de-net/src/view/test.vue

<template>
  <div class="main_app">
    <el-button type="text" @click="dialogVisible = true"
    >click to open the Dialog</el-button
    >

    <el-dialog
      v-model="dialogVisible"
      title="Tips"
      width="30%"
      :before-close="handleClose"
    >
      <span>This is a message</span>
      <template #footer>
      <span class="dialog-footer">
        <el-button @click="dialogVisible = false">Cancel</el-button>
        <el-button type="primary" @click="dialogVisible = false"
        >Confirm</el-button
        >
      </span>
      </template>
    </el-dialog>
  </div>
</template>

<script setup>
  import { ref } from 'vue'
  import { ElMessageBox } from 'element-plus'

  const dialogVisible = ref(false)

  const handleClose = ( done => {
    ElMessageBox.confirm('Are you sure to close this dialog?')
      .then(() => {
        done()
      })
      .catch(() => {
        // catch error
      })
  });
</script>

<style>
.main_app {
  font-family: 'Avenir', Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-align: center;
  color: #2c3e50;
  margin-top: 60px;
}
</style>