vue3使用is动态切换组件，activeComponent用ref定义报错
Vue received a Component which was made a reactive object. This can lead to unnecessary performance overhead, and should be avoided by marking the component with markRaw or using shallowRef instead of ref

我们需要使用 shallowRef 替代 ref 来避免报错。shallowRef 创建的引用不会将组件标记为响应式对象，从而避免了潜在的性能开销。

<button @click="switchComponent('componentA')">Component A</button>
<button @click="switchComponent('componentB')">Component B</button>
<component :is="currentComponent"></component>
 
 
<script setup name="swtichComponent">
import { computed, ref, markRaw } from 'vue'
import ComponentA from './ComponentA.vue';
import ComponentB from './ComponentB.vue';
 
 
const currentComponent = ref(markRaw(ComponentA));
 
function switchComponent(component) {
  if (component === 'componentA') {
    currentComponent.value = markRaw(ComponentA);
  } else if (component === 'componentB') {
    currentComponent.value = markRaw(ComponentB);
  }
}
 
</script>

父子组件通信

父：
<component :is="activeComponent" @handleChange="handleChange" />
 
function handleClose() {
  window.close()
}
 
子：
const emits = defineEmits(['handleChange'])
const handleChange= () => {
  emits('handleChange')
}