ant-design/components/input-number/demo/digit.md

order	title
3	[{zh-CN 高精度小数} {en-US High precision decimals}]

zh-CN

通过 stringMode 开启高精度小数支持，onChange 事件将返回 string 类型。对于旧版浏览器，你需要 BigInt polyfill。

en-US

Use stringMode to support high precision decimals support. onChange will return string value instead. You need polyfill of BigInt if browser not support.

import { InputNumber } from 'antd';
import React from 'react';

const onChange = (value: string) => {
  console.log('changed', value);
};

const App: React.FC = () => (
  <InputNumber<string>
    style={{ width: 200 }}
    defaultValue="1"
    min="0"
    max="10"
    step="0.00000000000001"
    onChange={onChange}
    stringMode
  />
);

export default App;