Question

我一直在编写我的第一个node.js / express测试网络应用程序，并在开发过程中面临路由问题（我想是这样，但我不确定）。以下是有关我的问题的一些调试信息。我正在使用Express 4并试图像这样连接路由器：

 var router = express.Router();
 ...
 app.use(router);

错误日志：

TypeError: undefined is not a function
    at /Users/user1/Documents/work/habitsapp-node-app/app.js:77:11
    at Layer.handle_error (/Users/user1/Documents/work/habitsapp-node-app/node_modules/express/lib/router/layer.js:71:5)
    at trim_prefix (/Users/user1/Documents/work/habitsapp-node-app/node_modules/express/lib/router/index.js:310:13)
    at /Users/user1/Documents/work/habitsapp-node-app/node_modules/express/lib/router/index.js:280:7
    at Function.process_params (/Users/user1/Documents/work/habitsapp-node-app/node_modules/express/lib/router/index.js:330:12)
    at next (/Users/user1/Documents/work/habitsapp-node-app/node_modules/express/lib/router/index.js:271:10)
    at next (/Users/user1/Documents/work/habitsapp-node-app/node_modules/express/lib/router/route.js:121:14)
    at Layer.handle [as handle_request] (/Users/user1/Documents/work/habitsapp-node-app/node_modules/express/lib/router/layer.js:97:5)
    at next (/Users/user1/Documents/work/habitsapp-node-app/node_modules/express/lib/router/route.js:131:13)
    at Route.dispatch (/Users/user1/Documents/work/habitsapp-node-app/node_modules/express/lib/router/route.js:112:3)
    at Layer.handle [as handle_request] (/Users/user1/Documents/work/habitsapp-node-app/node_modules/express/lib/router/layer.js:95:5)
    at /Users/user1/Documents/work/habitsapp-node-app/node_modules/express/lib/router/index.js:277:22
    at Function.process_params (/Users/user1/Documents/work/habitsapp-node-app/node_modules/express/lib/router/index.js:330:12)
    at next (/Users/user1/Documents/work/habitsapp-node-app/node_modules/express/lib/router/index.js:271:10)
    at SendStream.error (/Users/user1/Documents/work/habitsapp-node-app/node_modules/express/node_modules/serve-static/index.js:120:7)
    at SendStream.emit (events.js:107:17)

app.js文件

var express = require('express');

var path = require('path');
var favicon = require('serve-favicon');
var errorhandler = require('errorhandler');
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 config = require('config');
var mongoose = require('lib/mongoose');
var session = require('express-session');
var log = require('lib/log')(module);
var HttpError = require('error').HttpError;
var multer = require('multer');
var router = express.Router();

var app = express();


// view engine setup
app.engine('ejs', require('ejs-locals'));
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'ejs');
app.use(logger('dev'));
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(express.static('public'));

var MongoStore = require('connect-mongo')(session);


app.use(session({
  secret: config.get('session:secret'),
  key: config.get('session:key'),
  cookie: config.get('session:cookie'),
  store: new MongoStore({mongoose_connection: mongoose.connection})

}));



app.use(require('middleware/sendHttpError'));
app.use(require('middleware/loadUser'));

app.use(router);
app.use(express.static(path.join(__dirname, 'public')));

require('routes')(app);



app.use(function(err, req, res, next) {
  if (typeof err == 'number') {
    err = new HttpError(err);
  }

  if (err instanceof HttpError) {
      res.sendHttpError(err);
  } else {
    if (app.get('env') == 'development') {
      app.errorHandler()(err, req, res, next);
    } else {
      log.error(err);
      err = new HttpError(500);
      res.sendHttpError(err);
    }
  }
});


var server = app.listen(config.get('port'), function () {
  var host = server.address().address;
  var port = server.address().port;

  log.info('HabitTracker app listening on port ' + config.get('port'));
});

loadUser.js

var User = require('models/user').User;

module.exports = function(req, res, next) {
    req.user = res.locals.user = null;

    if (!req.session.user) return next();

    User.findById(req.session.user, function(err, user) {
        if (err) return next(err);

        req.user = res.locals.user = user;
        next();
    });
};

Answer 1

这行代码应为

  if (app.get('env') == 'development') {
  app.use(errorhandler());
} else {
  log.error(err);
  err = new HttpError(500);
  res.sendHttpError(err);
}

Answer 2

我不确定你在这做什么，但app.errorHandler未定义。关注()的{{1}}会导致出现错误消息app.errorHander。

此外，您需要使用此代码TypeError: undefined is not a function errorhandler，但您将其引用为var errorhandler = require('errorhandler');。你的外壳不匹配。

这与快递路由器或ejs无关。

node.js，express4，ejs路由异常

2 个答案: