关于vue3:elementui-plus怎么在级联选中后关闭弹层

<el-cascader  v-model="form.productCategoryId"  @change="classifyChange"  :options="classify"  :props="{     checkStrictly: true,     value: 'categoryId',     label: 'categoryName',     expandTrigger: 'hover',    emitPath: false,  }"  clearable  :show-all-levels='false'  ref='classifyRef'></el-cascader>

定义一个ref
const classifyRef = ref()

setup外面

const classifyChange = () => {  console.log(classifyRef.value)  // 调用实例的办法手动敞开  classifyRef.value.togglePopperVisible()}