Shulou(Shulou.com)06/01 Report--

This article introduces the relevant knowledge of "what is the role of setup in vue". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

In vue, setup is used to encapsulate reuse; setup is designed to use combinatorial api, and when the component becomes larger, the list of logical concerns grows, making it difficult for the component to read and understand, and this part can be extracted into a function through setup, so you don't have to care about the logic of this part.

This article operating environment: windows10 system, Vue2.9.6 version, DELL G3 computer.

Why vue uses setup

What is the use of setup in vue3?

Setup is designed to use combined api

Why not use the options of the previous component

Data, computed, methods, watch organizational logic is valid in most cases. However, as our components become larger, the list of logical concerns grows. This can make components difficult to read and understand, especially for those who didn't write them in the first place. Through setup, this part can be extracted into functions, so that other developers do not have to care about this part of the logic.

Setup's position in the vue lifecycle

Setup is located in front of created and beforeCreated and is used to replace created and beforeCreated, but this is not accessible in the setup function. In addition, the entire lifecycle can be operated in setup through the following hook

What parameters can setup accept?

Setup can accept props,context. Because props is responsive data, it cannot deconstruct assignment directly. Context is not responsive data and can deconstruct assignment directly. Setup must return an object. Once return, you can use this attribute in the same way as vue2.x.

Props: ['test'] setup (props,context) {/ / const {test} = props / / wrong const {test} = toRefs (props) / / pair of const {attrs, slots, emit} = context / / pair of return {test}}

Priority. If all data,props,setup have an attribute with the same name, the attribute returned by setup has the highest priority. Taking the execution of the following code as an example, it will be displayed: test from son's setup

For encapsulation reusability

Projects or applications should not only talk about implementation, but also consider continuous integration and multi-person collaboration. Because the business complexity of the front end is too low, you can solve the problem by using componentization or holding up the last global state management. At most, it takes a little bit of work, but now it is not very good. The front and back end interface calls are too wasteful and efficient, so it is very necessary to have a better architecture. So that the front end can have complete encapsulation reusability support (that is, full programming ability), so that hold can live in the location of the view service in the cluster.

This is the end of the content of "what is the role of setup in vue". Thank you for your reading. If you want to know more about the industry, you can follow the website, the editor will output more high-quality practical articles for you!

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.