从控制器

Question

我想访问app.get（index.js）中app.use（idCtrl.js）中定义的param。下面我有一个我的代码的简化版本。该路线有效并将我发送给控制器以获取/1234等网址，但我无法从:id访问req.params。

index.js

var express = require('express');
var app     = express();
var idCtrl  = require('./idCtrl');
...
app.use('/:id([0-9]{4})', idCtrl);

idCtrl.js

var express = require('express');
var router  = express.Router();
...
router.get('/', function(req, res){
  // I wanna access :id from the app.use in index.js
});
...

Answer 1

处理这种情况的正确方法是

首先，设置你的参数

router.param('id',function(req,res,next,id)
{
     //d owhatever you want with your param here
     req.paramID = id; // save it in your req
     next(); // Continue to your get('/:id')
};

然后，使用参数

设置路线

router.get('/:id', function(req, res){
      console.log(req.paramID); // You got your param here
});