数字加减问题解决精度问题

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function plus(num1, num2) {
    const num1Digits = (num1.toString().split('.')[1] || '').length;
    const num2Digits = (num2.toString().split('.')[1] || '').length;
    const baseNumber = Math.pow(10, Math.max(num1Digits, num2Digits));
    return (num1 * baseNumber + num2 * baseNumber) / baseNumber;
}

function minus(num1, num2) {
    return plus(num1, -1 * num2);
}