ReferenceError: router is not defined
时间: 2023-08-26 19:04:57 浏览: 58
This error occurs when you try to use the variable or object "router" without defining it first. In JavaScript, variables and objects need to be declared before they can be used in the code.
To fix this error, you need to make sure that "router" is declared and initialized properly before using it in your code. This can be done by creating an instance of the router object or importing it from a module.
For example, if you are using the Express.js framework, you can define a router object like this:
```
const express = require('express');
const router = express.Router();
// define routes using router object
router.get('/', function(req, res) {
res.send('Hello World!');
});
// export router object to be used in other files
module.exports = router;
```
Then, you can import and use the router object in another file like this:
```
const router = require('./router');
// use router object to handle requests
app.use('/', router);
```