Vue 2子进程和父进程双向同步

<template>
  <div>
    <child-component :message="message" @update="updateMessage"></child-component>
  </div>
</template>

<script>
import ChildComponent from './ChildComponent.vue';

export default {
  components: {
    ChildComponent
  },
  data() {
    return {
      message: 'Hello from parent'
    };
  },
  methods: {
    updateMessage(newMessage) {
      this.message = newMessage;
    }
  }
};
</script>

<template>
  <div>
    <p>{{ message }}</p>
    <button @click="sendMessage">Send Message to Parent</button>
  </div>
</template>

<script>
export default {
  props: ['message'],
  methods: {
    sendMessage() {
      this.$emit('update', 'Hello from child');
    }
  }
};
</script>

<template>
  <div>
    <child-component @send="receiveMessage"></child-component>
    <p>{{ message }}</p>
  </div>
</template>

<script>
import ChildComponent from './ChildComponent.vue';

export default {
  components: {
    ChildComponent
  },
  data() {
    return {
      message: ''
    };
  },
  methods: {
    receiveMessage(newMessage) {
      this.message = newMessage;
    }
  }
};
</script>

<template>
  <div>
    <button @click="sendMessage">Send Message to Parent</button>
  </div>
</template>

<script>
export default {
  methods: {
    sendMessage() {
      this.$emit('send', 'Hello from child');
    }
  }
};
</script>