服务器渲染页面 ejs
高效的 js 模版引擎
将数据提前渲染到页面上， 再将渲染好的页面返回响应给浏览器
提高首页加载速度
SEO 提前处理，提高加载速度
- 下载 ejs 包
npm install ejs
无需引用，但是要配置模板资源目录
// app.set('views', '模板资源目录');
app.set('views', 'views'); // 通常文件夹 也叫 views
- 基本使用
1. 配置模板资源目录 ( Router 没有 set 方法，所以必须在 主模块下 app.set() )
app.set('views', 'views'); // 通常文件夹 也叫 views
2. 配置要使用的模板引擎 ( Router 没有 set 方法，所以必须在 主模块下 app.set() )
app.set('views engine', 'ejs');
3. 将 后台数据 渲染到 模板资源 上
-
app.get('/ejs', (request, response)=>{ const data = [{ "name": '孙悟空'. "age": 555 },{
"name": '白骨精',
"age": 18
}]; response.render('test.ejs', {data}); // .ejs 可以省略 });
4. views/test.ejs
模板语法
1. <% %> 其中可以写任意 js 代码
2. <%= %>
3. <%- %>
源码测试
-
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>login</title> </head> <body> <% console.log("哈哈"); %> 不会显示到页面上 <%= data[0].name %> 输出指定数据到页面上 不会解析标签，转义 HTML 相关源码后输出
安全性更高 <%- data[1].name %> 输出指定数据到页面上 解析 HTML 源码 一般结合使用： <% for(var i=0; i<10; i++){ %> <%= data[i].name %> <% }; %> </body> </html>
凡是经过用户输入的东西，都需要进行特殊处理。
- 完善的登录/注册实例
package.json
-
{ "name": "node_express", "version": "1.0.0", "main": "index.js", "license": "MIT", "dependencies": { "connect-mongo": "^2.0.3", "ejs": "^2.6.1", "express": "^4.16.4", "mongoose": "^5.4.0", "sha1": "^1.1.1" } }
public/register.html
-
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"/> <title>用户注册</title> <link rel="stylesheet" type="text/css" href="css/index.css"/> </head> <body> <div id="outer_box" class="register"> <h2>用户注册</h2> <form action="http://localhost:3000/register" method="post"> <div class="clothes"> <label for="input_name">用 户 名</label> <input id="input_name" type="text" name="user_name" placeholder="请输入用户名" /> </div> <div class="clothes"> <label for="input_pwd">密 码</label> <input id="input_pwd" type="password" name="user_pwd" placeholder="请输入密码" /> </div> <div class="clothes"> <label for="input_repeat_pwd">确认密码</label> <input id="input_repeat_pwd" type="password" name="user_repeat_pwd" placeholder="请再次输入密码" /> </div> <div class="clothes"> <label for="input_email">注册邮箱</label> <input id="input_email" type="text" name="user_email" placeholder="请输入邮箱地址" /> </div> <div class="clothes"> <button class="register btn" type="submit">注册</button> <a class="btn" href="http://localhost:3000/login"> <button type="button">登录</button> </a> </div> </form> </div> </body> </html>
public/login.html
-
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"/> <title>用户登录</title> <link rel="stylesheet" type="text/css" href="css/index.css"/> </head> <body> <div id="outer_box" class="login"> <h2>用户登录</h2> <form action="http://localhost:3000/login" method="post"> <div class="clothes"> <label for="input_name">用 户 名</label> <input id="input_name" type="text" name="user_name" placeholder="请输入用户名" /> </div> <div class="clothes"> <label for="input_pwd">密 码</label> <input id="input_pwd" type="password" name="user_pwd" placeholder="请输入密码" /> </div> <div class="clothes"> <a class="btn" href="http://localhost:3000/register"> <button type="button">注册</button> </a> <button class="login btn" type="submit">登录</button> </div> </form> </div> </body> </html>
public/css/index.css
-
