Detailed explanation of Vue3 encapsulation Message message prompt instance function

<template>
  <Transition name="down">
    <div class="my-message" :style="style[type]" v-show='isShow'>
      <!-- The style is bound above -->
      <!-- Different prompt icons will change-->
      <i class="iconfont" :class="[style[type].icon]"></i>
      <span class="text">{{text}}</span>
    </div>
  </Transition>
</template>
<script>
import { onMounted, ref } from 'vue'
export default {
  name: 'myMessage',
  props: {
    text: {
      type: String,
      default: ''
    },
    type: {
      type: String,
      // warn warning error error success success default: 'warn'
    }
  },
  setup () {
    // Define an object containing three styles. The object key is the type string const style = {
      warn:
        icon: 'icon-warning',
        color: '#E6A23C',
        backgroundColor: 'rgb(253, 246, 236)',
        borderColor: 'rgb(250, 236, 216)'
      },
      error: {
        icon: 'icon-shanchu',
        color: '#F56C6C',
        backgroundColor: 'rgb(254, 240, 240)',
        borderColor: 'rgb(253, 226, 226)'
      },
      success: {
        icon: 'icon-queren2',
        color: '#67C23A',
        backgroundColor: 'rgb(240, 249, 235)',
        borderColor: 'rgb(225, 243, 216)'
      }
    }
    // Control animation const isShow = ref(false)
    // Trigger onMounted(() => {
      isShow.value = true
    })
    return { style, isShow }
  }
}
</script>
<style scoped lang="less">
.down {
  &-enter {
    &-from {
      transform: translate3d(0, -75px, 0);
      opacity: 0;
    }
    &-active {
      transition: all 0.5s;
    }
    &-to {
      transform: none;
      opacity: 1;
    }
  }
}
.my-message {
  width: 300px;
  height: 50px;
  position: fixed;
  z-index: 9999;
  left: 50%;
  margin-left: -150px;
  top: 25px;
  line-height: 50px;
  padding: 0 25px;
  border: 1px solid #e4e4e4;
  background: #f5f5f5;
  color: #999;
  border-radius: 4px;
  i {
    margin-right: 4px;
    vertical-align: middle;
  }
  .text {
    vertical-align: middle;
  }
}
</style>

//icon//textimport { createVNode,render } from 'vue'
import myMessage from './message.vue'
// Dynamically create a DOM container const div = document.createElement('div')
div.setAttribute('class','my-message-container')
document.body.appendChild(div)
export default ({text,type})=>{
  let timer = null
  //createVNode is used to create a virtual node // Parameter 1 supports the component // Parameter 2 represents the options passed to the component const vnode = createVNode(myMessage,{text, type})
// Render the virtual node into the DOM of the page // Parameters of the render function // Parameter 1: indicates the content to be rendered (virtual node)
// Parameter 2: indicates the target location of rendering (DOM element)
   render(vnode,div)
 // Hope it disappears after 1s clearTimeout(timer)
   timer = setTimeout(()=>{
     // Clear the contents of div render(null,div)
   },1000)
}
// $message({ text: 'Login failed', type: 'error'})

import Message from './Message.js'
export default {
  install(app){
  // If you want to mount global properties, you can call the property this.$message through the component instance
     // Extend an instance method app.config.globalProperties.$message = Message // prototype function }
}

import Message from './message.js'
setup(){
  Message({ text: 'Login failed', type: 'error' })
}

// Access the component instance object in the setup function import { getCurrentInstance } from 'vue'
   setup(){
     const instance = getCurrentInstance()
     instance.proxy.$message({ text: 'Login failed', type: 'error' })
   } 

this.$message({ text: 'Login failed', type: 'error' })