Express应用的结构其实就是R(路由)+M(模型)+V(视图)+C(控制器)。

今天总结之前写的cnode的登陆注册功能。

前提搭好环境, mongodb + redis。

R路由

var express = require('express');
var router = express.Router();
//引入控制器
var signController = require('../controller/sign');// 注册页面
router.get('/signup', signController.showSignUp);// 登陆页面
router.get('/signin', signController.showSignin);// 提交注册
router.post('/signup', signController.signup);// 提交登陆
router.post('/signin', signController.signin);// 登出
router.get('/signout', signController.signout);module.exports = router;复制代码

M(模型)

// user model
var mongoose = require('mongoose'),Schema = mongoose.Schema;
// 连接本地数据库
mongoose.connect('mongodb://127.0.0.1/cnode');// 创建Schema
var UserSchema = new Schema({username: String,pass: String,email: String
});// 为model添加方法// getUserBySignupInfo: 根据注册信息查询用户信息
UserSchema.statics.getUserBySignupInfo = function(username, email, callback){// 查询条件var cond = ['$or', {username: username}, {email: email}];this.find(cond, callback);
};// addUser: 添加用户
UserSchema.statics.addUser = function(user, callback){// add userthis.create(user, callback);
};// getUser: 获取用户
UserSchema.statics.getUser = function(username, pass, callback){this.findOne({username: username, pass: pass}, callback);
};// 根据Schema导出数据模型
module.exports = mongoose.model('User', UserSchema);复制代码

V(视图)

模板代码就不贴了, 主要有一点注意.前端如何判断是否登陆,进行不同模板渲染

// app.js
// 中间件: 是否用户登陆
app.use(function(req, res, next){app.locals.current_user = req.session.user;next();
});复制代码

 <% if(typeof(current_user) != 'undefined' && success){%>
<li><a href="/signout">登出</a></li>
<% } else {%>
<li><a href="/signup">注册</a></li>
<li><a href="/signin">登陆</a></li>复制代码

C(控制器)

// 控制器: 处理登陆与注册逻辑var eventproxy = require('eventproxy');
// 引入user model
var UserModel = require('../model/user');// 渲染注册页面
exports.showSignUp = function (req, res) {res.render('sign/signup');
};// 提交注册信息
exports.signup = function (req, res) {// 获取表单数据var username = req.body.loginname;var pass = req.body.pass;var re_pass = req.body.re_pass;var email = req.body.email; var ep = new eventproxy();// watch emit event ep.on('info_error', function (msg) {res.status(422);res.render('sign/signup', {error: msg});});// 校验表单数据// 空校验let userInfoArr = [username, pass, re_pass, email]for (let i = 0, len = userInfoArr.length; i < len; i++) {if (userInfoArr[i] === '') {let msgErr = userInfoArr[i]ep.emit('info_error', '表单字段内容不能为空'); // emit错误事件breakreturn;}};// 密码确认校验var passIsDiff = pass !== re_pass;if (passIsDiff) {ep.emit('info_error', '密码与确认密码不相等!'); // emit错误事件return;};// 保存到数据库// 根据注册信息去数据库进行查询验证UserModel.getUserBySignupInfo(username, email, function(err, users){if (err) {ep.emit('info_error', '获取用户信息失败!');return;};if (users.length > 0) {ep.emit('info_error', '用户名或者邮箱已存在!');return;};// 保存用户信息UserModel.addUser({ username: username, pass: pass, email: email}, function(err, result){if (result) {res.render('sign/signup', {success: '恭喜,注册成功!'});} else {ep.emit('info_error', '注册失败!');};});});};// 渲染登陆页面
exports.showSignin = function (req, res) {res.render('sign/signin');
};// 提交登陆信息
exports.signin = function (req, res) {// 获取表单数据var username = req.body.name;var pass = req.body.pass;// 空校验if (!username || !pass) {res.status(422);return res.render('sign/signin', {error: '您填写的表单信息不完整!'});};// 获取用户信息UserModel.getUser(username, pass, function(err, user){if (user) {// 登陆成功, 保存用户信息进入sessionreq.session.user = user;res.render('sign/signin', {success: '登陆成功!'});} else {res.status(422);res.render('sign/signin', {success: '用户名或者密码有误!'});};});
};// 处理登出
exports.signout = function (req, res) {// 销毁sessionreq.session.destroy();// 重定向到首页res.redirect('/');
};复制代码

原文地址: cnode系列之登陆注册功能
仓库代码:cnode