ReactNative--属性默认设置

    var ShowTitle = React.createClass({
      propTypes:{
        title: React.PropTypes.string.isRequired
      },
      render: function () {
        return <h1>{this.props.title}</h1>
      }
    });

    ReactDOM.render(
      <ShowTitle title=123/>,
      document.getElementById("container")
    )

    var MyTitle = React.createClass({
      getDefaultProps:function () {
        return {
          title:"lanou"
        };
      },
      render:function () {
        return <h1>{this.props.title}</h1>
      }
    });

    ReactDOM.render(
      <MyTitle />,
      document.getElementById("container")
    );