https://blog.csdn.net/suwyer/article/details/81481507(copy)
<div style={{display: (index===this.state.currentIndex) ? "block" : "none"}}>此標簽是否隱藏</div>
<div style={{display: (index===this.state.currentIndex) ? "block" : "none", color:"red"}}>此標簽是否隱藏</div>
<div className={index===this.state.currentIndex?"active":null}>此標簽是否選中</div>
<div className={`container tab ${index===this.state.currentIndex?"active":null}`}>此標簽是否選中</div>
最好一種推薦使用