Lifecycle function implementation principles and application methods in Vue documentation

Vue is a popular JavaScript framework that allows developers to build interactive user interfaces more easily. In the Vue documentation, lifecycle functions are one of the very important concepts. This article will introduce the implementation principles and application methods of Vue life cycle functions.

Vue's life cycle function can be divided into eight different stages: creation, mounting, updating, and destruction. Each stage has specific life cycle functions, including: beforeCreate, created, beforeMount, mounted, beforeUpdate, updated, beforeDestroy, destroyed. These life cycle functions can be automatically called during the life cycle of the Vue component, thereby helping us execute specific business logic at different stages.

First, let’s understand the implementation principle of Vue life cycle function. In the Vue project created by the scaffolding, the Vue instance is implemented by inheriting the Vue prototype. Vue's life cycle function is called in the life cycle method defined by Vue. To put it simply, when Vue creates an instance, it registers different life cycle functions in the initialization phase and automatically calls the life cycle functions in the corresponding phases.

Next, let’s take a look at how to apply the Vue life cycle function. By using different lifecycle functions, we can perform different tasks in different stages of Vue component running. Specifically:

• The beforeCreate and created hook functions can be used for global configuration, injecting plug-ins, etc., but in most cases, they will be used to perform initial data setting work.
• The beforeMount and mounted hook functions are used to apply the component tree and perform the first rendering during Vue's mounting process. You can perform tasks such as network requests or setting timers at this time.
• The beforeUpdate and updated hook functions are used to update the Vue instance when the data changes, and can also perform other tasks that must be completed when updating the data.
• The beforeDestroy and destroyed hook functions are used to perform necessary cleanup operations before the Vue component is destroyed, such as clearing timers, canceling subscriptions, etc.

In addition to the above common usages, life cycle functions can also be combined with other Vue features, such as component communication and animation effects. For example, using a third-party plug-in vue-transition, you can insert CSS animations into different life cycle hook functions to obtain a more vivid application interface.

In short, Vue's life cycle function is a very important concept, which is automatically called during the life cycle of the Vue component, thereby helping us execute specific business logic at different stages. When using Vue to develop applications, we should make full use of the characteristics of Vue's life cycle functions to optimize the implementation of different functions in the application.

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