body { width: 100%; height: 100%; color: #000; background: #b9c2a4; background-size: cover; /* 指定背景图片大小 */ } /*************************************************/ #outer_box { position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%); color: #1a45c3; } #outer_box.login { color: #9e098b; } #outer_box.register { color: #1a45c3; } #outer_box>h2{ padding-bottom: 40px; margin-left: -50px; } .clothes { position: relative; width: 260px; display: flex; justify-content: space-between; margin: 20px 0; font-size: 18px; line-height: 32px; } .tips { position: absolute; top: 0; right: -100%; margin-left: -50%; margin-top: 2px; width: 252px; height: 32px; text-align: center; color: #f00; } .clothes>label{ width: 80px; text-align: center; } .clothes>input{ width: 170px; height: 32px; } button { width: 100%; height: 100%; font-size: 16px; background-color: #c4ceda; cursor: pointer; } .clothes .btn{ width: 64px; height: 32px; margin: 0 20px; } .clothes button.register{ background-color: #1a45c3; color: #fff; } .clothes button.login{ background-color: #9e098b; color: #fff; } #outer_box>h2 { position: relative; } #server_info { display: block; width: 139px; height: 20px; border-radius: 10px; position: absolute; top: 0; right: 0; color: red; font-size: 14px; text-align: center; line-height: 20px; background-color: #cecece; }
views/register.ejs
-
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"/> <title>用户注册</title> <link rel="stylesheet" type="text/css" href="css/index.css"/> </head> <body> <div id="outer_box" class="register"> <h2>用户注册</h2> <form action="http://localhost:3000/register" method="post"> <div class="clothes"> <label for="input_name">用 户 名</label> <input id="input_name" type="text" name="user_name" placeholder="请输入用户名" /> <div class="tips"><%= errInfo.name %></div> </div> <div class="clothes"> <label for="input_pwd">密 码</label> <input id="input_pwd" type="password" name="user_pwd" placeholder="请输入密码" /> <div class="tips"><%= errInfo.password %></div> </div> <div class="clothes"> <label for="input_repeat_pwd">确认密码</label> <input id="input_repeat_pwd" type="password" name="user_repeat_pwd" placeholder="请再次输入密码" /> <div class="tips"><%= errInfo.repeatPassword %></div> </div> <div class="clothes"> <label for="input_email">注册邮箱</label> <input id="input_email" type="text" name="user_email" placeholder="请输入邮箱地址" /> <div class="tips"><%= errInfo.email %></div> </div> <div class="clothes"> <button class="register btn" type="submit">注册</button> <a class="btn" href="http://localhost:3000/login"> <button type="button">登录</button> </a> </div> </form> </div> </body> </html>
views/login.ejs
-
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"/> <title>用户登录</title> <link rel="stylesheet" type="text/css" href="css/index.css"/> </head> <body> <div id="outer_box" class="login"> <h2> 用户登录 <div id="server_info"> <%= data.info %> </div> </h2> <form action="http://localhost:3000/login" method="post"> <div class="clothes"> <label for="input_name">用 户 名</label> <input id="input_name" type="text" name="user_name" placeholder="请输入用户名" /> </div> <div class="clothes"> <label for="input_pwd">密 码</label> <input id="input_pwd" type="password" name="user_pwd" placeholder="请输入密码" /> </div> <div class="clothes"> <a class="btn" href="http://localhost:3000/register"> <button type="button">注册</button> </a> <button class="login btn" type="submit">登录</button> </div> </form> </div> </body> </html>
db/connectDB.js
-
const mongoose = require('mongoose'); module.exports = new Promise((resolve, reject)=>{ mongoose.connect('mongodb://localhost:27017/user_database', {useNewUrlParser:true}) mongoose.connection.once('open', err=>{ if(err){ console.log(err); reject(err); }else{ resolve('数据库已连接'); }; }); });
models/userModel.js
-
const mongoose = require('mongoose'); const Schema = mongoose.Schema; const fieldSchema = new Schema({ "userName": { "type": String, "unique": true, "required": true }, "userPassword": { "type": String, "required": true }, "userEmail": { "type": String, "unique": true, "required": true }, "createTime": { "type": Date, "default": Date.now() } }); module.exports = mongoose.model("user_info", fieldSchema);
