react怎么修改对象的属性值

var NoLink = React.createClass({    getInitialState:function(){        return {message:""}    },    handelChange:function(event){        console.log(event.target);        this.setState({message:event.target.value})    },    render:function(){        var mess = this.state.message;        return (            <div>                <input type="text" onChange={this.handelChange} value={mess} />                <b>{mess}</b>            </div>        )    }});React.render(<NoLink />,document.body);

SetName = (e) = > {    let val = e.target.value;    let data = Object.assign({}, this.state.datavalue, {        name: val    })    this.setState({        datavalue: data    })    console.log(this.state.datavalue, data)}