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javascript - 如何用cdn加载html中的es6、react、babel代码？

转载 作者：可可西里 更新时间：2023-11-01 02:33:32 27 4
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我有Codepen我尝试使用三个文件(index.html、main.js 和 style.css)在网页上复制的代码。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>

但是，它不起作用。我得到的只是这个错误

Uncaught SyntaxError: Unexpected token <

将此 react 代码加载到 HTML 需要哪些 CDN 脚本文件？

最佳答案

您需要使用babel standalone 脚本来转译代码，并且您需要包含react 和react-dom 的脚本，使用这些就可以了:

<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>

它与codepen一起工作的原因:检查设置/javascript，在那里你会发现babel被选为JavaScript Preprocessor，codepen自动包含脚本，但要在本地运行这些文件，您需要包含独立脚本。

更新:

1- 您需要在渲染 react 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>

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>

关于javascript - 如何用cdn加载html中的es6、react、babel代码？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/43931538/

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