vue向子组件传递插槽
参考https://www.jiangweishan.com/article/vue20201104a1.html```
<template v-for="(index, name) in $slots" v-slot:>
<slot :name="name" />
</template>
```
$scopedSlots属于降级代码，vue3已不存在
```
<template v-for="(index, name) in $scopedSlots" v-slot:="data">
<slot :name="name" v-bind="data"></slot>
</template>
```
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