首先新建一个HTML：（引入jq）
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<meta http-equiv="X-UA-Compatible" content="ie=edge" />
<title>Document</title>
<script src="./jquery.js"></script>
<style>
* {
margin: 0;
padding: 0;
}
div:nth-child(3) {
display: none;
}
input {
display: block;
height: 40px;
200px;
margin: 20px auto;
}
button:not(#email) {
display: block;
height: 30px;
70px;
background: lightcoral;
border: none;
margin: 0 auto;
}
#email {
display: block;
height: 30px;
100px;
margin: 0 auto;
}
ul {
height: 50px;
200px;
background: lightblue;
margin: 0 auto;
list-style: none;
}
li {
height: 50px;
100px;
float: left;
text-align: center;
line-height: 50px;
}
li:hover {
background: lightgreen;
cursor: pointer;
}
</style>
</head>
<body>
<ul>
<li id="regChange">注册</li>
<li id="loginChange">登录</li>
</ul>
<div id="reg">
<input type="text" placeholder="邮箱" id="user" />
<input type="text" placeholder="密码" id="psd" />
<input type="text" placeholder="验证码" id="sendmail" />
<button id="email">发送验证码</button> <button id="btn">注册</button>
</div>
<div id="login">
<input type="text" placeholder="用户名" id="loguser" />
<input type="text" placeholder="密码" id="logpsd" />
<button id="logbtn">登录</button>
</div>
<script>
//增加监听事件
btn.addEventListener("click", clickHandler);
logbtn.addEventListener("click", clickHandler);
email.addEventListener("click", sendHandler);
regChange.addEventListener("click", changeHandler);
loginChange.addEventListener("click", changeHandler);
function clickHandler(e) {
if (this.textContent === "注册") {
//若为空时跳出
if (!user.value || !psd.value || !sendmail.value) {
alert("不能为空");
return;
}
//点击注册时将邮箱号，密码，验证码传送至后台
$.post("http://localhost:1024/main/reg", {
email: user.value,
password: psd.value,
mailnum: sendmail.value
},
function (res) {
//后台返回的对象，若hasUser为真，说明已有用户名，否则注册成功
if (res.hasUser) {
alert("注册失败");
return;
} else {
alert("注册成功~");
}
//成功后隐藏注册，显示登录
reg.style.display = "none";
login.style.display = "block";
}
);
} else if (this.textContent === "登录") {
// 同注册，不能为空
if (!loguser.value || !logpsd.value) {
alert("不能为空");
return;
}
//点击登录时将邮箱号，密码传送至后台
$.post("http://localhost:1024/main/login", {
email: loguser.value,
password: logpsd.value
},
function (res) {
//后台返回的对象，若isUser为真，说明正确，并跳转至欢迎页，否则失败
if (res.isUser) {
alert("登录成功");
location.href = "./welcome.html";
} else {
alert("用户名或密码不正确");
return;
}
}
);
}
}
function sendHandler(e) {
// 点击获取验证码后将验证码发送到后端进行比对
$.post("http://localhost:1024/main/sendmail", {
email: user.value
});
}
function changeHandler(e) {
// 点击上方的注册登录切换
if (e.target.textContent === "注册") {
reg.style.display = "block";
login.style.display = "none";
} else {
reg.style.display = "none";
login.style.display = "block";
}
}
</script>
</body>
</html>
新建set文件夹，在文件夹中新建几个js文件：
main.js(连接mongoose数据库)
const mongoose = require('mongoose');//引入mongoose
mongoose.connect('mongodb://localhost:27017/UserList', {
useNewUrlParser: true
});//连接数据库
let db = mongoose.connection;
db.on("error", function (error) {
console.log("错误：" + error);
});
db.on("open", function () {
console.log("连接成功");
});
db.on('disconnected', function () {
console.log('连接断开');
});
module.exports = mongoose;//抛出mongose对象
mod.js（实例化Schema，新建数据库）
const mongoose = require('./main');//引入main模块
const Schema = mongoose.Schema;//新建schema对象
let userSchema = new Schema({
email: {
type: String,
