Vue.js特性Scoped Slots的浅析

//button.vue
<template>
 <button class="btn">
  <slot></slot> //相当于是占位
 </button>
</template>

<script>
export default {

}
</script>

//app.vue
<template>
 <div id="app">
 <Button>Buton with text</Button>
 <Button>
 <i class="fa fa-copy"></i>//这里取代了slot的位置
 </Button>

 <Button>
 <i class="fa fa-user"></i>Profile
 </Button>

 </div>
</template>

<script>
 import Button from './ponents/Button.vue'
 export default {
 name: 'app',
 ponents: {
 Button
 }
 }
</script>

//list.vue
<template>
 <div>
 <slot v-for="item in items"
   :item="item">//这里是slot的占位
 </slot> 
 </div>
</template>

//app.vue
<template>
 <div id="app">
 <List :items="listItems">
  <div slot-scope="row"
  class="list-item1">//这里可以获取到item，item原本是属于List组件内部的。也就是说slot获取了父组件的上下文。
  {{row.item.text}}
 </div>
 </List>
 </div>
</template>

//table.vue
<template>
 <table class="table">
 <thead>
  <slot name="columns">//这里定义了一个slot，名字叫columns，也就是说这里的内容是可以被替换掉的
  <th v-for="column in columns">
   {{column}}
  </th>
  </slot>
 </thead>
 <tbody>
 <tr v-for="item in data">
  <slot :row="item">//这里slot有一个prop是row
  <td v-for="column in columns"
   v-if="hasValue(item, column)">
   {{itemValue(item, column)}}
  </td>
  </slot>
 </tr>
 </tbody>
 </table>
</template>

//app.vue
<template>
 <div id="app">
 <CustomTable :data="tableData" 
   :columns="tableColumns">
 </CustomTable>

  <div class="table-separator"></div>

 <CustomTable :data="tableData">
  <template slot="columns">//这里有一个slot="columns"，意思是替换table.vue里面名字叫columns的slot
  <th>Title</th>
  <th>
  <i class="fa fa-images"></i> Image
  </th>
  <th class="actions-row">
  <i class="fab fa-vuejs vue-icon"></i> Actions
  </th>
 </template>

 <template slot-scope="{row}">//这里替换table.vue里面slot为row的内部内容
 <td class="bold-row">
  {{row.title}}
 </td>
 <td class="img-row">
  <img :src="row.img">
 </td>
 <td class="actions-row">
  <Button @click.native="handleAction('Edit')">
  <i class="fa fa-edit"></i>
  </Button>
  <Button @click.native="handleAction('Delete')" type="danger">
  <i class="fa fa-trash"></i>
  </Button>
 </td>
 </template> 
 </CustomTable>
 </div>
</template>