Question

<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <script crossorigin src="https://unpkg.com/react@16/umd/react.development.js"></script><!--core react library-->
<script crossorigin src="https://unpkg.com/react-dom@16/umd/react-dom.development.js"></script><!--help us inject react into the dom-->

<title>Document</title>
</head>
<body>
    <div id="app">
       

    </div>
    <script type="text/babel">

    class App extends React.Component{
       render(){
          
            return <div>Helo</div>
        }
    }
    let divapp=document.getElementById('app')
    ReactDom.render(<App />,divapp);
    </script>
</body>
</html>

我已经尽了一切努力，搜索了很多答案，但是都没有帮助，我只是不明白为什么我的代码无法正常工作，我已经将我的代码与讲师的代码进行了交叉检查，但我仍然遇到黑屏出现在我面前，请帮忙。

Answer 1

您还需要bable.js标签中的head CDN。
ReactDOM不是ReactDom

<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <script crossorigin src="https://unpkg.com/react@16/umd/react.development.js"></script><!--core react library-->
<script crossorigin src="https://unpkg.com/react-dom@16/umd/react-dom.development.js"></script><!--help us inject react into the dom-->
<script src="https://unpkg.com/babel-standalone@6.26.0/babel.js"></script>
<title>Document</title>
</head>
<body>
    <div id="app">
       

    </div>
    <script type="text/babel">

    class App extends React.Component{
       render(){
          
            return <div>Helo</div>
        }
    }
    let divapp=document.getElementById('app')
    ReactDOM.render(<App />,divapp);
    </script>
</body>
</html>

Answer 2

我建议您遵循create-react-app方法，这是从reactjs开始的非常简单的方法。

检查一下。

https://reactjs.org/tutorial/tutorial.html

在：

下

设置选项2：本地开发环境

看看：

使用首选文字在本地进行跟踪的说明编辑器

Answer 3

<html lang="en">
  <head>
      <meta charset="UTF-8"/>
      <meta name="viewport" content="width=device-width, initial-scale=1.0"/>
      <meta http-equiv="X-UA-Compatible" content="ie=edge"/>
      <script src="https://unpkg.com/@babel/standalone/babel.min.js"></script>
      <script crossorigin src="https://unpkg.com/react@16/umd/react.development.js"></script>
  <script crossorigin src="https://unpkg.com/react-dom@16/umd/react-dom.development.js"></script>
  <script src="https://unpkg.com/babel-standalone@6.26.0/babel.js"></script>
  <title>Document</title>


  </head>
  <body>
    <script type="text/babel">
            class App extends React.Component {
              render() {

                      return <div>Helo</div>
                  }
              }
              let divapp=document.getElementById('app')
              ReactDOM.render(<App />,divapp);
    </script>
    <div id="app">    
    </div>

  </body>
  </html>

React组件未显示在浏览器上，出现空白屏幕

3 个答案: