Introduction to vue life cycle hook hook functions (with examples)
This article brings you an introduction to the hook function of the vue life cycle (with examples). It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.
Life cycle hook functions of Vue instances (8)
1. beforeCreate
I just created a new component and cannot access the data and real DOM. Basically, this seems to be useless
2. created
The data attribute has been assigned a value. The data can be modified but updated will not be triggered. Here you can obtain the initial data
3. beforeMount
Render is ready to be rendered. The virtual dom in the function has been created. Changing the data at this time will not trigger update. Here you can obtain the initial data
4. mounted
Start render, render the real DOM, and execute the mounted hook function. The component has appeared on the page, and the data and events have been processed by the DOM. Here you can change to perform real DOM operations
5, beforeUpdate
Component, a function that will be executed before the instance data is updated, the virtual DOM will rebuild the virtual DOM, and the last virtual DOM Re-render after comparison. Remember not to modify the data otherwise an infinite loop will occur
6、updated
Functions that will be executed after updating. Remember not to modify the data otherwise an infinite loop will occur
7、 beforeDestroy
Function that will be executed before the instance is destroyed, do the aftermath work, clear the timer, clear non-instruction bound events, etc.
8、destroyed
Example The function that will be executed after being destroyed can also do the aftermath work.
<template>
<div>
Hello World!
</div>
</template>
<script>
export default {
name: "HelloWorld",
data() {
return {
msg: "Welcome to Your Vue.js App"
};
},
beforeCreate: function() {
console.log("data属性光声明没有赋值的时候");
},
created: function() {
console.log("data属性完成了赋值");
},
beforeMount: function() {
console.log("页面上的{{name}}还没有被渲染成真正的数据");
},
mounted: function() {
console.log("页面上的{{name}}被渲染成真正的数据");
},
beforeUpdate: function() {
console.log(" 数据（data属性）更新之前会执行的函数");
},
updated: function() {
console.log("数据（data属性）更新完会执行的函数");
},
beforeDestroy: function() {
console.log("实例被销毁之前会执行的函数");
},
destroyed: function() {
console.log("实例被销毁后会执行的函数");
}
};
</script>
<style>
</style>
console这样一个输出顺序：
This is roughly the order in which life cycle hook functions are executed, including the fact that I used angular to develop like vue. It also has its own life cycle hook function.
The life cycle is simply a process from creation to initialization to destruction of a component. In this process, with these life cycle hook functions, we can operate the entire component more conveniently.
The above is the detailed content of Introduction to vue life cycle hook hook functions (with examples). For more information, please follow other related articles on the PHP Chinese website!
JavaScript in Action: Real-World Examples and ProjectsApr 19, 2025 am 12:13 AMJavaScript's application in the real world includes front-end and back-end development. 1) Display front-end applications by building a TODO list application, involving DOM operations and event processing. 2) Build RESTfulAPI through Node.js and Express to demonstrate back-end applications.
JavaScript and the Web: Core Functionality and Use CasesApr 18, 2025 am 12:19 AMThe main uses of JavaScript in web development include client interaction, form verification and asynchronous communication. 1) Dynamic content update and user interaction through DOM operations; 2) Client verification is carried out before the user submits data to improve the user experience; 3) Refreshless communication with the server is achieved through AJAX technology.
Understanding the JavaScript Engine: Implementation DetailsApr 17, 2025 am 12:05 AMUnderstanding how JavaScript engine works internally is important to developers because it helps write more efficient code and understand performance bottlenecks and optimization strategies. 1) The engine's workflow includes three stages: parsing, compiling and execution; 2) During the execution process, the engine will perform dynamic optimization, such as inline cache and hidden classes; 3) Best practices include avoiding global variables, optimizing loops, using const and lets, and avoiding excessive use of closures.
Python vs. JavaScript: The Learning Curve and Ease of UseApr 16, 2025 am 12:12 AMPython is more suitable for beginners, with a smooth learning curve and concise syntax; JavaScript is suitable for front-end development, with a steep learning curve and flexible syntax. 1. Python syntax is intuitive and suitable for data science and back-end development. 2. JavaScript is flexible and widely used in front-end and server-side programming.
Python vs. JavaScript: Community, Libraries, and ResourcesApr 15, 2025 am 12:16 AMPython and JavaScript have their own advantages and disadvantages in terms of community, libraries and resources. 1) The Python community is friendly and suitable for beginners, but the front-end development resources are not as rich as JavaScript. 2) Python is powerful in data science and machine learning libraries, while JavaScript is better in front-end development libraries and frameworks. 3) Both have rich learning resources, but Python is suitable for starting with official documents, while JavaScript is better with MDNWebDocs. The choice should be based on project needs and personal interests.
From C/C to JavaScript: How It All WorksApr 14, 2025 am 12:05 AMThe shift from C/C to JavaScript requires adapting to dynamic typing, garbage collection and asynchronous programming. 1) C/C is a statically typed language that requires manual memory management, while JavaScript is dynamically typed and garbage collection is automatically processed. 2) C/C needs to be compiled into machine code, while JavaScript is an interpreted language. 3) JavaScript introduces concepts such as closures, prototype chains and Promise, which enhances flexibility and asynchronous programming capabilities.
JavaScript Engines: Comparing ImplementationsApr 13, 2025 am 12:05 AMDifferent JavaScript engines have different effects when parsing and executing JavaScript code, because the implementation principles and optimization strategies of each engine differ. 1. Lexical analysis: convert source code into lexical unit. 2. Grammar analysis: Generate an abstract syntax tree. 3. Optimization and compilation: Generate machine code through the JIT compiler. 4. Execute: Run the machine code. V8 engine optimizes through instant compilation and hidden class, SpiderMonkey uses a type inference system, resulting in different performance performance on the same code.
Beyond the Browser: JavaScript in the Real WorldApr 12, 2025 am 12:06 AMJavaScript's applications in the real world include server-side programming, mobile application development and Internet of Things control: 1. Server-side programming is realized through Node.js, suitable for high concurrent request processing. 2. Mobile application development is carried out through ReactNative and supports cross-platform deployment. 3. Used for IoT device control through Johnny-Five library, suitable for hardware interaction.
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
AI Hentai Generator
Generate AI Hentai for free.
Hot Article
Hot Tools
mPDF
mPDF is a PHP library that can generate PDF files from UTF-8 encoded HTML. The original author, Ian Back, wrote mPDF to output PDF files "on the fly" from his website and handle different languages. It is slower than original scripts like HTML2FPDF and produces larger files when using Unicode fonts, but supports CSS styles etc. and has a lot of enhancements. Supports almost all languages, including RTL (Arabic and Hebrew) and CJK (Chinese, Japanese and Korean). Supports nested block-level elements (such as P, DIV),
SublimeText3 English version
Recommended: Win version, supports code prompts!
SublimeText3 Chinese version
Chinese version, very easy to use
Dreamweaver Mac version
Visual web development tools
VSCode Windows 64-bit Download
A free and powerful IDE editor launched by Microsoft
