YuShu Hsiao

// 取得日期(系統日+幾天)
function AddDays(days)
{
	let _now = new Date();
  let _addDate = new Date(_now);
  _addDate.setDate(_addDate.getDate() + days);
	return _addDate;
}

//var _date = AddDays(7);
//console.log(_date);


// 取得日期(指定日期 + 天數)
function DateAddDays(_date,days)
{
	// console.log(typeof(_date));
	let _result = new Date(_date);
  _result.setDate(_result.getDate() + days);
  return _result;
}


var _date = new Date(2019,6,16);
var _newDate = DateAddDays(_date,7);
console.log(_date);
console.log(_newDate);