Reactのes5からes6変換

es5.js

var Index = React.createClass({
  getInitialState: function() {
      return {data: "test"};
  },
  testHandler: function(event) {
    console.log("test");
  }
  render: function(){
    return (
      <input type="button" value={this.state.data} onClick = {this.testHandler} />
    );
  }
});

es6.js

class Index extends React.Component{
  constructor(props){
     super(props);                                               
     this.state = {                                         
       data: "test",
     };
  }
  testHandler(event) {
    console.log("test");
  }
  render(){
    return (
      <input type="button" value={this.state.data} onClick = {this.testHandler.bind} />
    );
  }
}