reactjs – onKeyDown事件不在React中的div上工作

componentWillMount() {
      document.addEventListener("keydown",this.onKeyPressed.bind(this));
  }

  componentWillUnmount() {
      document.removeEventListener("keydown",this.onKeyPressed.bind(this));
  }      

  onKeyPressed(e) {
    console.log(e.keyCode);
  }

  render() {
    let player = this.props.boards.dungeons[this.props.boards.currentBoard].player;
    return (
      <div 
        className="player"
        style={{ position: "absolute" }}
        onKeyDown={this.onKeyPressed} // not working
      >
        <div className="light-circle">
          <div className="image-wrapper">
            <img src={IMG_URL+player.img} />
          </div>
        </div>
      </div>
    )
  }

它工作正常,但我想在React风格中做得更多.我试过了

onKeyDown={this.onKeyPressed}

在组件上.但它没有反应.我记得它适用于输入元素.

Codepen：http://codepen.io/lafisrap/pen/OmyBYG

我该怎么做？