Vue组件/数据未呈现

export default {
  data() {
    return {
      message: 'Hello Vue!'
    };
  }
};

<template>
  <div>{{ message }}</div> <!-- 确保这里的message是正确的变量名 -->
</template>

// 全局注册
Vue.component('my-component', MyComponent);

// 局部注册
export default {
  components: {
    MyComponent
  }
};

export default {
  data() {
    return {
      items: []
    };
  },
  created() {
    fetch('url-to-fetch-data')
      .then(response => response.json())
      .then(data => {
        this.items = data;
      });
  }
};

const app = new Vue({
  el: '#app',
  render: h => h(App)
});

this.$set(this.someObject, 'newProperty', 'newValue');

<template>
  <div>
    <h1>{{ title }}</h1>
    <ul>
      <li v-for="item in items" :key="item.id">{{ item.name }}</li>
    </ul>
  </div>
</template>

<script>
export default {
  data() {
    return {
      title: 'My List',
      items: []
    };
  },
  mounted() {
    // 假设这是一个异步获取数据的例子
    setTimeout(() => {
      this.items = [
        { id: 1, name: 'Item 1' },
        { id: 2, name: 'Item 2' }
      ];
    }, 1000);
  }
};
</script>