我正在使用 React.js 和 HTML5 网络音频 javascript API 制作 mp3 播放器。我刚刚学习 React 两个星期，所以我只是习惯了结构和设置（使用组件等），但有几年的 JavaScript 经验。

在浏览器中使用 React 时，我让 mp3 播放器工作。即我有一个 index.html 文件，我包含了 React 脚本，如下所示：

<script src="js/react.min.js"></script>
<script src="js/react-dom.min.js"></script>
<script src="js/browser.min.js"></script>

现在我想习惯于使用命令行和 localhost 构建 React 应用程序，所以我开始重写代码以在此环境中使用。我首先创建了骨架应用程序，如下所示：

create-react-app my-app
cd my-app/
npm start

然后我添加了我自己的组件等。该应用程序在 localhost:3000 上正确显示，但是音频文件似乎没有在这种环境中播放。我不确定问题是否与 HTML5 音频直接相关，只是在 localhost 中不起作用，或者是其他问题。没有返回错误。

我已经简化了我的代码，并且暂时在 mp3 文件的目录中硬编码到音频标签（请参阅 AudioPlayer 组件），以查看是否可以让音频元素正常工作。

你能看到我可能遗漏的任何东西吗？谢谢

应用组件

    import React, { Component } from 'react';
    import Header from './Header';

    import AudioPlayer from './AudioPlayer';

    import Controls from './Controls';

    import './music-player.css';
    import './css/font-awesome.css';


    class App extends Component {

         //This class is the main component of the application.
         //it contains the header, the audio player and the side panel components.
         constructor(props) {
                super(props);
                this.state = {
                sidePanelIsOpen: false,
                currentSoundIndex: 0,
                isPlaying: false,
                playerDuration: 0,
                currentTime: "0:00",
                currentWidthOfTimerBar: 0,
                backButtonIsDisabled: false,
                forwardButtonIsDisabled: false,
                playButtonIsDisabled: false


            };
            this.toggleSidePanel = this.toggleSidePanel.bind(this);

        }   
        componentDidMount() {
            this.player = document.getElementById('audio_player');
            this.player.load();
            this.player.play(); //this is not doing anything
        }   
        toggleSidePanel(){
            var sidePanelIsOpen = this.state.sidePanelIsOpen;
            this.setState({sidePanelIsOpen: !sidePanelIsOpen})
        }


        render() {


            return(<div>
                <div id="main-container" className={this.state.sidePanelIsOpen === true ? 'swipe-left' : ''}>
                <div className="overlay">

                <AudioPlayer sounds={this.props.sounds} currentSoundIndex={this.state.currentSoundIndex} />
                </div>  
                </div>


                <div id="side-panel-area" className="scrollable">       
                    <div className="side-panel-container">
                    <div className="side-panel-header"><p>Menu</p></div>

                    </div>
                </div>
                </div>
            );  
        }

    }

    export default App;

音频播放器组件

    import React, { Component } from 'react';
    import './music-player.css';

    const AudioPlayer = function(props) {
        var mp3Src = props.sounds[props.currentSoundIndex].mp3;
        console.log(mp3Src); //this is returning the correct mp3 value
            return (<audio id="audio_player">
            <source id="src_mp3" type="audio/mp3" src="sounds/0010_beat_egyptian.mp3" />
            <source id="src_ogg" type="audio/ogg" src=""/>
            <object id="audio_object" type="audio/x-mpeg" width="200px" height="45px" data={mp3Src}>
                <param id="param_src" name="src" value={mp3Src} />
                <param id="param_src" name="src" value={mp3Src} />
                <param name="autoplay" value="false" />
                <param name="autostart" value="false" />
            </object>
            </audio>    
            );

    }

    export default AudioPlayer;

索引.js

import React from 'react';
import ReactDOM from 'react-dom';
import App from './App';
import registerServiceWorker from './registerServiceWorker';
import './music-player.css';

var sounds = [{"title" : "Egyptian Beat", "artist" : "Sarah Monks", "length": 16, "mp3" : "sounds/0010_beat_egyptian.mp3"}, 
        {"title" : "Euphoric Beat", "artist" : "Sarah Monks", "length": 31, "mp3" : "sounds/0011_beat_euphoric.mp3"},
        {"title" : "Latin Beat", "artist" : "Sarah Monks", "length": 59, "mp3" : "sounds/0014_beat_latin.mp3"}, 
        {"title" : "Pop Beat", "artist" : "Sarah Monks", "length": 24, "mp3" : "sounds/0015_beat_pop.mp3"},
        {"title" : "Falling Cute", "artist" : "Sarah Monks", "length": 3, "mp3" : "sounds/0027_falling_cute.mp3"}, 
        {"title" : "Feather", "artist" : "Sarah Monks", "length": 6, "mp3" : "sounds/0028_feather.mp3"},
        {"title" : "Lose Cute", "artist" : "Sarah Monks", "length": 3, "mp3" : "sounds/0036_lose_cute.mp3"}, 
        {"title" : "Pium", "artist" : "Sarah Monks", "length": 3, "mp3" : "sounds/0039_pium.mp3"}];

ReactDOM.render(<App sounds={sounds} />, document.getElementById('root'));

registerServiceWorker();