js sum函数

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