复制dom元素，state不能获取

#1 
componentDidMount() {
		let i = 0;

		var itm = document.getElementsByClassName("test")[0];
		var cln = itm.cloneNode();
		document.getElementById("idid").appendChild(cln);
		setInterval(() => {
			// this.setState({
			// 	testa: i++
			// });
			this.testa = i + 1;
		}, 1000);
	}
render(){
return (
<div id="idid">
					<div className="test">{this.testa}</div>
				</div>
)
}