super2.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script crossdomain src="https://unpkg.com/react@16/umd/react.development.js"> </script> 
		<script crossdomain src="https://unpkg.com/react-dom@16/umd/react-dom.development.js"> </script> 
		<script src="https://unpkg.com/babel-standalone@6.15.0/babel.min.js"> </script>
		
</head>
<body>
    <div id="container"></div>
    <script type="text/babel">
        class Counter extends React.Component {
            constructor(props,context) {
                super(props,context);
                this.state = {
                    seconds: 0,
                };
                this.timeTick = this.
            }