react 导航切换

<ul class="nav">
<li onClick={() => this.changeFontColor(0)} className={`${0 === this.state.active ? 'active' : ''}`}>点击1</li>
<li onClick={() => this.changeFontColor(1)} className={`${1 === this.state.active ? 'active' : ''}`}>点击2</li>
<li onClick={() => this.changeFontColor(2)} className={`${2 === this.state.active ? 'active' : ''}`}>点击3</li>
<li onClick={() => this.changeFontColor(3)} className={`${3 === this.state.active ? 'active' : ''}`}>点击4</li>
</ul>

changeFontColor = (val) => {
this.setState({
  active:val,
  isShow:!this.state.isShow
})

}