routers/get/index_router.js
-
const express = require('express'); const {resolve} = require('path'); const indexRouter = new express.Router(); /************************ get ***********************/ indexRouter.get('/', (request, response)=>{ response.sendFile(resolve(__dirname, '../../public/login.html')); }); indexRouter.get('/login', (request, response)=>{ response.sendFile(resolve(__dirname, '../../public/login.html')); }); indexRouter.get('/register', (request, response)=>{ response.sendFile(resolve(__dirname, '../../public/register.html')); }); module.exports = indexRouter;
routers/post/form_router.js
-
const express = require('express'); const sha1 = require('sha1'); const promiseConnect = require('../../db/connectDB.js'); const userInfoModel = require('../../models/userModel.js'); const formRouter = new express.Router(); /************************ post ***********************/ let logged = false ; promiseConnect.then(async result=>{ console.log(result); formRouter.post('/register', async (request, response)=>{ const { user_name:uName, user_pwd:uPwd, user_repeat_pwd:urePwd, user_email:uEmail, } = request.body; /**** 解构赋值 ****/ userInfo = { "userName": uName, "userPassword": uPwd, "userEmail": uEmail }; let errInfo = {}; if(urePwd !== uPwd){ errInfo.repeatPassword = '密码两次输入不一致'; }; if(!(/^[a-zA-Z][a-zA-Z0-9_]{5,20}$/.test(uName))){ errInfo.name = '用户名不合法'; }; if(!(/^[a-zA-Z0-9_]{6,20}$/.test(uPwd))){ errInfo.password = '密码不合法'; }; if(!(/^w+([-+.]w+)*@w+([-.]w+)*.w+([-.]w+)*$/.test(uEmail))){ errInfo.email = '邮箱不合法'; }; const fond = await userInfoModel.findOne({"userName": uName}); if(fond){ errInfo.name = '用户名已被注册'; }; const badEmail = await userInfoModel.findOne({"userEmail": uEmail}); if(badEmail){ errInfo.email = '邮箱已被注册'; }; let data = {errInfo}; if(errInfo.repeatPassword || errInfo.name || errInfo.password || errInfo.email){ response.render('register.ejs', data); return; }else{ userInfo.userPassword = sha1(userInfo.userPassword); await userInfoModel.create(userInfo); data.info = "注册成功"; response.render('login.ejs', {data}); }; }); formRouter.post('/login',async (request, response)=>{ logged = false; let uName = request.body['user_name']; let uPwd = request.body['user_pwd']; userInfo = { "userName": uName, "userPassword": uPwd }; if(!(/^[a-zA-Z][a-zA-Z0-9_]{5,20}$/.test(uName))){ logged = false; // 用户名不存在 }else if(!(/^[a-zA-Z0-9_]{6,20}$/.test(uPwd))){ logged = false; // 密码错误 }; const findName = await userInfoModel.findOne({"userName": uName}); const findPwd = await userInfoModel.findOne({"userPassword": sha1(uPwd)}); if(findName && findPwd){ logged = true; }; let data = {}; logged?(data.info='登录成功'):(data.info='用户名或密码错误'); response.render('login.ejs', {data}); }); }).catch(err=>console.log(err)); module.exports = formRouter;
index.js
-
const express = require('express'); const app = express(); const indexRouter = require('./routers/get/index_router.js'); const formRouter = require('./routers/post/form_router.js'); app.set('views', 'views'); // 1. 配置模板路径 app.set('view engine', 'ejs'); // 2. 配置模板引擎 /*********************** 中间件 **********************/ // 暴露路由 login.html register.html app.use(express.static('public')); // 默认调用 next(); // 将 用户输入的数据 挂载到 请求体 request.body 上 app.use(express.urlencoded({extended: true})); // 默认调用 next(); app.use(indexRouter); app.use(formRouter); /**************** 端口号 3000, 启动服务器 ***************/ app.listen(3000, err=>console.log(err?err:' 服务器已启动: http://localhost:3000 Hunting Happy!'));