react 限制小數點位數

limitDecimals = value => {
        const reg = /^(\-)*(\d+)\.(\d).*$/;
        if (typeof value === 'string') {
            return !isNaN(Number(value)) ? value.replace(reg, '$1$2.$3') : '';
        } else if (typeof value === 'number') {
            return !isNaN(value) ? String(value).replace(reg, '$1$2.$3') : '';
        } else {
            return '';
        }
    };