tab 切换    
```html
      <div class="local-region">
        <s-tab @tabClick="stabClick" :show-divider="true">
          <tab-item>测试</tab-item>
          <tab-item>你好</tab-item>
          <tab-item>再见</tab-item>
          <tab-item>按钮</tab-item>
        </s-tab>

        <s-tab @tabClick="stabClick" position="bottom" cusClass='class' :default-active="2">
          <tab-item><img src="../assets/image/myInfo/about@2x.png"></tab-item>
          <tab-item><img src="../assets/image/myInfo/version@2x.png"></tab-item>
          <tab-item><img src="../assets/image/myInfo/setting@2x.png"></tab-item>
          <tab-item><img src="../assets/image/myInfo/speak@2x.png"></tab-item>
        </s-tab>
      </div>
``` 
