利用Vue3实现一个可以用js调用的组件

Confirm({
  title: '',
  message: ''
}).then(() => {
  // 点击确认
}).catch(() => {
  // 点击取消
})

// src/components/Confirm/Confirm.vue
<script>
export default {
  name: 'Confirm',
  props: {
    title: {
      type: String,
      default: '提示'
    },
    message: {
      type: String,
      default: '默认提示信息'
    },
    confirmBtnText: {
      type: String,
      default: '确认'
    },
    cancelBtnText: {
      type: String,
      default: '取消'
    },
    onConfirm: {
      type: Function,
      default: () => {}
    },
    onCancel: {
      type: Function,
      default: () => {}
    }
  }
}
</script>

// src/components/Confirm/index.js
import { createApp } from 'vue'
import Confirm from './Confirm'
function confirm ({ title, message, confirmBtnText, cancelBtnText }) {
  return new Promise((resolve, reject) => {
    // 实例化组件，createApp第二个参数是props
    const confirmInstance = createApp(Confirm, {
      title: title || '提示',
      message: message || '确认消息',
      confirmBtnText: confirmBtnText || '确定',
      cancelBtnText: cancelBtnText || '取消',
      onConfirm: () => {
        unmount()
        resolve()
      },
      onCancel: () => {
        unmount()
        reject(new Error())
      }
    })
    // 卸载组件
    const unmount = () => {
      confirmInstance.unmount()
      document.body.removeChild(parentnode)
    }
    // 创建一个挂载容器
    const parentNode = document.createElement('div')
    document.body.appendChild(parentNode)
    // 挂载组件
    confirmInstance.mount(parentNode)
  })
}

export default confirm

setup () {
  const showConfirm = () => {
    Confirm({
      title: '标题',
      message: '内容'
    }).then(() => {
      console.log('点击确认')
    }).catch(() => {
      console.log('点击取消')
    })
  }
  return {
    showConfirm
  }
}