要实现使用Bcrypt和PassportJs进行用户注册，可以按照以下步骤进行：

1. 安装所需的依赖：

npm install bcrypt passport passport-local express-session

2. 创建一个名为app.js的主文件，并添加以下代码：

const express = require("express");
const session = require("express-session");
const passport = require("passport");
const LocalStrategy = require("passport-local").Strategy;
const bcrypt = require("bcrypt");

const app = express();
app.use(express.urlencoded({ extended: true }));
app.use(session({ secret: "secret", resave: false, saveUninitialized: false }));
app.use(passport.initialize());
app.use(passport.session());

// 模拟一个用户数据库
const users = [];

// 配置Passport本地策略
passport.use(
  new LocalStrategy((username, password, done) => {
    const user = users.find((user) => user.username === username);
    if (!user) {
      return done(null, false, { message: "Incorrect username." });
    }
    bcrypt.compare(password, user.password, (err, res) => {
      if (res) {
        return done(null, user);
      } else {
        return done(null, false, { message: "Incorrect password." });
      }
    });
  })
);

// 序列化和反序列化用户
passport.serializeUser((user, done) => {
  done(null, user.id);
});

passport.deserializeUser((id, done) => {
  const user = users.find((user) => user.id === id);
  done(null, user);
});

// 注册路由
app.get("/", (req, res) => {
  res.send("Home Page");
});

app.get("/register", (req, res) => {
  res.send(`
    
Register
    

      
      

      
      

      Register
    
  `);
});

app.post("/register", (req, res) => {
  const { username, password } = req.body;
  const hashedPassword = bcrypt.hashSync(password, 10);
  const newUser = { id: Date.now().toString(), username, password: hashedPassword };
  users.push(newUser);
  res.redirect("/login");
});

app.get("/login", (req, res) => {
  res.send(`
    
Login
    

      
      

      
      

      Login
    
  `);
});

app.post(
  "/login",
  passport.authenticate("local", {
    successRedirect: "/profile",
    failureRedirect: "/login",
  })
);

app.get("/profile", isAuthenticated, (req, res) => {
  res.send(`
Welcome, ${req.user.username}!
`);
});

app.get("/logout", (req, res) => {
  req.logout();
  res.redirect("/");
});

// 中间件函数，用于检查用户是否已经登录
function isAuthenticated(req, res, next) {
  if (req.isAuthenticated()) {
    return next();
  }
  res.redirect("/login");
}

// 启动服务器
app.listen(3000, () => {
  console.log("Server started on port 3000");
});

3. 运行应用程序：

node app.js

现在，你可以在浏览器中访问http://localhost:3000/register来注册新用户，然后使用注册的用户名和密码登录。登录后，你将被重定向到http://localhost:3000/profile，显示欢迎消息。你也可以在浏览器中访问http://localhost:3000/logout来注销用户。