Node.js利用Express實現使用者註冊登陸功能(推薦)

阿新 • • 發佈：2020-10-26

要求

瞭解Express框架
瞭解node.js常用模組：express，body-parser，mysql
瞭解express Router
瞭解HTML form表單
瞭解MySQL Server 及安裝使用
瞭解SQLyog使用

環境

OS: Win10
Node.js: v12.19.0
Express: v4.17.1
Yarn: v1.22.10
使用VScode IDE
body-parser：1.19.0
mysql: 2.18.1
MySQL Server：5.7
SQLyog:V12.9

準備

首先在Win10上安裝Mysql，一路Next就行。安裝完成使用SQLyog連線MySQL Server。連線成功需要建立資料庫和資料表

Schema：

CREATE TABLE user (
username char(20) NOT NULL,password char(20) NOT NULL,email char(30) DEFAULT NULL,address char(20) DEFAULT NULL,phonenumber char(20) DEFAULT NULL,logintime int(20) DEFAULT NULL,id int(20) NOT NULL AUTO_INCREMENT,PRIMARY KEY (id),KEY username (username)
) ENGINE=InnoDB DEFAULT CHARSET=utf8

實戰

前端

3個page,login.html,register.html.

index.html

<!DOCTYPE html>
<html lang="en">
	<head>
		<meta charset="UTF-8">
			<title>登陸註冊</title>
			<link rel="stylesheet" type="text/css" href="/stylesheets/style.css" rel="external nofollow" rel="external nofollow" rel="external nofollow" />
		</head>
		<body>
			<a href="./register.html" rel="external nofollow" >註冊</a>
			<a href="./login.html" rel="external nofollow" >登入</a>
		</body>
	</head>
</html>

<!DOCTYPE html>
<html lang="en">
	<head>
		<meta charset="UTF-8">
			<title>登陸註冊</title>
			<link rel="stylesheet" type="text/css" href="/stylesheets/style.css" rel="external nofollow" rel="external nofollow" rel="external nofollow" />
		</head>
		<body>
			<form action="/login" method="GET" >  
				<label for="">賬號:</label> 
				<input name="user" type="text" placeholder="請輸入賬號"> 
				<br> 
				<label for="">密碼:</label> 
				<input type="password" name="password" placeholder="請輸入密碼"> 
				<br>
				<input type="submit" value="登入">
			</form>
		</body>
	</head>
</html>

<!DOCTYPE html>
<html lang="en">
	<head>
		<meta charset="UTF-8">
			<title>登陸註冊</title>
			<link rel="stylesheet" type="text/css" href="/stylesheets/style.css" rel="external nofollow" rel="external nofollow" rel="external nofollow" />
		</head>
		<body>
			<form action="/register" method="POST">
				<label for="">賬號:</label> 
				<input name="user" type="text" placeholder="請輸入賬號">
				<br> 
				<label for="">密碼:</label> 
				<input name="psw" type="password" placeholder="請輸入密碼"> 
				<br> 
				<label for="">重複密碼:</label> 
				<input name="pswa" type="password" placeholder="請重複密碼"> 
				<br> 
				<input type="submit" value="註冊">
			</form>
		</body>
	</head>
</html>

後端 server.js

var express = require("express");
var bodyParser = require("body-parser");
var router = require("./routers");

var app = express();

app.use(bodyParser.urlencoded({ extended: true }));
app.use(express.static('public'));
app.use('/',router);

module.exports = app;

Router

router/index.js,呼叫封裝好的資料庫介面：queryUer,addUser

const express=require("express");
const dao = require("../dao/db");

const router=express.Router();

router.get("/login",function(req,res){
 console.dir(req.query);
 try{
  dao.queryUser({username:req.query.user},function(err,record){
   if(err){
    console.log(err);
    throw error;
   }
   console.log(record);
   if(record && record.password == req.query.password){
    res.send(`${req.query.user}:登陸成功`);
   }else{
    res.send(`${req.query.user}:登陸失敗,檢查登陸資訊是否正確`);
   }
  });
 } catch(error){
  console.log(error);
  res.send(`${req.body.user}: 登陸失敗`);
 } 
})

router.post("/register",res){
 console.dir(req.body); 
 try{
  if(req.body.psw == req.body.pswa){
   dao.addUser({username:req.body.user,password:req.body.psw});
   res.send(`${req.body.user}: 註冊成功`);
  } else {
   console.log(error);
   res.send(`${req.body.user}: 註冊失敗:,檢查登陸資訊是否正確`);
  }  
 } catch(error){
  console.log(error);
  res.send(`${req.body.user}: 註冊失敗`);
 }
 
})
module.exports = router;

資料庫介面db.js

dao/db.js

var mysqlClient= require("./mysql");

function addUser (userInfo,callabck){
 console.log("addUser:"+ userInfo);
 var sql= `insert into user(username,password) values('${userInfo.username}','${userInfo.password}')`;
 console.log("sql:"+ sql);
 mysqlClient(sql,rows){
  if(err){
   console.log("err:"+err);
   callabck(err,null);
  } else{
   console.log("addUser result:");
   console.log(rows);
   callabck(null,rows);
  }
 })
}

function queryUser (userInfo,callabck){
 console.log("queryUser:"+ userInfo);
 var sql= `select * from user where username='${userInfo.username}'`;
 console.log("sql:"+ sql);
 mysqlClient(sql,null);
  } else{   
   rows && rows.length>0 ? callabck(null,rows[0]): callabck(null,null);
  }
 })
}
exports.addUser = addUser;
exports.queryUser = queryUser;

dao/mysql.js

const mysql = require("mysql");
const pool = mysql.createPool({
 host:"localhost",user:"root",password:"*****",database:"test"
});

function query(sql,callback){
 pool.getConnection(function(err,connection){
  if(err){
   callback(err,null);
   return
  }
  connection.query(sql,function (err,rows) {   
   callback(err,rows);
   connection.release();
  });
 });
}

module.exports = query;

mysql module