Reactjs, Super expression must either be null or a function

Question

I use the React to write this demo. I use the Webpack to build this demo.When I start this demo, the error will show me.

The error:

Uncaught

Answer 1

try following:

        import React, {Component} from 'react';
        import ReactDOM from 'react-dom';
        class App extends React.Compoment {
          constructor(props){
            super(props);
            this.myTextInput = this.myTextInput.bind(this);
            this.handleClick = this.handleClick.bind(this);
          }
          handleClick(){
            if(this.myTextInput !=null) {
              this.myTextInput.focus();
            }
          }
          render (){
            return (
              

                 this.myTextInput = ref} />
                
              
            );
          }
        }
        ReactDOM.render(, document.getElementById('app'));