基本组件

Created: November-22, 2018

给出以下 HTML 文件：

index.html

<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8" />
    <title>React Tutorial</title>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.2.1/react.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.2.1/react-dom.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/babel-core/5.8.34/browser.min.js"></script>
  </head>
  <body>
    <div id="content"></div>
    <script type="text/babel" src="scripts/example.js"></script>
  </body>
</html>

你可以在单独的文件中使用以下代码创建基本组件：

脚本/ example.js

import React, { Component } from 'react';
import ReactDOM from 'react-dom';

class FirstComponent extends Component {
  render() {
    return (
      <div className="firstComponent">
        Hello, world! I am a FirstComponent.
      </div>
    );
  }
}
ReactDOM.render(
  <FirstComponent />, // Note that this is the same as the variable you stored above
  document.getElementById('content')
);

你将得到以下结果（注意 div#content 内部的内容）：

<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8" />
    <title>React Tutorial</title>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.2.1/react.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.2.1/react-dom.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/babel-core/5.8.34/browser.min.js"></script>
  </head>
  <body>
    <div id="content">
        <div className="firstComponent">
            Hello, world! I am a FirstComponent.
        </div>
    </div>
    <script type="text/babel" src="scripts/example.js"></script>
  </body>
</html>