node.js在windows下的学习笔记(7)---express的app.js的详细配置说明

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();

// 设置views路径和模板
//__dirname是node.js里面的全局变量，即取得执行的js所在的路径，另外__dirname是目前执行的js文件名。所以，app.set(‘views’, __dirname + ‘/views’);是设置views的文件//夹。
app.set('views', path.join(__dirname, 'views'));
//设置express.js所使用的render engine。除了Jade之外，express.js还支持EJS(embedded javascript)、Haml、CoffeScript和jQuery template等js模板。
app.set('view engine', 'jade');

// uncomment after placing your favicon in /public
//app.use(favicon(__dirname + '/public/favicon.ico'));
//app.use配置

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;