipbyrne/flapper-news-
1stattempt/node_modules/express/lib/router/layer.js:95:5)
    at trim_prefix (/Users/ipbyrne/flapper-news-1stattempt/node_modules/express/lib/router/index.js:312:13)
    at /Users/ipbyrne/flapper-news-1stattempt/node_modules/express/lib/router/index.js:280:7
    at Function.process_params (/Users/ipbyrne/flapper-news-1stattempt/node_modules/express/lib/router/index.js:330:12)
    at next (/Users/ipbyrne/flapper-news-1stattempt/node_modules/express/lib/router/index.js:271:10)
    at /Users/ipbyrne/flapper-news-1stattempt/node_modules/express/lib/router/index.js:618:15
    at next (/Users/ipbyrne/flapper-news-1stattempt/node_modules/express/lib/router/index.js:256:14)
    at Function.handle (/Users/ipbyrne/flapper-news-1stattempt/node_modules/express/lib/router/index.js:176:3)
    at router (/Users/ipbyrne/flapper-news-1stattempt/node_modules/express/lib/router/index.js:46:12)
    at Layer.handle [as handle_request] (/Users/ipbyrne/flapper-news-1stattempt/node_modules/express/lib/router/layer.js:95:5)
    at trim_prefix (/Users/ipbyrne/flapper-news-1stattempt/node_modules/express/lib/router/index.js:312:13)
    at /Users/ipbyrne/flapper-news-1stattempt/node_modules/express/lib/router/index.js:280:7
    at Function.process_params (/Users/ipbyrne/flapper-news-1stattempt/node_modules/express/lib/router/index.js:330:12)
    at next (/Users/ipbyrne/flapper-news-1stattempt/node_modules/express/lib/router/index.js:271:10)
    at SendStream.error (/Users/ipbyrne/flapper-news-1stattempt/node_modules/express/node_modules/serve-static/index.js:120:7)

这是我的app.js文件

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 mongoose = require('mongoose');
require('./models/Posts');
require('./models/Comments');

mongoose.connect('mongodb://localhost/news');

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(path.join(__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: {}
  });
});


module.exports = app;

这是我的路线档案

var express = require('express');
var router = express.Router();
var mongoose = require('mongoose');
var Post = mongoose.model('Post');
var Comment = mongoose.model('Comment');

router.get('/posts', function(req, res, next) {
  Post.find(function(err, posts){
    if(err){ return next(err); }

    res.json(posts);
  });
});

router.post('/posts', function(req, res, next) {
  var post = new Post(req.body);

  post.save(function(err, post){
    if(err){ return next(err); }

    res.json(post);
  });
});

router.param('post', function(req, res, next, id) {
  var query = Post.findById(id);

  query.exec(function (err, post) {
    if(err){return next(err);}
    if(!post){return next(new Error('can\'t find post')); }

    req.post = post;
    return next();
  });
});
router.param('comment', function(req, res, next, id) {
  var query = Comment.findById(id);

  query.exec(function (err, comment) {
    if(err){return next(err);}
    if(!comment){return next(new Error('can\'t find comment')); }

    req.comment = comment;
    return next();
  });
});

router.get('/posts/:post', function(req, res, next) {
  req.post.populate('comments', function(err, post) {
    if(err) {return next(err);}

    res.json(req.post);
  });
});

router.put('/posts/:post/upvote', function(req, res, next) {
  req.post.upvote(function(err, post) {
    if(err) {return next(err) }

    res.json(post);
  });
});

router.put('/posts/:post/comments/:comment/upvote', function(req, 

res, next) {

  req.comment.upvote(function(err, comment) {
    if(err) {return next(err) }

    res.json(comment);
  });
});

router.post('/posts/:post/comments', function(req, res, next) {
  var comment = new Comment(req.body);
  comment.post = req.post;

  comment.save(function(err, comment) {
    if(err){return next(err); }

    req.post.comments.push(comment);
    req.post.save(function(err, post) {
      if(err){return next(err);}

      res.json(comment);
    });
  });
});
module.exports = router;

如何解决此问题的任何意见将不胜感激。如果您还需要其他任何文件可以帮助解决问题，请告诉我。

提前致谢。

Answer 1

您收到404错误，因为Express无法在“路线”子应用中找到该路线。尝试将以下内容添加到./routes/index：

pg_dump -U postgres mydb > "C:\Users\MyName\Desktop\backup"

如果您希望收到html页面，请将其放入app.js：

router.get('/', function(req, res, next) {
    res.json({route: 'this is the home page'});
});

MEAN Stack App：无法正确使用我的路线

1 个答案: