路由器 express.Router
路由器 模块化管理 路由
- 基本使用：
- 路由模块
1. 引入 express
const express = require('express');
其他相关模块
const sha1 = require('sha1');
const tableModel= require('models');
const {resolve} = require(path);
2. 创建路由器对象
const router = new express.Router();
3. 写 router.post() 或者 router.get()
4. 暴露本模块的路由
module.exports = router;
- index.js 主模块使用 app.use(中间件) 使用
1. 引入路由器模块
const uiRouter = require('./routers/uiRouter');
const userRouter = require('./routers/userRouter');
2. 应用路由器
app.use(uiRouter);
app.use(userRouter);
- 源代码实例（登录/注册）
package.json
{
"name": "node_express",
"version": "1.0.0",
"main": "index.js",
"license": "MIT",
"dependencies": {
"express": "^4.16.4",
"mongoose": "^5.4.0"
}
}
templates/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>
templates/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>
templates/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 {
width: 260px;
display: flex;
justify-content: space-between;
margin: 20px 0;
font-size: 18px;
line-height: 32px;
} .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;
}
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, '../../templates/login.html'));
}); indexRouter.get('/login', (request, response)=>{
response.sendFile(resolve(__dirname, '../../templates/login.html'));
}); indexRouter.get('/register', (request, response)=>{
response.sendFile(resolve(__dirname, '../../templates/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 = '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+)*$/.test(uEmail))){
errInfo.email = '邮箱不合法';
}; const badEmail = await userInfoModel.findOne({"userEmail": uEmail});
if(badEmail){
errInfo.emailRegistered = '邮箱已被注册';
}; if(errInfo.repeatPassword || errInfo.name || errInfo.password || errInfo.email){
response.send(errInfo);
return;
}; const fond = await userInfoModel.findOne({"userName": uName});
if(fond){
response.send({"error":'用户名已被注册'});
}else{
userInfo.userPassword = sha1(userInfo.userPassword);
await userInfoModel.create(userInfo);
response.redirect('/login'); // http://localhost:3000/login
};
}); formRouter.post('/login',async (request, response)=>{
logged = false;
let uName = request.body['user_name'];
let uPwd = request.body['user_pwd'];
userInfo = {
"userName": uName,
"userPassword": uPwd
}; if(!(/^[a-zA-Z][a-zA-Z0-9_]{5,20}$/.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;
}; response.send(logged?{"success":'登录成功'}:{"error":'用户名或密码错误'});
});
}).catch(err=>console.log(err)); module.exports = formRouter;
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);
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'); /*********************** 中间件 **********************/
// 暴露路由 login.html register.html
app.use(express.static('templates')); // 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!'));