如何在vuejs中验证b格式单选按钮组中的单选按钮

data() {
  return {
    selectedOption: ''
  }
}

<template>
  <div>
    <input type="radio" id="option1" value="option1" v-model="selectedOption">
    <label for="option1">Option 1</label>
    
    <input type="radio" id="option2" value="option2" v-model="selectedOption">
    <label for="option2">Option 2</label>
    
    <input type="radio" id="option3" value="option3" v-model="selectedOption">
    <label for="option3">Option 3</label>
  </div>
</template>

computed: {
  isOptionSelected() {
    return this.selectedOption !== '';
  }
}

<template>
  <div>
    <!-- 单选按钮组 -->
    
    <p v-if="!isOptionSelected">请选择一个选项。</p>
  </div>
</template>