数字转2位数字文本

export default function num2str(n: number) {
	const f = Math.round(n * 100) / 100;
	let s = f.toString();
	const rs = s.indexOf('.');
	if (rs < 0) {
		return `${s}.00`;
	}
	while (s.length <= rs + 2) {
		s += '0';
	}
	return s;
}

()=>{
const [str, setstr] = useState('0.0');
function num2str(n) {
	const f = Math.round(n * 100) / 100;
	let s = f.toString();
	const rs = s.indexOf('.');
	if (rs < 0) {
		return `${s}.00`;
	}
	while (s.length <= rs + 2) {
		s += '0';
	}
	return s;
}
return <>
	<div>
		<span>type number:</span> <input type='number' max={100.00} min={-2.99} onChange={(e)=>{
	const val = Number(e.target.value);
	setstr(num2str(val));
}} />
	</div>
	<div>
		<h3>${str}</h3>
	</div>
</>;
}