vue.js props 验证

<template>
  <div>
    <p>Message: {{ message }}</p>
    <p>Count: {{ count }}</p>
  </div>
</template>

<script>
export default {
  props: {
    message: {
      type: String,
      required: true
    },
    count: {
      type: Number,
      default: 0
    }
  }
};
</script>

<!-- 父组件 -->
<template>
  <ChildComponent :message="someString" :count="someNumber" />
</template>

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

export default {
  components: {
    ChildComponent
  },
  data() {
    return {
      someString: 'Hello, Vue!',
      someNumber: 42
    };
  }
};
</script>

<!-- 父组件 -->
<template>
  <ChildComponent :message="someString" />
</template>

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

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