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创建   挂载  更新 销毁 四个阶段  = > 生命周期函数　生命周期钩子　　created  mounted

创建vue2 的脚手架：　vue create vue2_test

v-show="isShow"

v-if = "isShow"

这里的isShow 表示一个函数

let isShow = "true"

<template><div class="person"><h2>当前求和为：{{ sum }}</h2><button @click="changeSum">点我sum+1</button></div>
</template><!-- vue3写法 -->
<script lang="ts" setup name="Person">import { ref, onBeforeMount, onMounted, onBeforeUpdate, onUpdated, onBeforeUnmount, onUnmounted } from 'vue'// 数据let sum = ref(0)// 方法function changeSum() {sum.value += 1}console.log('setup')// 生命周期钩子onBeforeMount(()=>{console.log('挂载之前')})onMounted(()=>{console.log('挂载完毕')})onBeforeUpdate(()=>{console.log('更新之前')})onUpdated(()=>{console.log('更新完毕')})onBeforeUnmount(()=>{console.log('卸载之前')})onUnmounted(()=>{console.log('卸载完毕')})
</script>