As we all know, Vue3.0 brings a brand new feature - Composition API. It literally means "combination API", which was created to implement a function-based logic reuse mechanism.
Review Option API
Before understanding Composition Api, first review the problems we encountered with Option Api. In Vue2, we often need to write code responsible for the same function in a specific area (data, methods, watch, computed...).
Defects of the Option API
With the increasing complexity of the business, the amount of code will continue to increase; because the code of related business needs to be written to a specific area according to the configuration of the option, the follow-up maintenance is very complicated, and the code reusability is not high.
Composition Api
Obviously we can organize our code and functions more elegantly. Let the code of related functions be organized together in a more orderly manner
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回复：compositionapi
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