React中static defaultProps报错问题详解

var MyDemo = React.createClass({
  getDefaultProps: function() {
    return {
      name: 'demo'
    };
  },
  render: function() {
    return <h1>This is my {this.props.name}</h1>;
  }
});

ReactDOM.render(
  <MyDemo />,
  document.getElementById('demo')
);

class MyDemo extends React.Component{
  constructor(props){
    super(props);
  }
//如果babel设置为es6的转码方式，会报错，因为定义静态属性不属于es6，而在es7的草案中。ES6的class中只有静态方法，没有静态属性。
  static defaultProps = {
    name: 'demo'
  }

  render(){
    return <h1>This is my {this.props.name}</h1>
  }
}

class MyDemo extends React.Component {
  constructor(props) {
    super(props);
  }
  render() {
    return <h1>This is my {this.props.name}</h1>
  }
}
//由于是用ES6 class语法创建组件，其内部只允许定义方法，而不能定义属性，class的属性只能定义在class之外。所以defaultProps要写在组件外部。
MyDemo.defaultProps = {
  name: 'demo'
};

// Install babel
npm install babel-core babel-loader --save-dev

// For ES6/ES2015 support
npm install babel-preset-es2015 --save-dev

// If you want to use JSX
npm install babel-preset-react --save-dev

// If you want to use experimental ES7 features
npm install babel-preset-stage-0 --save-dev

{
  "presets": ["es2015", "stage-0"],
  "plugins": ["transform-runtime"]
}

loaders:[
          {
            test: /\.js[x]?$/,
            exclude: /node_modules/,
            loader: 'babel-loader' ,
            query:{
              presets:['es2015','stage-0','react'],
              plugins:['transform-runtime']
            },
           }
          ]