Node.js_express_服务器渲染页面 ejs

时间  2019-11-08
标签 node.js node express 服务器 渲染 页面 ejs 栏目 Node.js 繁體版
原文   原文链接

服务器渲染页面 ejscss

高效的 js 模版引擎html

将数据提早渲染到页面上， 再将渲染好的页面返回响应给浏览器node

 

提升首页加载速度mongodb

SEO 提早处理，提升加载速度数据库

  • 下载 ejs 包

npm install ejsexpress

无需引用，可是要配置模板资源目录npm

// app.set('views', '模板资源目录');json

app.set('views', 'views');    // 一般文件夹 也叫 viewspromise

  • 基本使用

1. 配置模板资源目录    ( Router 没有 set 方法，因此必须在 主模块下 app.set() )浏览器

app.set('views', 'views');    // 一般文件夹 也叫 views

2. 配置要使用的模板引擎    ( Router 没有 set 方法，因此必须在 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 能够省略 });

4. views/test.ejs 

模板语法

1. <%        %>        其中能够写任意 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 通常结合使用： <% for(var i=0; i<10; i++){ %> <%= data[i].name %> <% }; %>    

    </body>
</html>

凡是通过用户输入的东西，都须要进行特殊处理。

  • 完善的登陆/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&nbsp;户&nbsp;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&nbsp;&nbsp;&nbsp;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">登陆</button>
                    </a>
                </div>
            </form>
        </div>
    </body>
</html>

public/login.html

  • <!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8"/>
        <title>用户登陆</title>
        
        <link rel="stylesheet" type="text/css" href="css/index.css"/>
    </head>
    
    <body>
        <div id="outer_box" class="login">
            <h2>用户登陆</h2>
            <form action="http://localhost:3000/login" method="post">
                <div class="clothes">
                    <label for="input_name">用&nbsp;户&nbsp;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&nbsp;&nbsp;&nbsp;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">登陆</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&nbsp;户&nbsp;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&nbsp;&nbsp;&nbsp;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">登陆</button>
                    </a>
                </div>
            </form>
        </div>
    </body>
</html>

views/login.ejs

  • <!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8"/>
        <title>用户登陆</title>
        
        <link rel="stylesheet" type="text/css" href="css/index.css"/>
    </head>
    
    <body>
        <div id="outer_box" class="login">
            <h2> 用户登陆 <div id="server_info"> <%= data.info %> </div>
            </h2>
            <form action="http://localhost:3000/login" method="post">
                <div class="clothes">
                    <label for="input_name">用&nbsp;户&nbsp;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&nbsp;&nbsp;&nbsp;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">登陆</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('数据库已链接'); }; }); });

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='登陆成功'):(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:'\n\n服务器已启动: http://localhost:3000\nHunting Happy!'));
相关文章
相关标签/搜索
每日一句
    每一个你不满意的现在，都有一个你没有努力的曾经。
本站公众号
   欢迎关注本站公众号,获取更多信息
联系我们 最近搜索 最新文章 沪ICP备13005482号-10 MyBatis教程 SQL 教程 MySQL教程 Java 教程 Thymeleaf 教程 Hibernate教程 Spring教程 Redis教程