In-depth understanding of Vue's component life cycle
In-depth understanding of Vue’s component life cycle requires specific code examples
Introduction:
Vue.js is a progressive JavaScript framework that is simple and easy to learn. , efficient and flexible features and are favored by developers. In the component development of Vue, understanding the life cycle of components is an important part. This article will delve into the life cycle of Vue components and provide specific code examples to help readers better understand and apply them.
1. Life cycle diagram of Vue component
The life cycle of Vue component can be seen as the entire process from creation to destruction of the component. The figure below is a life cycle diagram of a Vue component, including hook functions at different stages. When a component is created, it will go through the "creation phase", "mounting phase", "update phase" and "destruction phase" in sequence.
(Insert life cycle icon)
2. Specific stages and hook functions of Vue component life cycle
-
Creation phase(Creation)
- beforeCreate: Called after instance initialization and before data observer and event/watcher event configuration. At this time, the data and events in the component have not yet been initialized.
- created: Called after the instance is created. At this point, the data in the component can already be accessed, and operations such as data initialization can be performed.
-
Mounting phase (Mounting)
- beforeMount: Called before the template is rendered into HTML. At this point, the template has been compiled but has not yet been mounted on the page.
- mounted: Called after the template is rendered into HTML. At this point, the component has been mounted to the page and DOM operations can be performed.
-
Updating phase (Updating)
- beforeUpdate: Called before the responsive data changes and the virtual DOM is re-rendered. At this point, the data in the component has changed, but the DOM has not yet been updated.
- updated: Called after the virtual DOM is re-rendered and patched. At this time, the component's data has been updated, and the DOM has also been updated.
-
Destruction phase (Destruction)
- beforeDestroy: Called before the instance is destroyed. At this point, the component has not been destroyed and the component's data and methods can still be accessed.
- destroyed: Called after the instance is destroyed. At this point, the component has been destroyed and the component's data and methods can no longer be accessed.
3. Code example
<template> <div> <p>组件生命周期示例</p> <p>{{ message }}</p> </div> </template> <script> export default { data() { return { message: 'Hello, Vue!' } }, beforeCreate() { console.log('组件创建阶段:beforeCreate') }, created() { console.log('组件创建阶段:created') }, beforeMount() { console.log('组件挂载阶段:beforeMount') }, mounted() { console.log('组件挂载阶段:mounted') }, beforeUpdate() { console.log('组件更新阶段:beforeUpdate') }, updated() { console.log('组件更新阶段:updated') }, beforeDestroy() { console.log('组件销毁阶段:beforeDestroy') }, destroyed() { console.log('组件销毁阶段:destroyed') } } </script>
The above code is a simple Vue component example. At different life cycle stages, we use console output to view the execution of the hook function. You can run the example through the following steps:
- Create a Vue project and introduce the above component files.
Use the above component in the parent component:
<template> <div> <child-component></child-component> </div> </template> <script> import ChildComponent from '@/components/ChildComponent.vue' export default { components: { ChildComponent } } </script>
Copy after login- Run the project, view the console output, and observe the life cycle of the component.
By running the example, we can clearly see the execution sequence of the component's life cycle hook functions in different stages, and then gain an in-depth understanding of the life cycle of the Vue component.
Conclusion:
The life cycle of Vue components is an important concept in Vue, which is very helpful for understanding the creation, destruction and update process of Vue components. Through the introduction and sample code of this article, readers can have a deeper understanding of the life cycle of Vue components and flexibly apply them in actual development.
The above is the detailed content of In-depth understanding of Vue's component life cycle. For more information, please follow other related articles on the PHP Chinese website!

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

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)

Hot Topics

With the continuous development of front-end technology, Vue has become one of the popular frameworks in front-end development. In Vue, components are one of the core concepts, which can break down pages into smaller, more manageable parts, thereby improving development efficiency and code reusability. This article will focus on how Vue implements component reuse and extension. 1. Vue component reuse mixins Mixins are a way to share component options in Vue. Mixins allow component options from multiple components to be combined into a single object for maximum

Vue component communication: Use $destroy for component destruction communication In Vue development, component communication is a very important aspect. Vue provides a variety of ways to implement component communication, such as props, emit, vuex, etc. This article will introduce another method of component communication: using $destroy for component destruction communication. In Vue, each component has a life cycle, which includes a series of life cycle hook functions. The destruction of components is also one of them. Vue provides a $de

Vue Practical Combat: Date Picker Component Development Introduction: The date picker is a component often used in daily development. It can easily select dates and provides various configuration options. This article will introduce how to use the Vue framework to develop a simple date picker component and provide specific code examples. 1. Requirements analysis Before starting development, we need to conduct a requirements analysis to clarify the functions and characteristics of the components. According to the common date picker component functions, we need to implement the following function points: Basic functions: able to select dates, and

Vue component communication: using watch and computed for data monitoring Vue.js is a popular JavaScript framework, and its core idea is componentization. In a Vue application, data needs to be transferred and communicated between different components. In this article, we will introduce how to use Vue's watch and computed to monitor and respond to data. watch In Vue, watch is an option, which can be used to monitor the changes of one or more properties.

In Vue development, we often encounter situations where we deal with complex data structures and algorithms. These problems may involve a large number of data operations, data synchronization, performance optimization, etc. This article will introduce some considerations and techniques for dealing with complex data structures and algorithms to help developers better deal with these challenges. 1. Selection of data structures When dealing with complex data structures and algorithms, it is very important to choose appropriate data structures. Vue provides a wealth of data structures and methods, and developers can choose the appropriate data structure according to actual needs. commonly used numbers

Vue is a popular JavaScript framework that provides a wealth of tools and features to help us build modern web applications. Although Vue itself already provides many practical functions, sometimes we may need to use third-party libraries to extend Vue's capabilities. This article will introduce how to use third-party libraries in Vue projects and provide specific code examples. 1. Introduce third-party libraries The first step to using third-party libraries in a Vue project is to introduce them. We can introduce it in the following ways

Vue component development: Tab component implementation method In modern web applications, the tab page (Tab) is a widely used UI component. The Tab component can display multiple related content on a single page and switch them by clicking on the tab. In this article, we will introduce how to implement a simple tab component using Vue.js and provide detailed code examples. The structure of the Vue tab component. The tab component usually consists of two parts: tab and panel. Labels are used to identify surfaces

Vue component communication: Using vuex for state management communication Introduction: In Vue development, communication between components is a key issue. Vue provides a variety of ways to implement component communication, among which using vuex for state management is a common way. This article will introduce how to use vuex for component communication, and provide code examples to help readers better understand. 1. What is vuexVuex is the official state management library of Vue.js, which can realize global state management and communication between components. Vue
