<el-cascader

        :options="signList"

        v-model="signListId"

        filterable

        clearable

        :show-all-levels="false"

        :props="{ multiple: true, emitPath: false, value: 'id', label: 'name' }"

      >

      </el-cascader>

主要是用这两个属性 :show-all-levels="false" 和 emitPath: false,