react_notes1.jsx

var SomeMixin = {
  doSomething() {
  }
}

Contacts = React.createClass({
  mixins: [SomeMixin],
  
  handleClick: function {
    this.doSomething(); // use mixin
  },
  
  render: function() {
    return (
      <div onClick={this.handleClick}></div>
    );
  }
});