Detailed explanation of ref function in Vue3: application of direct access to component elements

In Vue3, the ref function is very useful and provides a very convenient operation method during the development process. It allows direct access to Vue component elements and manipulation of them.

The ref function is a function that creates an object that is responsively bound. You can use this within a Vue component to reference an element or subcomponent and operate on those elements or subcomponents from the parent component.

The ref function returns a responsive object and exposes a reference to the specified element or subcomponent through the object. Therefore, you can directly access the element or subcomponent through this object and perform operations in the Vue component.

Here is a simple example:

In this example, we define a button element referencemyBtnand append it torefFunction and bound a click eventhandleClick. In thesetupof the component instance, we return this reference and thehandleClickfunction so that we can use them in the template. At the same time, we modified the content of the button element in thehandleClickfunction.

In this way, we can easily reference elements and operate on them in Vue components without having to go through DOM operations.

In addition to referencing elements, ref can also refer to subcomponents. Here's an example of referencing a child component:

In this example, we're referencing the child componentChildin a very similar way to the previous example. , and the reference and thehandleClickmethod are returned insetup. In thehandleClickmethod, we can access the child component object throughmyChild.valueand call its methodsayHello.In Vue3, the use of the

function is very simple. You can not only reference elements, but also reference sub-components, and you can return the reference and sum in thesetupfunction. event handler. This makes it easier and more convenient to directly access elements and subcomponents in Vue components.

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