Vue2 js将一些值从一个路径的输入传递到另一个路径，或者将数据属性从一个路径传递到另一个路径

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

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

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

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

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

// 子组件
<template>
  <div>
    <button @click="sendData">Send Data</button>
  </div>
</template>

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

// 父组件
<template>
  <div>
    <child-component @custom-event="handleData"></child-component>
  </div>
</template>

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

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