访问子组件数据vuejs

<!-- 父组件 -->
<template>
  <ChildComponent :childProp="parentData" />
</template>

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

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

<!-- 子组件 -->
<template>
  <div>{{ childProp }}</div>
</template>

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

<!-- 子组件 -->
<template>
  <button @click="notifyParent">Click me</button>
</template>

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

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

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

export default {
  components: {
    ChildComponent
  },
  methods: {
    handleChildEvent(data) {
      console.log(data); // 'Data from child'
    }
  }
};
</script>

<!-- 父组件 -->
<template>
  <ChildComponent ref="childRef" />
</template>

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

export default {
  components: {
    ChildComponent
  },
  mounted() {
    console.log(this.$refs.childRef); // 访问子组件实例
  }
};
</script>

// store.js
import { createStore } from 'vuex';

export default createStore({
  state: {
    sharedData: 'Shared data'
  },
  mutations: {
    updateSharedData(state, payload) {
      state.sharedData = payload;
    }
  },
  actions: {
    updateSharedData({ commit }, payload) {
      commit('updateSharedData', payload);
    }
  }
});

<!-- 组件 -->
<template>
  <div>{{ sharedData }}</div>
</template>

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

export default {
  computed: {
    ...mapState(['sharedData'])
  },
  methods: {
    ...mapActions(['updateSharedData'])
  }
};
</script>