React总结3：ES6下React组件的写法示例代码

class Hello extends React.Component {
render() {
return <h1>Hello, {this.props.value}</h1>;
}
}

class Hello extends React.Component {
// ...
}
Hello.propTypes = {
value: React.PropTypes.string
};
Hello.defaultProps = {
value: 'world'
};

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

lass SayHello extends React.Component {
constructor(props) {
super(props);
this.state = {message: 'Hello!'};
// 这行很重要
this.handleClick = this.handleClick.bind(this);
}
handleClick() {
alert(this.state.message);
}
render() {
// Because `this.handleClick` is bound, we can use it as an event handler.
return (
<button onClick={this.handleClick}>
Say hello
</button>
);
}
}