小编Gab*_*mas的帖子

我正在制作一个小型音频播放器应用程序并尝试将我的反应类组件转换为功能组件。

类组件的原始代码在这里：

class Player extends React.Component {

    constructor(){
    super()

    this.state = {
        tracks: [
          {title: "first track", data: track1},
          {title: "second track", data: track2},
          {title: "third track", data: track3},
        ],
        currentTrack: 0,
    }

    }

     changeData(trackIndex){
      this.setState({currentTrack: trackIndex})
    }
  
    render(){
        return <div style={{color: this.props.color}}>
            <h1>Player</h1>
           <AudioPlayer
            src= {this.state.tracks[this.state.currentTrack].data}
            />
            <div style={{color: "green"}}>
                <ul>
                    {this.state.tracks.map((trackElem, index) => (
                       <li onClick={()=> this.changeData(index)}>{trackElem.title}</li>
                    ))}
                </ul>
            </div>
        </div>
    }
}

我尝试了以下转换：

const Player2 = () => {

   const Items = [
          {title: "first track", data: …