elementplus级联搜索--前端

  <el-cascader 
                             :options="dataTree"
                             v-model="treeVal"
                             :props="{
                               checkStrictly: false,
                               multiple: false,
                               label:'label',
                               value:'value'
                             }"
                             :filterable="true"
                             :filter-method="filterMethodToElCascader"
                             clearable
                             collapse-tags
                             :show-all-levels="false"
                             collapse-tags-tooltip/>

 //级联搜索
      filterMethodToElCascader(option:any, value:any){
        let aa = option.label? option.label.toLowerCase().includes(value.toLowerCase()) : '';
        return aa;
      }