TIL-react input focus

onSubmit = (e) => {
	e.preventDefault();
    if(parseImt(this.state.value) ===this.state.first * this.state.second){
    	this.serState((prevState)=>{
        	return {
            	result : "" +prevState.value,
                first : Math.ceil(Math.random() * 9)
            };
        });
        this.input.focus(); // 다시 입력창에 포커스
    }else {
    	this.setState({
        result : "".
        value:'',
        })
     }
};
input;
onRefInput = (c) = { this.input = c };

render(){
	return(
    <>
    <form onSubmit={this.onSubmit>
	<input ref ={ this.onRefInput } type="" value ={this. state. value}
    	inChange={this.onChange}/>
    </form>
    <div>{this.state.result}</div>
    </>
    )
}