尝试通过 Express JS 在移动设备和 Web 之间呈现不同的视图

Question

I'm trying to render different views for each type of device. If is true, mobile will be rendered, mobile.ejs file, if isn't mobile, 'pages/index.js' .

Currently, my file index.js is responsible for configuration from Express.

Express:

const express = require('express')
const path = require('path')
const req = require('request')
const bodyParser = require('body-parser')
const PORT = process.env.PORT || 5000
const browser = require('browser-detect') 
const router = express.Router()

if(browser) {
  router.get('/', req => {
    const result = browser(req.headers['user-agent']);

    resultadoMobile = (result.mobile)

      if (resultadoMobile) {
        resultPath = "pages/mobile";
        return resultPath;
      }
      else {
        resultPath = "pages/index";
        return resultPath;
      }
  })

}

express() 

  .use(express.static(path.join(__dirname, 'public')))
  .set('views', path.join(__dirname, 'views'))
  .set('view engine', 'ejs')
  .use (bodyParser.urlencoded({ extended: true }))
  .get('/', (req, res) => res.render(resultPath))
  .listen(PORT, () => console.log(`Servidor iniciado em  ${ PORT }`))

So, to summarize:

I need to use browser-detect to detect if is mobile, if is true, render 'pages /mobile.ejs' , if not 'pages/index.ejs' .

The answer from the server is:

ReferenceError: **resultPath** is not defined
    at express.use.set.set.use.get (\path\**\\index.js:33:38)
    at Layer.handle [as handle_request] (\path\**\\node_modules\express\lib\router\layer.js:95:5)
    at next (\path\**\\node_modules\express\lib\router\route.js:137:13)
    at Route.dispatch (\path\**\\node_modules\express\lib\router\route.js:112:3)
    at Layer.handle [as handle_request] (\path\**\\node_modules\express\lib\router\layer.js:95:5)
    at \path\**\\node_modules\express\lib\router\index.js:281:22
    at Function.process_params (\path\**\\node_modules\express\lib\router\index.js:335:12)
    at next (\path\**\\node_modules\express\lib\router\index.js:275:10)
    at urlencodedParser (\path\**\\node_modules\body-parser\lib\types\urlencoded.js:91:7)
    at Layer.handle [as handle_request] (\path\**\\node_modules\express\lib\router\layer.js:95:5)

Answer 1

resultPath variable doesn't exist and there may be no need for one.

It likely should be:

.get('/', (req, res) => {
  const isMobile = browser(req.headers['user-agent']).mobile;
  res.render(isMobile ? "pages/mobile" : "pages/index");
});