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<!DOCTYPE html>
<html>
<head>
<script src="https://fb.me/react-with-addons-0.14.7.min.js"></script>
<script src="https://fb.me/react-dom-0.14.7.min.js"></script>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
</head>
<body>
  <div class="main-container"></div>
</body>
</html>
 
class Container extends React.Component {
   constructor(props){
     super(props);
   }
   
   componentDidMount(){
     console.log('componentDidMount', Object.keys(this.refs));
   }
   
   render(){
     
     return (
       <div>{React.Children.map(this.props.children, (ch, i) => React.cloneElement(ch, { ref: 'ch' + i }))}</div>
     );
   }
}
​
ReactDOM.render(
  <Container>
    <div>hello</div>
    <div>world</div>
  </Container>, 
  document.querySelector('.main-container')
);
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