核心提示：一：定义React组件class Hello extends React.Component { render() {return Hello, {this.props.value}; } }二：声明...
一：定义React组件
class Hello extends React.Component {
render() {
return
Hello, {this.props.value}
; } }二：声明prop类型与默认prop
class Hello extends React.Component {
// ...
}
Hello.propTypes = {
value: React.PropTypes.string
};
Hello.defaultProps = {
value: 'world'
};
三、设置初始state
class Hello extends React.Component {
constructor(props) {
super(props);
this.state = {count: props.initialCount};
}
// ...
}
四、自动绑定
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 (
);
}
}
