gistfile1.js

var Page = React.createClass({
  getInitialState: function() {
    return {word: null};
  },
  
  componentDidMount: function() {
    var ws = new WebSocket("ws://url.com/ws");
    var self = this;
    ws.onmessage = function(msg) {
      self.setState({word: msg});
    }
  },
  
  render: function() {
    return (<span>{this.state.word}</span>)
  }
});

React.render(<Page />,
  document.body
);