Let's talk about the life cycle of vue (hook function)

The Vue cycle is the life cycle of the Vue instance and is a very important concept in the Vue framework. The Vue cycle can help us understand the creation, update, and destruction process of Vue instances, so as to better master the usage methods and techniques of the Vue framework.

The Vue cycle can be divided into several stages. Each stage will trigger different hook functions (life cycle functions), and corresponding logic codes can be written in the hook functions. These hook functions mainly include the following:

1. beforeCreate: called when the instance has just been created, the data and methods have not been initialized, that is, the data and methods are empty, and the instance has not been mounted to the DOM. superior.
2. created: Called after the instance has been created. At this time, the data has been initialized, but the template has not yet been compiled into a DOM node, and the instance has not yet been mounted on the DOM.
3. beforeMount: Called before the instance is mounted to the DOM. At this time, the template has been compiled but has not yet been rendered into a DOM node.
4. mounted: Called after the instance is mounted to the DOM. At this time, the instance has been successfully rendered into a DOM node and DOM operations can be performed.
5. beforeUpdate: Called before the data is updated. At this time, the data has changed, but the DOM node has not been re-rendered.
6. updated: Called after the data update is completed. At this time, the data and DOM nodes have been updated and DOM operations can be performed.
7. beforeDestroy: Called before the instance is destroyed. At this time, the instance still exists and the final operation can be performed.
8. destroyed: Called after the instance is destroyed. At this time, the instance has been destroyed and no operations can be performed.

The Vue cycle can help us better understand the status of the Vue instance at different stages, and we can write corresponding logic code in the hook function to achieve more powerful functions. For example, we can do some initialization operations in the beforeCreate hook function, such as loading some data, adding some global events, etc. DOM operations can be performed in the mounted hook function, such as operating some form data, binding some events, etc. In the destroyed hook function, you can destroy some global resources, unbind some events, etc.

In short, the Vue cycle is an important concept in the Vue framework. Mastering the Vue cycle can help us better understand the usage methods and techniques of the Vue framework. By making good use of the Vue cycle, we can achieve more powerful functions.

The above is the detailed content of Let's talk about the life cycle of vue (hook function). For more information, please follow other related articles on the PHP Chinese website!