vue2 export default写法，computed、methods的使用

<template><div><h2>{{nameAll}}</h2><h2>{{method}}</h2><h2>{{tt()}}</h2><h2>{{firstName}}</h2><h2>更新后赋值数据：{{lastName}}</h2><h2>赋值数据:{{writeValue}}</h2><button @click="tt">vue2数据更新</button></div>
</template><script lang ='ts' name='VueTwo'>export default{data(){return {firstName:"wu",lastName:"liuqi"}},computed:{nameAll:function(){return this.firstName + this.lastName},method(){return 111},writeValue:{get:function(){//也可以写为get(){} 页面显示数据会调用这个方法return this.firstName + this.lastName},set:function(value){//也可以写为set(value){}  赋值数据会调用这个方法this.lastName = valuereturn value}}},methods:{tt(){this.writeValue = "alilailail"}}}
</script>
<style>
</style>

页面效果：在这里插入图片描述

下面是vue3 computed函数的代码示例：

<template><div class="ttt"><button @click="updateReactive2">更新数据</button><h2>{{fullName}}</h2><h2>{{name3}}</h2></div>
</template><script setup lang="ts" name="testName">import {ref} from 'vue'import {reactive} from 'vue'import {toRefs} from 'vue'import {toRef} from 'vue'import {computed} from 'vue'function updateReactive2(){fullName.value = "啦啦啦啦啦"}let name3 = ref('李莉莉')let fullName = computed({get(){return name3},set(value){console.log("赋值方法")name3.value = value}})
</script>
<style>.ttt{color:red}
</style>