slot	用于设置标签的属性值(slot=“title”)
slot-scope
v-slot

slot

 <el-menu-item v-if="!navMenu.children" :key="navMenu.id" :index="navMenu.id + ''" @click="itemClick(navMenu)" >
   <span slot="title">{{ navMenu.name }}</span>
</el-menu-item>

<span slot="footer" class="dialog-footer">
  <el-button @click="dialogVisible = false">取 消</el-button>
  <el-button type="primary" @click="save">确 定</el-button>
</span>

slot-scope

<el-table-column label="修改时间" width='150' align='center'>
  <template slot-scope="scope">{{scope.row.modifyTime|formtterDate}}</template>
</el-table-column>

v-slot

<Test>
  <template v-slot:header="scope">//v-slot定义作用域插槽
	   <div>
	     <p> {{scope.msg}} </p>
	   </div>
  </template>
</Test>