<el-cascader :options="categoryTree" :props="props" collapse-tags v-model="category" style="width:100%" @change="changeCategory"

              @visible-change="visibleChange">

            </el-cascader>

 visibleChange (val) {

      this.$nextTick(() => {

        const $el = document.querySelectorAll('.el-cascader-panel .el-cascader-node[aria-owns]');

        Array.from($el).map((item) => item.removeAttribute('aria-owns'));

      })

    },