The core methods for extending Vue instances include: 1. Mixin mixed in public logic, suitable for multiple components to share options such as data, methods, and lifecycle hooks; 2. Use extends to extend existing constructors, suitable for inheritance based on basic classes; 3. Use the Composition API in Vue 3 to extract reusable logic. The life cycle in Mixins will be executed before the component itself, and the method of the same name is mainly composed of components; extends is mainly used to create derived constructors; the Composition API uses function combination logic to avoid naming conflicts and improve maintenance. When using it, you should pay attention to the merge strategy, avoid overuse of mixin, and give priority to the composition function method recommended by Vue 3.
To extend a Vue instance, the core approach is to use mixins , extends , or using the Composition API (Vue 3). These methods can help you reuse logic or configurations between multiple components or instances.
Mix in public logic using Mixin
Mixin is the most common and direct way to extend it, suitable for situations where multiple components need to share certain options.
- You can mix data, methods, life cycle hooks and other contents
- If there is a conflict with the component itself, such as methods of the same name, the default component is mainly used. Mixin's will be merged but may be overwritten.
Let's give a simple example:
const myMixin = {
created() {
console.log('Mixin created hook called')
},
methods: {
sayHello() {
console.log('Hello from mixin')
}
}
}
new Vue({
el: '#app',
mixins: [myMixin],
created() {
console.log('Component created hook called')
}
}) The instances created in this way will have the content defined in the mixin at the same time, and both created hooks will be executed (first the mixin and then the component itself).
Extend a single configuration with extends
If you just want to make some minor changes based on an existing Vue constructor, you can use extends .
It is similar to the inheritance mechanism in object-oriented and is suitable for extensions of basic classes.
const BaseComponent = Vue.extend({
data() {
return {
message: 'Base message'
}
}
})
const ExtendedComponent = BaseComponent.extend({
data() {
return {
message: 'Extended message'
}
}
}) Note: extends are mainly used for the extension of constructors, while mixins tend to combine multiple behaviors together.
Composition logic using Composition API in Vue 3
In Vue 3, it is recommended to use the Composition API to organize reusable logical blocks. You can extract the general function into functions and call it in different components.
For example:
// useCounter.js
export function useCounter() {
const count = ref(0)
function increment() {
count.value
}
return { count, increment }
}
// Use import { useCounter } from './useCounter' in the component
export default {
setup() {
const { count, increment } = useCounter()
return { count, increment }
}
}This method is clearer than mixin, avoids naming conflicts, and is easier to test and maintain.
Tips and precautions
- Mixins is good, don't abuse it : too many mixins can make the code difficult to track, especially in large projects that can easily cause confusion.
- Priority to Composition API : Vue 3 It is recommended to use the composition function instead of mixin, which has clearer logic.
- Note for merging strategies : for example, data must be a function, otherwise the state will be shared; the life cycle hooks will be executed in sequence.
- Extends is suitable for basic class extensions : for example, you have a basic component, and other components derive some custom content from it.
Basically these commonly used methods. Each method has applicable scenarios, just choose the appropriate expansion method according to the project structure and personal preferences.
The above is the detailed content of How to extend a Vue instance?. For more information, please follow other related articles on the PHP Chinese website!
Hot AI Tools
Undress AI Tool
Undress images for free
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
What is headless UI in Vue?
Jul 08, 2025 am 01:38 AM
HeadlessUIinVue refers to a library of UI components that provide no preset styles and only contains core logic and behavior. Its features include: 1. No style restrictions, developers can customize the design; 2. Focus on barrier-free and interactive logic, such as keyboard navigation, state management, etc.; 3. Support Vue framework integration, exposing the control interface through combinable functions or components. Reasons for use include: maintaining design consistency, built-in accessibility, strong component reusability, and lightweight library size. In practical applications, developers need to write HTML and CSS themselves. For example, when building a drop-down menu, the library handles state and interaction, while developers decide on visual presentation. Mainstream libraries include HeadlessUI and RadixVue for TailwindLabs, suitable for
How to watch nested properties in Vue 3?
