react子组件向父组件传值

黑色框为父，绿色框为子，红色框为孙子。父向子孙传值用props；子孙向父传值，要在父设置接收函数和state，同时用props将函数名传入子孙。（总的来说就是给子组件传入父组件的方法，在子组件中调用）

//孙子组件
var Grandson = React.createClass({
    render: function(){
        return (
            <div style={{border: "1px solid red",margin: "10px"}}>{this.props.name}：
                <select onChange={this.props.handleSelect}>
                    <option value="男">男</option>
                    <option value="女">女</option>
                </select>
            </div>
        )
    }
});

//子组件
var Child = React.createClass({
    render: function(){
        return (
            <div style={{border: "1px solid green",margin: "10px"}}>
                {this.props.name}：<input onChange={this.props.handleVal}/>
                <Grandson name="性别" handleSelect={this.props.handleSelect}/>
            </div>
        )
    }
});

//父组件
var Parent = React.createClass({
    getInitialState: function(){
        return {
            username: '',
            sex: ''
        }
    },
    handleVal: function(value){
        this.setState({username: value});
    },
    handleSelect: function(value) {
        this.setState({sex: value});
    },
    render: function(){
        return (
            <div style={{border: "1px solid #000",padding: "10px"}}>
                <div>用户姓名：{this.state.username}</div>
                <div>用户性别：{this.state.sex}</div>
                <Child name="姓名" handleVal={this.handleVal} handleSelect={this.handleSelect}/>
            </div>
        )
    }
});
React.render(
  <Parent />,
  document.getElementById('test')
);

参考：https://blog.csdn.net/qizhiqq/article/details/52384554