我正在阅读关于React的本教程.

我试着做这个例子.这是我的代码:

    import React from 'react'

    export default class App extends React.Component {      

    render() {

        function tick() {
            const element = (
                

                    
Hello, world!
                    
It is {new Date().toLocaleTimeString()}.
                
            );
        }

        return (    
            setInterval(tick, 1000) 
        );

    } 
}