4cd4fd28
 郭伟龙
feat: 初始化项目
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# Hover
> `v-b-hover` is a lightweight directive that allows you to react when an element either becomes
> hovered or unhovered.
## Overview
The `v-b-hover` directive can be used as an alternative to using custom CSS to handle hover states.
- `v-b-hover` will call your callback method with a boolean value indicating if the element is
hovered or not.
- The directive can be placed on almost any element or component.
- Internally, BootstrapVue uses this directive in several components.
## Directive syntax and usage
```html
<div v-b-hover="callback">content</div>
```
Where callback is required:
- A function reference that will be called whenever hover state changes. The callback is passed a
single boolean argument. `true` indicates that the element (or component) is hovered by the users
pointing device, or `false` if the element is not hovered.
The directive has no modifiers.
### Usage example
```html
<template>
<div v-b-hover="hoverHandler"> ... </div>
</template>
<script>
export default {
methods: {
hoverHandler(isHovered) {
if (isHovered) {
// Do something
} else {
// Do something else
}
}
}
}
</script>
```
## Live example
In the following, we are swapping icons and text color depending on the hover state of the element:
```html
<template>
<div>
<div v-b-hover="handleHover" class="border rounded py-3 px-4">
<b-icon v-if="isHovered" icon="battery-full" scale="2"></b-icon>
<b-icon v-else icon="battery" scale="2"></b-icon>
<span class="ml-2" :class="isHovered ? 'text-danger' : ''">Hover this area</span>
</div>
</div>
</template>
<script>
export default {
data() {
return {
isHovered: false
}
},
methods: {
handleHover(hovered) {
this.isHovered = hovered
}
}
}
</script>
<!-- b-v-hover-example.vue -->
```
## Accessibility concerns
Hover state should not be used to convey special meaning, as screen reader users and keyboard only
users typically can not trigger hover state on elements.
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