渲染问题

component动态组件写法与vue2写法一致，代码如下：

<component :is="componentName"/>

<script setup>
	import { ref } from 'vue'
	import account from './user/account.vue'
	// 组件名称
	const componentName = ref('account')
	// 点击左侧菜单
	const onChangeTab = (name) => {
		componentName.value = name
	}
</script>

解决方法

由于使用setup语法糖时，动态组件失效，所以需要使用shallowReactive()转换下

<component :is="dom[componentName]"/>

	import { ref, shallowReactive } from 'vue'
	import account from './user/account.vue'
	import password from './user/password.vue'
	const dom = shallowReactive({
		account,
		password
	})
	// 组件名称
	const componentName = ref('account')
	// 点击左侧菜单
	const onChangeTab = (name) => {
		componentName.value = name
	}

最终效果

参考文章：https://www.jianshu.com/p/6403f8792b34