js获取多少天以后的时间

// 获取多少天后的时间 getDateStr(today, addDayCount) { var dd; if (today) { dd = new Date(today); } else { dd = new Date(); } dd.setDate(dd.getDate() + addDayCount); //获取AddDayCount天后的日期 var y = dd.getFullYear(); var m = dd.getMonth() + 1 < 10 ? "0" + (dd.getMonth() + 1) : dd.getMonth() + 1; var d = dd.getDate() < 10 ? "0" + dd.getDate() : dd.getDate(); return y + "-" + m + "-" + d; }, }, created() { console.log(this.getDateStr("2020-10-22", 7)); console.log(this.getDateStr(null, 7)); },