React官方文档：初始化state

一、ES6写法

class Counter extends React.Component {
  constructor(props) {
    super(props);
    this.state = {count: props.initialCount};
  }
  // ...
}

二、非ES6写法：

var createReactClass = require('create-react-class');
var Counter = createReactClass({

  getInitialState: function(){
    return {count:this.props.initialCount}

  },
  render: function() {
    return <h1>count: , {this.state.count}</h1>;
  }
});