组件的生命周期分成三个状态:
- Mounting:已插入真实 DOM
- Updating:正在被重新渲染
- Unmounting:已移出真实 DOM
will
函数在进入状态之前调用,
did
函数在进入状态之后调用,三种状态共计五种处理函数。
- componentWillMount()
- componentDidMount()
- componentWillUpdate(object nextProps,object nextState)
- componentDidUpdate(object prevProps,object prevState)
- componentWillUnmount()
var Hello = React.createClass({ getInitialState: function () { return { opacity: 1.0 }; },componentDidMount: function () { this.timer = setInterval(function () { var opacity = this.state.opacity; opacity -= .05; if (opacity < 0.1) { opacity = 1.0; } this.setState({ opacity: opacity }); }.bind(this),100); },render: function () { return ( <div style={{opacity: this.state.opacity}}> Hello {this.props.name} </div> ); } }); ReactDOM.render( <Hello name="world"/>,document.body );