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)
}