gaearon/index.html

## index.html
<!DOCTYPE html>
<html>
  <head>
    <meta charset="UTF-8" />
    <title>Add React in One Minute</title>
  </head>
  <body>

    <h2>Add React in One Minute</h2>
    <p>This page demonstrates using React with no build tooling.</p>
    <p>React is loaded as a script tag.</p>

    <p>
      This is the first comment.
      <!-- We will put our React component inside this div. -->
      <div class="like_button_container" data-commentid="1"></div>
    </p>

    <p>
      This is the second comment.
      <!-- We will put our React component inside this div. -->
      <div class="like_button_container" data-commentid="2"></div>
    </p>

    <p>
      This is the third comment.
      <!-- We will put our React component inside this div. -->
      <div class="like_button_container" data-commentid="3"></div>
    </p>

    <!-- Load React. -->
    <!-- Note: when deploying, replace "development.js" with "production.min.js". -->
    <script src="https://unpkg.com/react@17/umd/react.development.js" crossorigin></script>
    <script src="https://unpkg.com/react-dom@17/umd/react-dom.development.js" crossorigin></script>

    <!-- Load our React component. -->
    <script src="like_button.js"></script>

  </body>
</html>

## like_button.js
'use strict';

const e = React.createElement;

class LikeButton extends React.Component {
  constructor(props) {
    super(props);
    this.state = { liked: false };
  }

  render() {
    if (this.state.liked) {
      return 'You liked comment number ' + this.props.commentID;
    }

    return e(
      'button',
      { onClick: () => this.setState({ liked: true }) },
      'Like'
    );
  }
}

// Find all DOM containers, and render Like buttons into them.
document.querySelectorAll('.like_button_container')
  .forEach(domContainer => {
    // Read the comment ID from a data-* attribute.
    const commentID = parseInt(domContainer.dataset.commentid, 10);
    ReactDOM.render(
      e(LikeButton, { commentID: commentID }),
      domContainer
    );
  });
	<!DOCTYPE html>
	<html>
	<head>
	<meta charset="UTF-8" />
	<title>Add React in One Minute</title>
	</head>
	<body>

	<h2>Add React in One Minute</h2>
	<p>This page demonstrates using React with no build tooling.</p>
	<p>React is loaded as a script tag.</p>

	<p>
	This is the first comment.
	<!-- We will put our React component inside this div. -->
	<div class="like_button_container" data-commentid="1"></div>
	</p>

	<p>
	This is the second comment.
	<!-- We will put our React component inside this div. -->
	<div class="like_button_container" data-commentid="2"></div>
	</p>

	<p>
	This is the third comment.
	<!-- We will put our React component inside this div. -->
	<div class="like_button_container" data-commentid="3"></div>
	</p>

	<!-- Load React. -->
	<!-- Note: when deploying, replace "development.js" with "production.min.js". -->
	<script src="https://unpkg.com/react@17/umd/react.development.js" crossorigin></script>
	<script src="https://unpkg.com/react-dom@17/umd/react-dom.development.js" crossorigin></script>

	<!-- Load our React component. -->
	<script src="like_button.js"></script>

	</body>
	</html>
	'use strict';

	const e = React.createElement;

	class LikeButton extends React.Component {
	constructor(props) {
	super(props);
	this.state = { liked: false };
	}

	render() {
	if (this.state.liked) {
	return 'You liked comment number ' + this.props.commentID;
	}

	return e(
	'button',
	{ onClick: () => this.setState({ liked: true }) },
	'Like'
	);
	}
	}

	// Find all DOM containers, and render Like buttons into them.
	document.querySelectorAll('.like_button_container')
	.forEach(domContainer => {
	// Read the comment ID from a data-* attribute.
	const commentID = parseInt(domContainer.dataset.commentid, 10);
	ReactDOM.render(
	e(LikeButton, { commentID: commentID }),
	domContainer
	);
	});