在Javascript中添加/减去工作日

function addBusinessDays(startDate, numDays) {
  var currentDate = new Date(startDate);
  var businessDays = 0;

  while (businessDays < numDays) {
    currentDate.setDate(currentDate.getDate() + 1);

    if (currentDate.getDay() !== 0 && currentDate.getDay() !== 6) {
      businessDays++;
    }
  }

  return currentDate;
}

var startDate = new Date('2022-01-01');
var numDays = 3;

var result = addBusinessDays(startDate, numDays);
console.log(result);

var startDate = new Date('2022-01-01');
var numDays = -2;

var result = addBusinessDays(startDate, numDays);
console.log(result);