Vue.js is a popular JavaScript framework that provides a series of lifecycle hook functions that allow developers to execute custom logic at different stages of components. The following is a detailed introduction of all life cycle hook functions of Vue.js:
beforeCreate：
- How to use: Called immediately before the component instance is created, and the component's data, events, etc. have not been initialized yet.
- Parsing Note: In this hook function, options such as data and methods of the component cannot be accessed, and it is mainly used to initialize some states or data.
created：
- How to use: Called immediately after the component instance is created. At this time, the data of the component has been initialized, but not yet mounted on the DOM.
- Parsing Notes: Usually, initialization operations such as asynchronous operations and data requests are performed in this hook function. It is the first hook that can access data in the life cycle of a Vue instance.
beforeMount：
- How to use: Called immediately before the component is mounted to the DOM.
- Parsing Notes: In this hook function, the template has been compiled, but the generated DOM has not been replaced on the page.
mounted：
- How to use: Called immediately after the component is mounted to the DOM.
- Parsing Notes: In this hook function, the component has been mounted on the page, and can perform DOM operations and call other third-party libraries.
beforeUpdate：
- How to use: Called when the data is updated, but before the DOM is re-rendered.
- Parsing Note: In this hook function, you can access the data and state before the update, but you cannot directly modify the data.
updated：
- How to use: Called after the data is updated and the DOM is re-rendered.
- Parsing annotation: In this hook function, some operations that depend on the updated DOM can be performed.
beforeDestroy：
- How to use: Called before the component is destroyed.
- Parsing Note: In this hook function, the component instance is still fully available, and some cleanup operations can be performed, such as unsubscribing, clearing timers, etc.
destroyed：
- How to use: Called after the component is destroyed.
- Parsing Note: In this hook function, the component instance has been destroyed, and the data and methods of the component can no longer be accessed.
activated：
- How to use: Called when the component wrapped with <keep-alive> is activated.
- Parsing annotation: In this hook function, you can access the data and methods of the component, which is usually used to process the logic when the component is cached.
deactivated：
- How to use: Called when the component wrapped with <keep-alive> is deactivated.
- Parsing annotation: In this hook function, you can access the data and methods of the component, which is usually used to process the logic when the component is cached.
The above is a detailed introduction of all life cycle hook functions of Vue.js. By properly using these hook functions, you can execute custom logic at different lifecycle stages of components, so as to better control and manage the behavior of Vue components. Hope this article is helpful to you, if you have other questions or need more technical information, please feel free to contact me.