子组件中未呈现Vue.js属性

<template>
  <div>
    <child-component v-bind:message="message"></child-component>
  </div>
</template>

<script>
export default {
  data() {
    return {
      message: "Hello from parent component"
    };
  }
};
</script>

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

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

<script>
export default {
  props: {
    message: {
      type: String,
      default: "Default message"
    }
  }
};
</script>