我正在使用MDC反应选项卡
<TabBar activeIndex={this.state.activeIndex}
handleactiveIndexUpdate={this.handleactiveIndexUpdate}>
<Tab>
<span classname='mdc-tab__text-label'>Javascript</span>
</Tab>
<Tab>
<span classname='mdc-tab__text-label'>IOS</span>
</Tab>
<Tab>
<span classname='mdc-tab__text-label'>Android</span>
</Tab>
<Tab>
<span classname='mdc-tab__text-label'>Angular</span>
</Tab>
</TabBar>
如何加载每个标签的内容?