样式结果

 

 定义html

    <view class="button-group">
      <button :class="{ 'active': selectedButton === index }"
        v-for="(button, index) in buttons" :key="index" @click="handleButtonClick(index)">
        {{ button }}
      </button>
    </view>

 声明变量

buttons: ['button1', 'button2', 'button3'],
selectedButton: 0

  处理按钮点击事件

      handleButtonClick(index) {
        this.selectedButton = index;
        console.log(`Button ${index + 1} clicked`);
      },

 样式

  .button-group {
    display: flex;
    justify-content: space-between;
    margin: 20px;
  }
  button {
    flex: 1;
    font-weight: bold;
    border: 1px solid #b9b9b9;
    border-left: none;
    border-radius: 0;
    font-size: 16px;
    padding: 0;
  }
  button:first-child {
    border-left: 1px solid #b9b9b9;
    border-top-left-radius: 5px;
    border-bottom-left-radius: 5px;
  }
  button:last-child {
    border-top-right-radius: 5px;
    border-bottom-right-radius: 5px;
  }
  button.active {
    border-color: #2C52B9;
    color: #2C52B9;
    box-shadow: -1px 0 0 0 #4A81FF;
  }
  button:first-child.active {
    box-shadow: none;
  }