请用vue3 写一个题库答题界面

<p>由于涉及到数据的获取和存储，需要与后端进行交互。以下是一个简单的题库答题界面的代码框架：</p>
<template>
  <div class="question-container">
    <div class="question-header">
      <h1>{{ currentQuestion.question }}</h1>
      <h2>第 {{ currentIndex + 1 }} 题，共 {{ totalQuestions }} 题</h2>
    </div>
    <div class="question-content">
      <ul>
        <li v-for="(option, index) in currentQuestion.options" :key="index">
          <label>
            <input type="radio" :name="`option-${currentIndex}`" :value="option" v-model="selectedOption">
            {{ option }}
          </label>
        </li>
      </ul>
    </div>
    <div class="question-footer">
      <button @click="submitAnswer">提交答案</button>
    </div>
  </div>
</template>
<script>
import { ref, reactive } from 'vue'

export default {
  name: 'Question',
  setup() {
    // 题目列表
    const questions = ref([])
    // 当前题目的索引
    const currentIndex = ref(0)
    // 当前题目
    const currentQuestion = ref({})
    // 总共的题目数
    const totalQuestions = ref(0)
    // 答案选项
    const selectedOption = ref('')
    // 答案列表
    const answers = reactive([])

    // 获取题目列表
    const fetchQuestions = async () => {
      const response = await fetch('/api/questions')
      const data = await response.json()
      questions.value = data.questions
      totalQuestions.value = data.totalQuestions
      currentQuestion.value = questions.value[currentIndex.value]
    }

    // 提交答案
    const submitAnswer = () => {
      answers[currentIndex.value] = selectedOption.value
      if (currentIndex.value < totalQuestions.value - 1) {
        currentIndex.value++
        currentQuestion.value = questions.value[currentIndex.value]
        selectedOption.value = ''
      } else {
        // 所有题目已经回答完毕，提交答案到后端进行处理
        submitAnswersToBackend()
      }
    }

    // 提交答案到后端进行处理
    const submitAnswersToBackend = async () => {
      const response = await fetch('/api/answers', {
        method: 'POST',
        headers: {
          'Content-Type': 'application/json'
        },
        body: JSON.stringify({ answers })
      })
      const result = await response.json()
      console.log(result)
    }

    fetchQuestions()

    return {
      currentIndex,
      currentQuestion,
      totalQuestions,
      selectedOption,
      submitAnswer
    }
  }
}
</script