z_element_plus/docs/examples/dialog/basic-usage.vue

<template>
  <el-button 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>
</template>

<script lang="ts" setup>
import { ref } from 'vue'
import { ElMessageBox } from 'element-plus'

const dialogVisible = ref(false)

const handleClose = (done: () => void) => {
  ElMessageBox.confirm('Are you sure to close this dialog?')
    .then(() => {
      done()
    })
    .catch(() => {
      // catch error
    })
}
</script>
<style scoped>
.dialog-footer button:first-child {
  margin-right: 10px;
}
</style>