Vue的v-for不显示模式窗口的正确文本(仅显示第一项的数据)

<template>
  <div>
    <button @click="openModal">打开模态窗口</button>
    <div v-if="showModal">
      <h2>模态窗口</h2>
      <ul>
        <li v-for="item in firstItemArray" :key="item.id">{{ item.name }}</li>
      </ul>
    </div>
  </div>
</template>

<script>
export default {
  data() {
    return {
      showModal: false,
      items: [
        { id: 1, name: 'Item 1' },
        { id: 2, name: 'Item 2' },
        { id: 3, name: 'Item 3' }
      ]
    };
  },
  computed: {
    firstItemArray() {
      return [this.items[0]];
    }
  },
  methods: {
    openModal() {
      this.showModal = true;
    }
  }
};
</script>