viewController.js

const Book = require('./../models/bookModel')
const APIFeatures = require('./../utils/apiFeatures.js')

exports.getOverview=async(req,res,next)=>{

  const features = new APIFeatures(Book.find(),req.query).filter().paginations()
  let getItAllProd = await features.getBook;
  res.render('overview',{
    data:getItAllProd,
    title:"trending books"
  })
  next()
}

exports.getOneBook =async(req,res,next)=>{
  const getThatBook = await Book.findOne({slug:req.params.id})
  res.render('onebook',{
    data:getThatBook
  })
  next()
}

exports.categories= async(req,res,next)=>{
  const getCate = await Book.find({category:req.params.category});
  res.render('overview',{
    data:getCate,
    name:req.params
  })
  next()
}

exports.paginationOfBook = async(req,res,next)=>{
  let pages = req.params.page
  pages = pages * 6 || 6;
  const limit = 6;
  let skip = pages-6;

  const getlimitedbook = await Book.find({}).limit(limit).skip(skip);
  res.render('overview',{
    data:getlimitedbook,
  })
  next()
}

viewRoutes.js

const express = require('express');
const viewController = require('./../controllers/viewController')
const router = express.Router();

router.get('/overview',viewController.getOverview)

router.get('/overview/:category',viewController.categories)
router.get('/overview/:page',viewController.paginationOfBook)
router.get('/overview/:id',viewController.getOneBook)

module.exports = router;

使用http：//localhost：3000/overview/：category，我可以获取所有书籍，而使用http：//localhost：3000/overview/：category，我可以按类别获取书籍。但是，如果我尝试加载http：//localhost：3000/overview/：page和http：//localhost：3000/overview？：id的数据，数据将无法加载。因此，下面我对路由进行了一些更改。

router.get('/overview',viewController.getOverview)
router.get('/overview/:id',viewController.getOneBook)
router.get('/overview/:category',viewController.categories)
router.get('/overview/:page',viewController.paginationOfBook)

现在我可以访问'/overview'和'/overview/：Id'。但不能访问其他人。没有为他们加载数据。您有任何解决方案吗？这样我就可以访问所有路线了。uuu