score:0

Accepted answer
class Block extends React.Component {
    render(){
        return (<div>Block</div>);
    }
}

$(document).ready(function(){
    $.each($('.block'), function(index, element){
        ReactDOM.render(
           <Block/>,
           element
        );
    })
});

///html

<body>
  <div class="block"></div>
  <div class="block"></div>
  <div class="block"></div>
  <div class="block"></div>
</body>

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