Vue3 生命周期函数

一、引入 ，写在setup里面

import {onBeforeMount, onMounted, onBeforeUpdate, onUpdated, onBeforeUnmount, onUnmounted} from 'vue';

二、与Vue2的关系

setup() ===> beforecreate 和 created

onbeforemount ===>  beforemounted

onmounted ===> mounted

onbeforeupdate ===>  beforeupdate

onupdated ===> updated

onbeforeunmount ===> beforedestory

onunmonuted ===> destoryed

onmounted(()=>{
xxxxx
})