VUE中的秋天屬性是什麼

Vue.js中的透傳屬性是指從父組件傳遞到子組件但未顯式聲明為props的屬性，它們會自動應用到子組件的根元素上。 1. 默認情況下，Vue 3會將未聲明的class、style、id、事件監聽器等屬性透傳至子組件的根元素；2. 若子組件模板有多個根節點，需設置inheritAttrs: false並使用v-bind="$attrs"手動控制屬性綁定位置；3. $attrs包含所有未被props或emits聲明的屬性，可用於靈活分發透傳屬性；4. 此機制使封裝組件更接近原生HTML行為，提升復用性與直觀性。

In Vue.js, fallthrough attributes refer to attributes (like class , style , id , or event listeners such as @click ) that are passed down from a parent component to a child component without being explicitly declared as props.

When you use a component in Vue, any attributes you apply to it that aren't recognized as props will automatically be added to the child component's root element —this is the default behavior in Vue 3. This is what we mean by "fallthrough" attributes.

How Fallthrough Attributes Work

Suppose you have a simple button wrapper component:

 <!-- MyButton.vue -->
<template>
  <button class="btn" @click="onClick">
    <slot />
  </button>
</template>

<script setup>
defineProps([&#39;onClick&#39;])
</script>

Now, when you use this component and pass extra attributes:

 <MyButton class="primary" @click="handleClick">Submit</MyButton>

Even though class and @click aren't declared as props (except @click is bound to the prop onClick ), Vue will automatically "fall through" the class and any other undeclared attributes to the root <button> element in MyButton .

So the final rendered button will have:

• The base class btn
• The inherited class primary
• Both the internal click handler and the one passed via onClick

This makes wrapper components very convenient—you don't have to manually forward every HTML attribute.

Key Points About Fallthrough Attributes

• They apply to the root element of the child component. If your template has multiple root elements (a fragment), Vue cannot automatically decide where to attach them, and you'll need to manually specify using $attrs or the inheritAttrs option.

• Common fallthrough attributes include:

  • class
  • style
  • id
  • Inline event listeners ( @click , @input , etc.)
  • Arbitrary attributes like data-* , aria-* , etc.

• They can be controlled using $attrs and the inheritAttrs option.

Controlling Fallthrough Behavior

Sometimes you don't want attributes to fall through automatically. For example, if your component has multiple root nodes or you want to apply attributes to a specific internal element.

You can explicitly control this:

 <!-- CustomInput.vue -->
<template>
  <div class="wrapper">
    <input v-bind="$attrs" />
  </div>
</template>

<script setup>
// Disable automatic attribute inheritance
defineOptions({ inheritAttrs: false })
</script>

Now, any attributes passed to <custominput></custominput> won't go to the root <div> automatically. Instead, you place them where needed using <code>v-bind="$attrs" .

$attrs includes all attributes not declared as props or emits.

Summary

• Fallthrough attributes are HTML attributes passed to a component that are automatically applied to its root element.
• This behavior simplifies creating wrapper components.
• In Vue 3, it works out of the box unless inheritAttrs: false is set.
• Use $attrs to manually control where attributes are applied, especially in multi-root or complex components.

Basically, fallthrough attributes make Vue components feel more like native HTML elements—they just work the way you'd expect when adding classes or event listeners.