What is the purpose of uniapp lifecycle hooks?

The hook functions in UniApp are used to control the page lifecycle and page state changes. They have various functions, including:

1. beforeCreate: Executed before the page instance is created, allowing for some initialization operations to be performed.
2. Executed after the page instance is created, you can perform some data initialization and asynchronous requests.
3. beforeMount: Executes before the page is mounted to the node, where some operations before page rendering can be performed.
4. Mounted: Execute after the page is mounted to the node, where you can perform operations after page rendering, such as accessing DOM elements.
5. beforeUpdate: Executed before the page data is updated, where operations before updating the data can be performed here.
6. After the page data has been updated, you can perform some operations related to the updated data here.
7. beforeDestroy: Execute before the page instance is destroyed, where you can perform some cleanup operations such as clearing timers or canceling subscriptions.
8. Destroyed: Executed after the page instance is destroyed, where some final cleanup operations can be performed.

By using hook functions, we can perform corresponding operations at different stages of the page’s lifecycle to control the behavior and state of the page.