How to solve the problem 'Uncaught TypeError: Cannot read property 'push' of undefined' when using vue-router in a Vue application?

Recently I tried to use vue-router in a Vue application, but encountered a problem: "Uncaught TypeError: Cannot read property 'push' of undefined". What is the cause of this problem and how to solve it?

First, let us understand vue-router. vue-router is the official routing management plug-in of Vue.js, which can help us build single-page applications (SPA). It allows us to switch between different views without refreshing the page, making our applications more efficient and smooth.

The common error message "Uncaught TypeError: Cannot read property 'push' of undefined" means that you are trying to call an object or property that does not exist. In vue-router applications, this is usually caused by one of the following reasons:

1. Wrong introduction method

Make sure your routing component and router object are both correctly introduced. Make sure you are using the correct name and path.

2. The router is not configured correctly

Make sure your router instance is configured correctly. For example, did you call the Vue.use(Router) method correctly?

3. Router instance not created

Make sure you have created a Vue-Router instance and pass it to the router option of the Vue instance.

Next, let’s see how to solve this problem. Here are several possible solutions:

1. Check the router introduction method

Make sure that your routing components and router objects are imported correctly. If you are using ES6 modules, make sure your module statements export and import correctly, for example:

// router.js

import Vue from 'vue'
import Router from 'vue-router'

Vue.use(Router)

export default new Router({
  routes: [
    // your routes here
  ]
})

// YourComponent.vue

import Vue from 'vue'
import Router from '@/router'

export default Vue.extend({
  router: Router,
  // your component definition here
})

2. Check the router instance configuration

Make sure your router instance is correct configuration. For example, using the example above, you could follow these steps:

• Create a file "router.js" and define the router instance in it.
• Import Vue and Vue Router libraries.
• Use the Vue.use(Router) method to register the Vue Router plug-in.
• Create and export a new router instance containing the routes you want to use in your application.

3. Check if you have created the router instance

Make sure you introduce the newly created router instance in the Vue instance. For example:

// app.js

import Vue from 'vue'
import Router from '@/router'

new Vue({
  router: Router,
  // your app definition here
})

In my case, I checked that my router instance was created, configured and referenced correctly, and as soon as I found the problem, the error was resolved.

To summarize, when the "Uncaught TypeError: Cannot read property 'push' of undefined" error occurs when using vue-router in a Vue application, you need to check the router introduction method, router instance configuration and whether it has been created Router instance. By troubleshooting these issues, you can easily resolve this issue and build your application using the Vue Router plugin smoothly.

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