nodejs学得异常痛苦,在这里将学的东西做一番整理,算是自我安慰吧。根据网上todo示例,用express和mongoose重写了部分代码,主要是业务逻辑这块(CRUD),这个没什么难度。目前尚未解决的问题是:express不能使用ejs layout template,查了好久也没解决,知道的麻烦告诉我一下。
一、代码目录
二、第三方模块
1、express
(2)nodejs中文电子书
(3)如何在WebStorm中建立express工程?
安装express
npm install express
安装成功后在node_modules下会找到express目录,同时也会找到.bin目录,它里面有express命令脚本
在终端下执行
express project_name
project_name为实际的nodejs工程名/路径 比如笔者:E:/Nodejs/todo
(4)Express官方文档
2、ejs
3、mongoose
Mongoose-让NodeJS更容易操作Mongodb数据库
三、核心介绍
1、使用mongoose写的dao(CRUD)
var util = require(‘util‘); var mongoose = require(‘mongoose‘); var Schema = mongoose.Schema; var dburl = require("../config").db;//数据库地址 exports.connect = function(callback) { mongoose.connect(dburl); } exports.disconnect = function(callback) { mongoose.disconnect(callback); } exports.setup = function(callback) { callback(null); } //定义todo对象模型 var TodoScheme = new Schema({ title:String ,finished:{type:Boolean,default:false} ,post_date:{type:Date,default:Date.now} }); //访问todo对象模型 mongoose.model(‘Todo‘, TodoScheme); var Todo = mongoose.model(‘Todo‘); //exports.emptyNote = { "_id": "", author: "", note: "" }; exports.add = function(title,callback) { var newTodo = new Todo(); newTodo.title = title; newTodo.save(function(err){ if(err){ util.log("FATAL"+err); callback(err); }else{ callback(null); } }); } exports.delete = function(id, callback) { exports.findTodoById(id, function(err, doc) { if (err) callback(err); else { util.log(util.inspect(doc)); doc.remove(); callback(null); } }); } exports.editTitle = function(id, title, callback) { exports.findTodoById(id, function(err, doc) { if (err) callback(err); else { doc.post_date = new Date(); doc.title = title; doc.save(function(err) { if (err) { util.log(‘FATAL ‘+ err); callback(err); } else callback(null); }); } }); } exports.editFinished = function(id, finished, callback) { exports.findTodoById(id, function(err, doc) { if (err) callback(err); else { doc.post_date = new Date(); doc.finished = finished; doc.save(function(err) { if (err) { util.log(‘FATAL ‘+ err); callback(err); } else callback(null); }); } }); } exports.allTodos = function(callback) { Todo.find({}, callback); } exports.forAll = function(doEach, done) { Todo.find({}, function(err, docs) { if (err) { util.log(‘FATAL ‘+ err); done(err, null); } docs.forEach(function(doc) { doEach(null, doc); }); done(null); }); } var findTodoById = exports.findTodoById = function(id,callback){ Todo.findOne({_id:id},function(err,doc){ if (err) { util.log(‘FATAL ‘+ err); callback(err, null); } callback(null, doc); }); }
2、url路由控制
"use strict"; var config = require(‘../config‘); var db = require(‘../dao/todoDao‘); exports.index = function (req, res, next) { db.allTodos(function (err, todos) { if (err) { return next(err); } res.render(‘index.html‘, {todos: todos}); }); }; exports.new = function (req, res, next) { var title = req.body.title || ‘‘; title = title.trim(); if (!title) { return res.render(‘error.html‘, {message: ‘标题是必须的‘}); } db.add(title, function (err, row) { if (err) { return next(err); } res.redirect(‘/‘); }); }; exports.view = function (req, res, next) { res.redirect(‘/‘); }; exports.edit = function (req, res, next) { var id = req.params.id; db.findTodoById(id, function (err, row) { if (err) { return next(err); } if (!row) { return next(); } res.render(‘todo/edit.html‘, {todo: row}); }); }; exports.save = function (req, res, next) { var id = req.params.id; var title = req.body.title || ‘‘; title = title.trim(); if (!title) { return res.render(‘error.html‘, {message: ‘标题是必须的‘}); } db.editTitle(id,title,function (err, result) { if (err) { return next(err); } res.redirect(‘/‘); }); }; exports.delete = function (req, res, next) { var id = req.params.id; db.delete(id, function (err) { if (err) { return next(err); } res.redirect(‘/‘); }); }; exports.finish = function (req, res, next) { var finished = req.query.status === ‘yes‘ ? true : false; var id = req.params.id; db.editFinished(id,finished, function (err, result) { if (err) { return next(err); } res.redirect(‘/‘); }); };
3、使用express框架
var express = require(‘express‘) , todo = require(‘./controllers/todo‘) , http = require(‘http‘) , config = require("./config") , todoDao = require("./dao/todoDao"); var app = express(); app.engine(‘html‘, require(‘ejs‘).renderFile); app.configure(function(){ app.set(‘port‘, config.port); app.set(‘view engine‘, ‘ejs‘); app.set(‘views‘, __dirname + ‘/views‘); app.use(express.logger(‘dev‘)); app.use(express.bodyParser()); app.use(express.methodOverride()); app.use(app.router); app.use(express.static(__dirname + ‘/public‘)); }); app.configure(‘development‘, function(){ app.use(express.errorHandler()); }); //url路由 app.get(‘/‘, todo.index); app.post(‘/todo/new‘, todo.new); app.get(‘/todo/:id‘, todo.view); app.get(‘/todo/:id/edit‘, todo.edit); app.post(‘/todo/:id/edit‘, todo.save); app.get(‘/todo/:id/delete‘, todo.delete); app.get(‘/todo/:id/finish‘, todo.finish); todoDao.connect(function(error){ if (error) throw error; }); app.on(‘close‘, function(errno) { todoDao.disconnect(function(err) { }); }); http.createServer(app).listen(app.get(‘port‘), function(){ console.log("Express server listening on port " + app.get(‘port‘)); });
注意点:为了在ejs中能使用.html,以下这句是关键,app.register()不能用了
app.engine(‘html‘, require(‘ejs‘).renderFile);
困惑点:如何在express中使用ejs的layout模板,具体是怎么设置的?!知道的麻烦说一下,谢谢~~~
四、源码
程序员不是求源码,就是求无码。
时间: 2024-10-05 06:16:32