在VUE JS中传递值

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

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

export default {
  components: {
    ChildComponent
  },
  data() {
    return {
      parentMessage: 'Hello from parent component'
    };
  }
};
</script>

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

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

<!-- 父组件 -->
<template>
  <div>
    <child-component @child-event="handleChildEvent"></child-component>
  </div>
</template>

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

export default {
  components: {
    ChildComponent
  },
  methods: {
    handleChildEvent(data) {
      console.log(data); // 处理子组件传递的数据
    }
  }
};
</script>

<!-- 子组件 -->
<template>
  <div>
    <button @click="emitEvent">传递数据给父组件</button>
  </div>
</template>

<script>
export default {
  methods: {
    emitEvent() {
      this.$emit('child-event', 'Hello from child component');
    }
  }
};
</script>

<!-- 父组件 -->
<template>
  <div>
    <p>{{ message }}</p>
    <button @click="updateMessage">更新消息</button>
  </div>
</template>

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

export default {
  computed: {
    ...mapGetters(['getMessage'])
  },
  methods: {
    ...mapActions(['updateMessage'])
  }
};
</script>

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

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

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

<!-- Vuex状态管理 -->
<script>
export default {
  state: {
    message: 'Hello from Vuex'
  },
  getters: {
    getMessage: state => state.message
  },
  mutations: {
    setMessage(state, payload) {
      state.message = payload;
    }
  },
  actions: {
    updateMessage({ commit }) {
      commit('setMessage', 'Updated message from Vuex');
    }
  }
};
</script>