效果：

 

        <a-form-item label="Cron表达式" name="cron" required>
          <a-input v-show="false" v-model:value="setForm.cron"></a-input>
          <a-button type="primary" size="small" @click="handleCronconfig"> 配置 </a-button>
        </a-form-item>

  function  handleCronconfig () {
        modalvisible.value=true
    }

    <a-modal v-model:visible="modalvisible" title="Cron表达式" @cancel="handlecancel" :destroyOnClose="true" @ok="handleOk">
       <vue3-cron v-model="expression" locale="cn"/>
    </a-modal>

import Vue3Cron from 'vue3-cron-antd';

 function   handleOk () {
       modalvisible.value = false
      getval(expression.value)
      formref.value.validateFields('cron')
    }
 function   handlecancel () {
          modalvisible.value = false
    }
  function  getval (param) {
     setForm.value.cron = param
    }

   const expression=ref('* * * * * ?')