作业：作业上传

3.22作业/Vue3Proj/vue-project/src/Com3_3.vue

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+<template>
+<h3 v-if="flag">条件为{{flag}}时，渲染‘这是v-if’</h3>
+      <h3 v-show="flag">条件为{{flag}}时，渲染h3-这是v-show</h3>
+      <div v-show="flag" class="div1">div</div>
+      <button type="button" @click="change">切换元素-{{flag}}</button>
+</template>
+
+<script setup lang="ts">
+import {ref  } from "vue";
+
+const flag = ref(true)
+const change = ()=>{
+    flag.value = !flag.value
+}
+</script>