Function and method in Vue.js are both used to define methods, but their scope and behavior are different. Function is defined outside the component or instance and cannot access component data, while method is defined within the component or instance and can access component data and trigger reactive updates. 1. function purpose: general function, does not involve component data. 2. Method purpose: component-specific functions or functions that need to access component data.
##Usage of function and method in Vue.js
In Vue.js,function and method are used to define methods in components or instances, but they have different scopes and behaviors.
function
function is a standard function declaration or expression in JavaScript and has no special meaning in Vue.js. They are defined outside the Vue instance or component and can be used in the component or template, but they cannot access the data and methods of the component or instance.
method
method is a Vue.js-specific keyword used to define methods in components or instances. They are related to the following properties:
- Scope: method
Binding to a component or instance allows access to the component or instance's data and methods. - Responsiveness: Changes made to the data in method
will trigger Vue's reactive system to update the component's view. - Usage: method
can be used from a component or template and is accessible through the component'sthiskeyword.
Purpose
function Used to define functions that are general or do not involve component data, for example:
// 在 Vue 實例外部
function formatDate(date) {
// ...業(yè)務邏輯
}
// 在 Vue 實例中
formatDate(new Date());method Used to define component-specific functions or functions that need to access component data, for example:
// 在 Vue 組件中
methods: {
save() {
this.data = { name: 'John Doe' };
}
}Usage rules
- function
can be defined and used in code at any time. - method
should be defined in themethodsoption, which is a property of the Vue component. - method
The name should be a string. - method
Can accept parameters.
Example
// Vue 組件
export default {
methods: {
// 方法
increment() {
this.count++;
},
// 通用函數(shù)（不涉及組件數(shù)據(jù)）
formatDate(date) {
// ...業(yè)務邏輯
}
}
}The above is the detailed content of Usage of function and method in vue. 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 the significance of Vue's reactivity transform (experimental, then removed) and its goals?
Jun 20, 2025 am 01:01 AM
ReactivitytransforminVue3aimedtosimplifyhandlingreactivedatabyautomaticallytrackingandmanagingreactivitywithoutrequiringmanualref()or.valueusage.Itsoughttoreduceboilerplateandimprovecodereadabilitybytreatingvariableslikeletandconstasautomaticallyreac
How can internationalization (i18n) and localization (l10n) be implemented in a Vue application?
Jun 20, 2025 am 01:00 AM
InternationalizationandlocalizationinVueappsareprimarilyhandledusingtheVueI18nplugin.1.Installvue-i18nvianpmoryarn.2.CreatelocaleJSONfiles(e.g.,en.json,es.json)fortranslationmessages.3.Setupthei18ninstanceinmain.jswithlocaleconfigurationandmessagefil
What is server side rendering SSR in Vue?
Jun 25, 2025 am 12:49 AM
Server-siderendering(SSR)inVueimprovesperformanceandSEObygeneratingHTMLontheserver.1.TheserverrunsVueappcodeandgeneratesHTMLbasedonthecurrentroute.2.ThatHTMLissenttothebrowserimmediately.3.Vuehydratesthepage,attachingeventlistenerstomakeitinteractive
What is the LEGB (Local, Enclosing, Global, Built-in) rule for scope resolution in Python?
Jun 19, 2025 am 12:41 AM
PythonusestheLEGBruletoresolvevariablenamesindifferentscopes.1.Local(L):Variablesdefinedinsidethecurrentfunction.2.Enclosing(E):Variablesinenclosingfunctions,searchedfromtheinsideout.3.Global(G):Variablesdefinedatthetoplevelofamoduleordeclaredglobal.
How to implement transitions and animations in Vue?
Jun 24, 2025 pm 02:17 PM
ToaddtransitionsandanimationsinVue,usebuilt-incomponentslikeand,applyCSSclasses,leveragetransitionhooksforcontrol,andoptimizeperformance.1.WrapelementswithandapplyCSStransitionclasseslikev-enter-activeforbasicfadeorslideeffects.2.Useforanimatingdynam
What is the purpose of the nextTick function in Vue, and when is it necessary?
Jun 19, 2025 am 12:58 AM
nextTick is used in Vue to execute code after DOM update. When the data changes, Vue will not update the DOM immediately, but will put it in the queue and process it in the next event loop "tick". Therefore, if you need to access or operate the updated DOM, nextTick should be used; common scenarios include: accessing the updated DOM content, collaborating with third-party libraries that rely on the DOM state, and calculating based on the element size; its usage includes calling this.$nextTick as a component method, using it alone after import, and combining async/await; precautions include: avoiding excessive use, in most cases, no manual triggering is required, and a nextTick can capture multiple updates at a time.
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.
How to use PHP to develop a Q&A community platform Detailed explanation of PHP interactive community monetization model
Jul 23, 2025 pm 07:21 PM
1. The first choice for the Laravel MySQL Vue/React combination in the PHP development question and answer community is the first choice for Laravel MySQL Vue/React combination, due to its maturity in the ecosystem and high development efficiency; 2. High performance requires dependence on cache (Redis), database optimization, CDN and asynchronous queues; 3. Security must be done with input filtering, CSRF protection, HTTPS, password encryption and permission control; 4. Money optional advertising, member subscription, rewards, commissions, knowledge payment and other models, the core is to match community tone and user needs.
