vue3除了pinia/vuex的其他通讯方式还有那些

1. Props 和 Events
Props：父组件通过 props 向子组件传递数据。
Events：子组件通过 $emit 向父组件发送事件。

<!-- ParentComponent.vue -->
<template><ChildComponent :message="parentMessage" @update-message="updateMessage" />
</template><script setup lang="ts">
import { ref } from 'vue';
import ChildComponent from './ChildComponent.vue';const parentMessage = ref('Hello from parent');function updateMessage(newMessage: string) {parentMessage.value = newMessage;
}
</script><!-- ChildComponent.vue -->
<template><div><p>{{ message }}</p><button @click="sendMessage">Send Message</button></div>
</template><script setup lang="ts">
const props = defineProps<{message: string;
}>();const emit = defineEmits<{(e: 'update-message', message: string): void;
}>();function sendMessage() {emit('update-message', 'Hello from child');
}
</script>

2. Provide / Inject
Provide：祖先组件通过 provide 提供数据。
Inject：后代组件通过 inject 获取数据。

<!-- AncestorComponent.vue -->
<template><DescendantComponent />
</template><script setup lang="ts">
import { provide, ref } from 'vue';
import DescendantComponent from './DescendantComponent.vue';const message = ref('Hello from ancestor');
provide('message', message);
</script><!-- DescendantComponent.vue -->
<template><div><p>{{ injectedMessage }}</p></div>
</template><script setup lang="ts">
import { inject } from 'vue';const injectedMessage = inject('message');
</script>

3. Event Bus
使用一个全局的 Vue 实例作为事件总线，组件可以通过它来发布和订阅事件。

// eventBus.ts
import { createApp } from 'vue';export const eventBus = createApp({});// ComponentA.vue
<script setup lang="ts">
import { eventBus } from './eventBus';function sendMessage() {eventBus.config.globalProperties.$emit('message', 'Hello from Component A');
}
</script>// ComponentB.vue
<script setup lang="ts">
import { onMounted } from 'vue';
import { eventBus } from './eventBus';onMounted(() => {eventBus.config.globalProperties.$on('message', (message: string) => {console.log(message);});
});
</script>

4. Reactive State
使用 Vue 的 reactive 或 ref 创建一个全局状态对象，组件之间共享这个状态。

// sharedState.ts
import { reactive } from 'vue';export const state = reactive({message: 'Hello from shared state',
});// ComponentA.vue
<script setup lang="ts">
import { state } from './sharedState';function updateMessage() {state.message = 'Updated message from Component A';
}
</script>// ComponentB.vue
<template><div><p>{{ state.message }}</p></div>
</template><script setup lang="ts">
import { state } from './sharedState';
</script>

5. Composables
使用 Vue 3 的 Composition API 创建可重用的逻辑，组件之间共享状态和逻辑。

// useSharedState.ts
import { ref } from 'vue';export function useSharedState() {const message = ref('Hello from composable');function updateMessage(newMessage: string) {message.value = newMessage;}return { message, updateMessage };
}// ComponentA.vue
<script setup lang="ts">
import { useSharedState } from './useSharedState';const { message, updateMessage } = useSharedState();function changeMessage() {updateMessage('Updated message from Component A');
}
</script>// ComponentB.vue
<template><div><p>{{ message }}</p></div>
</template><script setup lang="ts">
import { useSharedState } from './useSharedState';const { message } = useSharedState();
</script>

6. Teleport
使用 Teleport 将组件渲染到 DOM 中的其他位置，适用于模态框、通知等场景。

<!-- ParentComponent.vue -->
<template><div><button @click="showModal = true">Show Modal</button><Teleport to="body"><ModalComponent v-if="showModal" @close="showModal = false" /></Teleport></div>
</template><script setup lang="ts">
import { ref } from 'vue';
import ModalComponent from './ModalComponent.vue';const showModal = ref(false);
</script><!-- ModalComponent.vue -->
<template><div class="modal"><p>This is a modal</p><button @click="$emit('close')">Close</button></div>
</template><script setup lang="ts">
defineEmits(['close']);
</script>

7. Custom Directives
使用自定义指令在组件之间传递数据或执行操作。

// v-my-directive.ts
import { DirectiveBinding } from 'vue';export const myDirective = {mounted(el: HTMLElement, binding: DirectiveBinding) {el.addEventListener('click', () => {console.log('Directive triggered with value:', binding.value);});},
};// ComponentA.vue
<template><button v-my-directive="'Hello from directive'">Click me</button>
</template><script setup lang="ts">
import { myDirective } from './v-my-directive';
</script>

8. Global Properties
使用 app.config.globalProperties 添加全局属性或方法，所有组件都可以访问。

// main.ts
import { createApp } from 'vue';
import App from './App.vue';const app = createApp(App);app.config.globalProperties.$myGlobalFunction = () => {console.log('Hello from global function');
};app.mount('#app');// ComponentA.vue
<script setup lang="ts">
import { getCurrentInstance } from 'vue';const instance = getCurrentInstance();
instance?.proxy?.$myGlobalFunction();
</script>

9. Custom Events with mitt
使用第三方库 mitt 来实现轻量级的事件总线。

npm install mitt
// eventBus.ts
import mitt from 'mitt';export const eventBus = mitt();// ComponentA.vue
<script setup lang="ts">
import { eventBus } from './eventBus';function sendMessage() {eventBus.emit('message', 'Hello from Component A');
}
</script>// ComponentB.vue
<script setup lang="ts">
import { onMounted } from 'vue';
import { eventBus } from './eventBus';onMounted(() => {eventBus.on('message', (message: string) => {console.log(message);});
});
</script>

10. Context API
使用 Vue 3 的 provide 和 inject 来实现类似 React Context 的功能。

// context.ts
import { provide, inject, ref } from 'vue';const MessageSymbol = Symbol();export function provideMessage() {const message = ref('Hello from context');provide(MessageSymbol, message);
}export function useMessage() {const message = inject(MessageSymbol);if (!message) {throw new Error('Message not provided');}return message;
}// ParentComponent.vue
<script setup lang="ts">
import { provideMessage } from './context';
import ChildComponent from './ChildComponent.vue';provideMessage();
</script><template><ChildComponent />
</template>// ChildComponent.vue
<script setup lang="ts">
import { useMessage } from './context';const message = useMessage();
</script><template><div><p>{{ message }}</p></div>
</template>