## 插槽
1. 作用:让父组件可以向子组件指定位置插入html结构,也是一种组件间通信的方式,适用于 <strong style="color:red">父组件 ===> 子组件</strong> 。
2. 分类:默认插槽、具名插槽、作用域插槽
3. 使用方式:
1. 默认插槽:
```vue
父组件中:
<Category>
<div>html结构1</div>
</Category>
子组件中:
<template>
<div>
<!-- 定义插槽 -->
<slot>插槽默认内容...</slot>
</div>
</template>
```
2. 具名插槽:
```vue
父组件中:
<Category>
<templateslot="center">
<div>html结构1</div>
</template>
<templatev-slot:footer>
<div>html结构2</div>
</template>
</Category>
子组件中:
<template>
<div>
<!-- 定义插槽 -->
<slot name="center">插槽默认内容...</slot>
<slot name="footer">插槽默认内容...</slot>
</div>
</template>
```
3. 作用域插槽:
1. 理解:<span style="color:red">数据在组件的自身,但根据数据生成的结构需要组件的使用者来决定。</span>(games数据在Category组件中,但使用数据所遍历出来的结构由App组件决定)
2. 具体编码:
```vue
父组件中:
<Category>
<templatescope="scopeData">
<!-- 生成的是ul列表 -->
<ul>
<li v-for="g in scopeData.games":key="g">{{g}}</li>
</ul>
</template>
</Category>
<Category>
<templateslot-scope="scopeData">
<!-- 生成的是h4标题 -->
<h4v-for="g in scopeData.games" :key="g">{{g}}</h4>
</template>
</Category>
子组件中:
<template>
<div>
<slot :games="games"></slot>
</div>
</template>
<script>
exportdefault {
name:'Category',
props:['title'],
//数据在子组件自身
data() {
return {
games:['红色警戒','穿越火线','劲舞团','超级玛丽']
}
},
}
</script>
```
```
```
默认插槽
Category.vue:
<template>
<div class="category">
<h3>{{ title }}分类</h3>
<!-- <ul>
<li v-for="(item,index) in listData" :key="index">{{ item }}</li>
</ul> -->
<!--slot:定义一个插槽-->
<!--组件标签的插槽放在这里-->
<slot>我是一些默认值,当使用者没有传递具体结构时,我会出现</slot>
</div>
</template>
<script>
export default {
name:'C-category',
props:['title']
}
</script>
<style>
.category{
background-color: pink;
width: 200px;
height: 300px;
}
h3{
text-align: center;
background-color: yellow;
}
image{
width: 100%;
height: auto;
}
</style>
App.vue:
<template>
<div class="container">
<category title="美食" >
<img src="https://img1.baidu.com/it/u=3282457405,235959913&fm=253&fmt=auto&app=138&f=JPEG?w=750&h=500" alt="">
</category>
<category title="游戏" :listData="games">
<ul>
<li v-for="(item,index) in games" :key="index">{{ item }}</li>
</ul>
</category>
<category title="电影" :listData="films">
<!--control:表示是否可以播放-->
<video controls src="http://clips.vorwaerts-gmbh.de/big_buck_bunny.mp4"></video>
</category>
</div>
</template>
<script>
import category from './components/Category.vue'
export default {
name:'App',
components:{category},
data(){
return{
foods:['火锅','烧烤','小龙虾','牛排'],
games:['红色警戒','穿越火线','劲舞团','超级玛丽'],
films:['《教父》','《拆弹专家》','《你好,李焕英》','《尚硅谷》']
}
}
}
</script>
<style scoped>
.container{
display: flex;
justify-content: space-around;
}
img{
width: 100%;
}
video{
width: 100%;
}

具名插槽
Category.vue:
<template>
<div class="category">
<h3>{{ title }}分类</h3>
<!-- <ul>
<li v-for="(item,index) in listData" :key="index">{{ item }}</li>
</ul> -->
<!--slot:定义一个插槽-->
<!--组件标签的插槽放在这里-->
<slot name="center"></slot>
<slot name="footer"></slot>
</div>
</template>
<script>
export default {
name:'C-category',
props:['title']
}
</script>
<style>
.category{
background-color: pink;
width: 200px;
height: 300px;
}
h3{
text-align: center;
background-color: yellow;
}
image{
width: 100%;
height: auto;
}
</style>
Category.vue:
<template>
<div class="category">
<h3>{{ title }}分类</h3>
<!-- <ul>
<li v-for="(item,index) in listData" :key="index">{{ item }}</li>
</ul> -->
<!--slot:定义一个插槽-->
<!--组件标签的插槽放在这里-->
<slot name="center"></slot>
<slot name="footer"></slot>
</div>
</template>
<script>
export default {
name:'C-category',
props:['title']
}
</script>
<style>
.category{
background-color: pink;
width: 200px;
height: 300px;
}
h3{
text-align: center;
background-color: yellow;
}
image{
width: 100%;
height: auto;
}
</style>

作用域插槽
Category.vue:
<template>
<div class="category">
<h3>{{title}}分类</h3>
<!--通过slot传递参数games数组-->
<slot :games="games" msg="hello">我是默认的一些内容</slot>
</div>
</template>
<script>
export default {
name:'Category',
props:['title'],
data() {
return {
games:['红色警戒','穿越火线','劲舞团','超级玛丽'],
}
},
}
</script>
<style scoped>
.category{
background-color: pink;
width: 200px;
height: 300px;
}
h3{
text-align: center;
background-color: yellow;
}
video{
width: 100%;
}
img{
width: 100%;
}
</style>
App.vue:
<template>
<div class="container">
<Category title="游戏">
<!--这里的scope=“”可以随意写名字-->
<template scope="Gui">
<ul>
<li v-for="(g,index) in Gui.games" :key="index">{{g}}</li>
</ul>
</template>
</Category>
<Category title="游戏">
<template scope="{games}">
<ol>
<li style="color:red" v-for="(g,index) in games" :key="index">{{g}}</li>
</ol>
</template>
</Category>
<Category title="游戏">
<template slot-scope="{games}">
<h4 v-for="(g,index) in games" :key="index">{{g}}</h4>
</template>
</Category>
</div>
</template>
<script>
import Category from './components/Category'
export default {
name:'App',
components:{Category},
}
</script>
<style scoped>
.container,.foot{
display: flex;
justify-content: space-around;
}
h4{
text-align: center;
}
</style>