在node.js中，如何明确要求在特定路由上不进行身份验证？

const express = require('express');
const app = express();

// 身份验证中间件
function authenticate(req, res, next) {
  // 这里进行身份验证逻辑
  if (req.isAuthenticated()) {
    return next();
  }
  res.status(401).send('Unauthorized');
}

// 应用身份验证中间件到所有路由
app.use(authenticate);

app.get('/protected', (req, res) => {
  res.send('This is a protected route');
});

app.get('/public', (req, res) => {
  res.send('This is a public route');
});

app.listen(3000, () => {
  console.log('Server is running on port 3000');
});

const express = require('express');
const app = express();

// 身份验证中间件
function authenticate(req, res, next) {
  if (req.isAuthenticated()) {
    return next();
  }
  res.status(401).send('Unauthorized');
}

// 应用身份验证中间件到所有路由，除了'/public'
app.use((req, res, next) => {
  if (req.path === '/public') {
    return next();
  }
  authenticate(req, res, next);
});

app.get('/protected', (req, res) => {
  res.send('This is a protected route');
});

app.get('/public', (req, res) => {
  res.send('This is a public route');
});

app.listen(3000, () => {
  console.log('Server is running on port 3000');
});