express router.param（[name] callback）为什么name传数组多个

Question

const express = require('express')

const router = express.Router()

const Student = require('../students')

router.param(['id','page'], function (req, res, next, value) {

    console.log('11', value);

    next();

  })

router.get('/user/:id/:page', function (req, res, next) {

    console.log('22');

    next();

});

  

router.get('/user/:id/:page', function (req, res) {

    console.log('33');

    res.end();

});

//浏览器  

http://localhost:3000/user/42/2323

//控制台结果

[nodemon] restarting due to changes...

[nodemon] starting `node app.js`

app is running at port 3000

22

33

//数组里面只有一个值，或者第一个参数直接传一个param

const express = require('express')

const router = express.Router()

const Student = require('../students')

router.param(['id'], function (req, res, next, value) {

    console.log('11', value);

    next();

  })

router.get('/user/:id', function (req, res, next) {

    console.log('22');

    next();

});

  

router.get('/user/:id', function (req, res) {

    console.log('33');

    res.end();

});

//浏览器  

http://localhost:3000/user/42

//控制台结果

[nodemon] restarting due to changes...

[nodemon] restarting due to changes...

[nodemon] starting `node app.js`

app is running at port 3000

11 42

22

33

不知道为什么 按官方文档来的， 第一个参数传数组且多个param 就进不去，求大佬们帮助下

Answer 1

最后发现原因是 router.param 不接受多参数的， 但是express中文文档没人维护 API没更新，引发的错误。