required: true
},
password: {
type: String,
required: true
}
});//实例化对象
let userModel = mongoose.model('allUser', userSchema);//新建数据库
module.exports = userModel;//抛出模块
send.js（邮件发送模块）
const nodemailer = require("nodemailer");
let obj = {
transporter: nodemailer.createTransport({
service: "qq", // 运营商 qq邮箱 网易//
port: 465,
secure: true,
auth: {
user: "*******@qq.com", //发送方的邮箱
pass: "********" // pop3 授权码
}
}),
send: function(mail, content,callback) {
mailOptions = {
from: '"Hello World~" <******@qq.com>',
to: mail,
subject: content,
text: content,
html: "<h1>" + content + "</h1>"
};
this.transporter.sendMail(mailOptions, (error, info) => {
if (error) {
return console.log(error);
}
console.log("Message sent: %s", info.messageId);
callback();
});
}
};
module.exports = obj;
reg.js（创建注册模块）
const express = require('express');
const router = express.Router(); //新建路由
const Model = require('./mod'); //传入数据库对象
const sendMail = require('./send'); //传入邮件发送的模块对象
var count = ""; //新建一个空字符存放验证码，可供全局调用
//用post方法传输数据
router.post('/reg', (req, res) => {
//保存前端传来的数据
var mail = req.body.email;
var psd = req.body.password;
var mailnum = req.body.mailnum;
//使用Model对象连接数据库
Model.find({// 查询邮箱
'email': mail
}).then((data) => {
//若返回的邮箱找到或验证码不对，则抛错
if (data.length >= 1 || mailnum !== count) {
res.send({
hasUser: true
});
return;
}
res.send({
hasUser: false
})
Model.insertMany({//反之将邮箱插入到数据库
'email': mail,
'password': psd
}).then((result) => {
console.log(result);
})
}).catch((err) => {
console.log(err);
});
});
//邮箱验证接口
router.post("/sendmail", (req, res) => {
count = ""; //初始化验证码容器
var mail = req.body.email; //获取前端传来的邮箱号
for (let i = 0; i < 4; i++) {
count += Math.floor(Math.random() * 10); //生成4个随机数
}
var callback = () => {
console.log("发送成功");
};
sendMail.send(mail, count, callback); //调用邮件发送模块
res.send('send');
});
module.exports = router;
login.js（登录模块）
const express = require('express');
const router = express.Router();//新建路由
const Model = require('./mod');//获取数据库对象
router.post('/login', (req, res) => {//路由地址
//保存前端传来的数据
var mail = req.body.email;
var psd = req.body.password;
Model.find({
// 查询是否有该用户，若用户邮箱和密码符合，则抛出正确，否则抛出错误对象
'email': mail,
'password': psd
}).then((data) => {
if (data.length >= 1) {
res.send({
isUser: true
});
} else {
res.send({
isUser: false
});
}
}).catch((err) => {
console.log(err);
});
});
module.exports = router;
然后在set文件夹外面新建一个服务（server.js），将所有的模块拼接：
const express = require('express');
const app = express();
const cors = require("cors"); //引入cors模块（解决跨域问题）
var bodyParser = require('body-parser');
app.use(cors());
// 下面的类似于http请求的头文件(另一篇文章有写到http请求，也是注册登录)
app.all("*", function (req, res, next) {
//设置允许跨域的域名，*代表允许任意域名跨域
res.header("Access-Control-Allow-Origin", "*");
res.header("Access-Control-Allow-Headers", "content-type"); //允许的header类型
res.header("Access-Control-Allow-Methods", "DELETE,PUT,POST,GET,OPTIONS"); //跨域允许的请求方式
next(); //是否继续向下执行
});
//解决post传输的数据格式问题
app.use(bodyParser.urlencoded({
extended: false
}))
app.use(bodyParser.json())
// 路由选择导入注册
const reg = require('../set/reg.js');
app.use('/main', reg);
// 路由选择导入登录
const login = require('../set/login.js');
app.use('/main', login);
// 开启监听
app.listen(1024, () => {
console.log('Server Start~');
});
最后运行server.js实现注册登录
注意：案例需要用到monogoDB，Jq，mongoose模块，express模块，nodemailer模块，cors模块，
body-parser模块