## React子父组件之间如何传值 //父组件 ``` setLevel(level){ this.setState({ level }) } <ImgFigureSection setLevel = { level =>this.setLevel(level) } level={this.state.level} randomUrls = {randomUrls} /> ``` //子组件 ``` if(this.props.setLevel){ setTimeout(()=>{ this.props.setLevel(this.state.level) },1000) } ```