app.js

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

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

var apiRouter = require('./routes/api');

var app = express();


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

app.set('view engine', 'html');
app.use(logger('dev'));
app.use(express.json());
app.use(express.urlencoded({ extended: false }));
app.use(cookieParser());
app.use('/static', express.static(path.join(__dirname, 'public')));
app.use(favicon(path.join(__dirname, 'public/images/favicon.ico')));
app.use('/bower_components', express.static(path.join(__dirname + '/bower_components')));
app.use('/', indexRouter);
app.use('/users', usersRouter);

// 调用api
app.use('/api', apiRouter);

// 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
  console.log(err)
  res.status(err.status || 500);
  res.render('error');
});

//CROS
app.all('*', function (req, res, next) {
  res.header('Access-Control-Allow-Origin', '*')
  res.header('Access-Control-Allow-Headers', 'Content-Type,Content-Length, Authorization, Accept,X-Requested-With')
  res.header('Access-Control-Allow-Methods', 'PUT,POST,GET,DELETE,OPTIONS')
  res.header('X-Powered-By', ' 3.2.1')
  req.method == "OPTIONS" ? res.send(200) : next()
})

module.exports = app;