How to solve the problem "Error: "xxx" is not a constructor" when using vue-router in a Vue application?

Vue is a popular JavaScript framework that can be used to build single-page applications. One of the important components is vue-router, which allows us to navigate easily between applications.

However, sometimes when using vue-router, you may encounter the error "Error: xxx is not a constructor". This error is usually caused by the following reasons:

1. vue-router is not introduced correctly

When using vue-router in a Vue application, you must first introduce it . If imported incorrectly, it cannot be used. Please check whether vue-router is correctly introduced in your code. Normally, you need to introduce it in the main.js file in your Vue project:

import Vue from 'vue'
import VueRouter from 'vue-router'

Vue.use(VueRouter)

const router = new VueRouter({
  routes: [...],
})

new Vue({
  router,
  render: (h) => h(App),
}).$mount('#app')

If you have introduced vue-router but still encounter constructor errors, then it is most likely that Due to the next reason:

2. Naming conflict

Since variables and functions in JavaScript are globally scoped, if your Vue application exists with vue- If a component or function in the router has a variable or function with the same name, a naming conflict is likely to occur.

For example, if you define a component or variable named "Router" in a Vue application, an error similar to "Error: Router is not a constructor" will occur. The solution to this problem is simple, just change your component or variable name to a different name to avoid naming conflicts.

3. Version compatibility issues

Vue and vue-router are both in the stage of continuous update and iteration. If you use the latest version of Vue and use an old version vue-router, you are likely to encounter a constructor error.

At this point, you need to upgrade to the latest version of vue-router, or downgrade to a vue-router version that is compatible with the Vue version you are using. Normally, you can find the version compatibility table in the official documentation of Vue and vue-router to know which version of vue-router is compatible with your version of Vue.

Summary:

The above are three common reasons and solutions for "Error: xxx is not a constructor" when using vue-router in Vue applications.

When encountering a problem, it is recommended to first troubleshoot according to the correctness of the code, introduction name and version compatibility. In addition, you can also find help in the official forums or Github repositories of Vue and vue-router.

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