如何用cdn在html中加载es6,react,babel代码？

Question

如何用cdn在html中加载es6,react,babel代码？

我有Codepen代码,我试图使用三个文件index.html,main.js和style.css在网页上复制.我尝试在HTML文件的head标签上加载这些脚本.

<script src="https://npmcdn.com/babel-transform-in-browser@6.4.6/dist/btib.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/0.14.7/react.min.js"></script>

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但是,它不起作用.我得到的只是这个错误

Uncaught SyntaxError: Unexpected token <

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什么是将此反应代码加载到HTML的必要CDN脚本文件？

Answer 1

May*_*kla 20

您需要使用babel standalone脚本来反编译代码,并且需要包含脚本react and react-dom,使用它们将起作用:

<script src="https://cdnjs.cloudflare.com/ajax/libs/babel-standalone/6.24.0/babel.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react-dom.min.js"></script>

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它与codepen一起工作的原因:检查设置/ javascript,你会发现babel被选为JavaScript预处理器,codepen自动包含脚本,但要在本地运行这些文件你需要包含standalone script.

更新:

1-您需要在渲染反应代码的div之后定义脚本,否则会抛出错误.像这样:

<body> 
   <div id="root"></div> 
   <script type="text/babel" src="pomodoro.js"></script>
</body>

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2-使用ReactDOM.render而不是React.render.

检查工作代码:

<html>

<head>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react-dom.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/babel-standalone/6.24.0/babel.js"></script>
<script src='https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.18.1/moment.min.js'></script>
</head>
<body>
   <div id='root'></div>
   <script type='text/babel'>
       class SetTimer extends React.Component{    
  render(){
    return (   
      <div className="set-timer">work <br/> session         
          <div className="minus-add">
            <button className="setting-button" id="minus-timer" onClick={this.props.minus}>-</button>
            <button className="setting-button" id="add-timer" onClick={this.props.add}>+</button>
          </div>
      </div>
    );
  }
} 

class SetBreak extends React.Component{
  
  render(){
    return (   
      <div className="set-break"> break<br/> session 
          <div className="minus-add">
            <button className="setting-button" id="minus-break" onClick={this.props.minusbreak}>-</button>
            <button className="setting-button" id="add-break" onClick={this.props.addbreak}>+</button>
          </div>
      </div>
    );
  }
} 

const leftPad = (time)=>{
  return (time<10)? '0'+time :time
}
const TimerDisplay = (props) => (   
  <div className="timer-display"><span className="worklabel">Work session time</span><br/>
      {props.currentTime}
      <div className="breaktime"><span className="breaklabel">break session time</span><br/>{props.breakTime}</div>
    </div>
);
// let baseTime= 25;
class App extends React.Component {
  constructor(){
    super();
    this.state = {
      baseTime:25,
      breakTime:5,
      currentTime: moment.duration(25,'minutes'),
      timer:null,
      startbuttonvisible:true,
      pausebuttonvisible:false,
      resumebuttonvisible:false,
      stopbuttonvisible:false,
    }
    this.minus =this.minus.bind(this);
    this.add =this.add.bind(this);
    this.minusbreak =this.minusbreak.bind(this);
    this.addbreak =this.addbreak.bind(this);
    this.startTimer = this.startTimer.bind(this);
    this.pauseTimer = this.pauseTimer.bind(this);
    this.resumeTimer = this.resumeTimer.bind(this);
    this.stopTimer = this.stopTimer.bind(this);
    this.reduceTimer = this.reduceTimer.bind(this);
    
  }
  add(){
    this.setState({
      baseTime:this.state.baseTime+1
    });
  }
  minus(){
    this.setState({
      baseTime:this.state.baseTime-1
    });
  }
  addbreak(){
    this.setState({
      breakTime:this.state.breakTime+1
    });
  }
  minusbreak(){
    this.setState({
      breakTime:this.state.breakTime-1
    });
  }
  startTimer(){
    this.setState({
      timer: setInterval(this.reduceTimer, 1000), 
      startbuttonvisible:false,
      pausebuttonvisible:true,
      stopbuttonvisible:true,
    });    
  }
  pauseTimer(){
    clearInterval(this.state.timer);
    this.setState({      
      pausebuttonvisible:false,
      resumebuttonvisible:true,
    });    
  }
  resumeTimer(){
    this.setState({
      timer: setInterval(this.reduceTimer, 1000), 
      startbuttonvisible:false,
      pausebuttonvisible:true,
      stopbuttonvisible:true,
      resumebuttonvisible:false,
    }); 
  }
  stopTimer(){
    clearInterval(this.state.timer);
    this.setState({
      baseTime:25,
      timer: null, 
      startbuttonvisible:true,
      pausebuttonvisible:false,
      stopbuttonvisible:false,
      resumebuttonvisible:false,
    });  
  }
  reduceTimer(){ 
    if(this.state.baseTime === 0) return;
    const newTime = this.state.baseTime - 1;
    this.setState({
      baseTime: newTime,
    });
  }
  render() {
    
    return (
      <div className="container">
         <div className="timebox">
            <div className="header">
                    Pomodoro Clock
            </div>
            <TimerDisplay currentTime={this.state.baseTime} breakTime={this.state.breakTime}/>
            <div id="action-title">
                <small>SETTINGS</small>
            </div>
            <div className="actions">
              <SetTimer minus={this.minus} add={this.add}/>
              <SetBreak minusbreak={this.minusbreak} addbreak={this.addbreak}/>
            </div>
           <div className="timer-control">
            {this.state.startbuttonvisible ? <button id="start-timer" onClick={this.startTimer}>
                START
            </button> : null}
           {this.state.pausebuttonvisible ? <button id="pause-timer" onClick={this.pauseTimer}>
                PAUSE
            </button>: null}
           {this.state.resumebuttonvisible ? <button id="resume-timer" onClick={this.resumeTimer}>
                RESUME
            </button>: null}
           {this.state.stopbuttonvisible ? <button id="stop-timer" onClick={this.stopTimer}>
                STOP
            </button>: null}
           </div>
        </div>
      </div>
    );
  }
}

ReactDOM.render(
  <App />,
  document.getElementById('root')
);

   </script>
</body>
</html>

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