What does refs in vue mean?

Vue.js's refs allow components or elements to be obtained through unique identifiers; refs are accessed in the component through this.$refs object for DOM operations or component management, but are only available after the component is mounted and Pay attention to performance issues when using it.

refs in Vue.js

In Vue.js, refs is A reference to a component or element. It allows you to access DOM elements or component instances in order to perform operations or manage state.

refs work by assigning a unique identifier to a component or element, which can then be accessed via this identifier in code.

Using refs

To use refs on a component or element, you need to use the ref attribute:

<template>
  <div ref="myRef">这是一个 div</div>
</template>

In the above example , ref="myRef" will assign a unique identifier named myRef to the div element.

Accessing refs in a component

In a component instance, you can access refs through the this.$refs object:

export default {
  mounted() {
    console.log(this.$refs.myRef); // 访问 div 元素
  }
}

In the above example, this.$refs.myRef will return the DOM node of the div element with the ref="myRef" attribute.

Used for DOM operations

refs are often used for DOM operations. For example, you can use refs to:

• Get the dimensions or position of an element
• Add or remove event listeners
• Change the style of an element
• Access native DOM elements

For component management

refs can also be used for component management. For example, you can use refs to:

• Store child component instances as variables
• Call child component methods in parent components
• Access component DOM elements

Note

• refs are only available after the component is mounted.
• If you change the structure of a component or element, make sure to update refs.
• Avoid misuse of refs as it can cause performance issues.

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