React

by Allie Yu

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/react/16.13.1/umd/react.production.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/16.13.1/umd/react-dom.production.min.js"></script>
<div id="root"></div>

CSS

body {
  background: #20262E;
  padding: 20px;
  font-family: Helvetica;
}

#app {
  background: #fff;
  border-radius: 4px;
  padding: 20px;
  transition: all 0.2s;
}

li {
  margin: 8px 0;
}

h2 {
  font-weight: bold;
  margin-bottom: 15px;
}

.done {
  color: rgba(0, 0, 0, 0.3);
  text-decoration: line-through;
}

input {
  margin-right: 5px;
}

Babel + JSX

class App extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      isLoggedIn: true
    };
  }
  render() {
    return (
      <div className="App">
        <h1>
          This is a Demo showing several ways to implement Conditional Rendering
          in React.
        </h1>
        <button>Login</button>
        <button>Logout</button>
      </div>
    );
  }
}


const rootElement = document.getElementById("root");
ReactDOM.render(<App />, rootElement);