Question

你好，我正在玩NodeJS和expressJS，实际上我在看教程，并在编辑器中编写了相同的代码，但是在视频中，他得到的结果非常完美，但是在我的机器上，当我在其中运行命令时，它不起作用浏览器http://localhost:3000/无法正常工作，谁能帮助我解决问题所在？预先谢谢你。

    var createError = require('http-errors');
var express = require('express');
var path = require('path');
var favicon = require('serve-favicon');
var cookieParser = require('cookie-parser');
var logger = require('morgan');
var expressValidator = require('express-validator');
var session = require('express-session');
var passport = require('passport');
var localStrategy = require('passport-local').Strategy;
var bodyParser = require('body-parser');
var multer = require('multer');
var flash = require('connect-flash');
var mongo = require('mongodb');
var mongoose = require('mongoose');
var db = mongoose.connection;

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


var app = express();

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

// handle file uploads
app.use(multer({dest: './uploads'}));

app.use(logger('dev'));
app.use(express.json());
app.use(express.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));

// handle express sessions
app.use(session({
  secret:'secret',
  saveUninitialized: true,
  resave:true
}));

//passport
app.use(passport.initialize());
app.use(passport.session());

//validator
app.use(expressValidator({
    errorFormatter: function(pram, msg, value){
    var namespace = pram.split('.')
, root = namespace.shift()
, formPram = root;

while(namespace.length){
formPram += '[' + namespace.shift() + ']';
}
return {
    pram: formPram,
    msg : msg,
    value : value
};
}
}));

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

app.use(flash());
app.use(function (req, res, next) {
  res.locals.messages = require('express-messages')(req, res);
  next();
});

// 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;

节点app.js在浏览器中未显示任何内容

0 个答案: