ref 属性使用eslint报错

react 使用 ref 报错 ，[eslint] Using string literals in ref attributes is deprecated. (react/no-string-refs)

报错1:
var Hello = createReactClass({
  componentDidMount: function() {
    var component = this.refs.test;

  },
  render: function() {
    return <div ref="test">ref, test.</div>;
  }
});

正确：
var Hello = createReactClass({
   componentDidMount: function() {
     var component = this.test;

   },
   render() {
     return <div ref={(c) => { this.test = c; }}>test, ref.</div>;
   }
 });