解决React中setState调用时出现的错误

at success (http://localhost:8000/js/index.bundle.js?__VERSION:91:26)
at ajaxSuccess (http://localhost:8000/js/index.bundle.js?__VERSION:1906:31)
at XMLHttpRequest.xhr.onreadystatechange (http://localhost:8000/js/index.bundle.js?__VERSION:2107:99)

var $ = require('./zepto');
var React = require('react');
var ReactDOM = require('react-dom');
var test = document.getElementById('test');

class Test extends React.Component {
constructor() {
super();
this.state = {
DATA: "",
};
}

componentDidMount() {
$.ajax({
url: 'https://dev-promotion.chelun.com/GuangzhouCarShow/index?id=1',
type: 'GET',
success: function(res) {
this.setState({
DATA: res
});
console.log(res);
}
});
}

render() {
return (

);
}
}
ReactDOM.render(, test);

var $ = require('./zepto');
var React = require('react');
var ReactDOM = require('react-dom');
var test = document.getElementById('test');

class Test extends React.Component {
constructor() {
super();
this.state = {
DATA: "",
};
this.handleSuccess = this.handleSuccess.bind(this);
}

handleSuccess(res) {
this.setState({
DATA: res
});
console.log(res);
}

componentDidMount() {
$.ajax({
url: 'https://dev-promotion.chelun.com/GuangzhouCarShow/index?id=1',
type: 'GET',
success: this.handleSuccess
});
}

render() {
return (

);
}
}
ReactDOM.render(, test);