Jul 07, 2025 am 12:51 AM
In Vue3, there are three ways to monitor nested properties using the watch function: 1. Use the getter function to accurately monitor specific nested paths, such as watch(()=>someObject.nested.property,callback); 2. Add the {deep:true} option to deeply monitor changes within the entire object, which is suitable for situations where the structure is complex and does not care about which property changes; 3. Return an array in the getter to listen to multiple nested values ??at the same time, which can be used in combination with deep:true; in addition, if ref is used, the nested properties in its .value need to be tracked through getter.
How to build a component library with Vue?
Jul 10, 2025 pm 12:14 PM
Building a Vue component library requires designing the structure around the business scenario and following the complete process of development, testing and release. 1. The structural design should be classified according to functional modules, including basic components, layout components and business components; 2. Use SCSS or CSS variables to unify the theme and style; 3. Unify the naming specifications and introduce ESLint and Prettier to ensure the consistent code style; 4. Display the usage of components on the supporting document site; 5. Use Vite and other tools to package as NPM packages and configure rollupOptions; 6. Follow the semver specification to manage versions and changelogs when publishing.
Key differences between Vue 2 and Vue 3?
Jul 09, 2025 am 01:29 AM
Vue3 has improved in many key aspects compared to Vue2. 1.Composition API provides a more flexible logical organization method, allowing centralized management of related logic, while still supporting Vue2's Options API; 2. Better performance and smaller package size, the core library is reduced by about 30%, the rendering speed is faster and supports better tree shake optimization; 3. The responsive system uses ES6Proxy to solve the problem of unable to automatically track attribute addition and deletion in Vue2, making the responsive mechanism more natural and consistent; 4. Built-in better support for TypeScript, support multiple node fragments and custom renderer API, improving flexibility and future adaptability. Overall, Vue3 is a smooth upgrade to Vue2,
How to create a Vue 3 project with Vite?
Jul 05, 2025 am 01:39 AM
It is recommended to use Vite to create Vue3 projects because it uses the browser's native ES module support and has a fast startup speed in development mode. 1. Make sure to install Node.js (16.x or higher) and npm/yarn/pnpm; 2. Run npmcreatevite@latestmy-vue-app--templatevue initialization project; 3. Follow the prompts to select TypeScript, VueRouter and other configurations; 4. Execute cdmy-vue-app and npminstall installation dependencies; 5. Use npmrundev to start the development server. Optional configurations include automatic browser opening, proxy settings, alias paths, and packaging optimizations. Recommended insurance
How to define routes in vue router?
Jul 05, 2025 am 12:58 AM
Defining routes in Vue projects requires understanding the structure and configuration. The steps are as follows: 1. Install and introduce vue-router, create a routing instance, and pass in a routes array containing path and component; 2. Use dynamic routing matching such as /user/:id to obtain parameters; 3. Use children attribute to implement nested routes; 4. Name the routes with the name attribute for jumping; 5. Use redirect for path redirect. After mastering these core points, you can configure routing efficiently.
Benefits of using ?
Jul 08, 2025 am 12:20 AM
? in regular expressions are used to convert greedy matches to non-greedy, achieving more accurate matches. 1. It makes the content as little as possible to match as little as possible to avoid mismatch across tags or fields; 2. It is often used in scenarios such as HTML parsing, log analysis, URL extraction, etc. that require precise control of the scope; 3. When using it, it is necessary to note that not all quantifiers are applicable. Some tools need to manually enable non-greedy mode, and complex structures need to be combined with grouping and assertions to ensure accuracy. Mastering this technique can significantly improve text processing efficiency.
What is CORS and how does it affect Vue development?
Jul 07, 2025 am 12:11 AM
CORSissuesinVueoccurduetothebrowser'ssame-originpolicywhenthefrontendandbackenddomainsdiffer.Duringdevelopment,configureaproxyinvue.config.jstoredirectAPIrequeststhroughthedevserver.Inproduction,ensurethebackendsetsproperCORSheaders,allowingspecifico
