Cascader 級聯選擇器hover選擇效果

官網例子

<div class="block">
  <span class="demonstration">hover 觸發子菜單</span>
  <el-cascader
    v-model="value"
    :options="options"
    :props="{ expandTrigger: 'hover' }"   這樣是不生效的
    @change="handleChange"></el-cascader>
</div>

應該寫成下面這樣

<div class="block">
  <span class="demonstration">hover 觸發子菜單</span>
  <el-cascader
    expand-trigger="hover"
    :options="options"
    v-model="selectedOptions2"
    @change="handleChange">
  </el-cascader>
</div