Vue 컴포넌트 통신을 위한 프로그래밍 팁 및 주의사항

// 父组件
<template>
  <div>
    <child-component :message="message" />
  </div>
</template>

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

export default {
  components: {
    ChildComponent
  },
  data() {
    return {
      message: 'Hello Vue!'
    }
  }
}
</script>

// 子组件
<template>
  <div>
    <p>{{ message }}</p>
  </div>
</template>

<script>
export default {
  props: ['message']
}
</script>

// 子组件
<template>
  <button @click="handleClick">点击我触发事件</button>
</template>

<script>
export default {
  methods: {
    handleClick() {
      this.$emit('my-event', 'Hello Parent!')
    }
  }
}
</script>

// 父组件
<template>
  <div>
    <child-component @my-event="handleEvent" />
  </div>
</template>

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

export default {
  components: {
    ChildComponent
  },
  methods: {
    handleEvent(message) {
      console.log(message)
    }
  }
}
</script>

// EventBus.js
import Vue from 'vue';
export const EventBus = new Vue();

// 子组件A
<template>
  <button @click="handleClick">点击我触发事件</button>
</template>

<script>
import { EventBus } from './EventBus.js';

export default {
  methods: {
    handleClick() {
      EventBus.$emit('my-event', 'Hello!')
    }
  }
}
</script>

// 子组件B
<template>
  <div>
    <p>{{ message }}</p>
  </div>
</template>

<script>
import { EventBus } from './EventBus.js';

export default {
  data() {
    return {
      message: ''
    }
  },
  mounted() {
    EventBus.$on('my-event', (message) => { 
      this.message = message;
    })
  }
}
</script>

// store.js
import Vue from 'vue';
import Vuex from 'vuex';

Vue.use(Vuex);

export default new Vuex.Store({
  state: {
    message: ''
  },
  mutations: {
    setMessage(state, message) {
      state.message = message;
    }
  },
  actions: {
    updateMessage({ commit }, message) {
      commit('setMessage', message);
    }
  },
  getters: {
    getMessage(state) {
      return state.message;
    }
  }
});

// 子组件A
<template>
  <button @click="handleClick">点击我触发事件</button>
</template>

<script>
import { mapActions } from 'vuex';

export default {
  methods: {
    ...mapActions(['updateMessage']),
    handleClick() {
      this.updateMessage('Hello Vuex!');
    }
  }
}
</script>

// 子组件B
<template>
  <div>
    <p>{{ message }}</p>
  </div>
</template>

<script>
import { mapGetters } from 'vuex';

export default {
  computed: {
    ...mapGetters(['getMessage']),
    message() {
      return this.getMessage;
    }
  }
}
</script>