获取当天七天时间

dayArr(){
  for (let i=0;i<=-7;i--){
    console.log(this.getDay(i))
  }
},
//获取当前7天时间
getDay(day) {
  let today = new Date();
  let targetday_milliseconds = today.getTime() + 1000 * 60 * 60 * 24 * day;
  today.setTime(targetday_milliseconds); //注意，这行是关键代码
  let tYear = today.getFullYear();
  let tMonth = today.getMonth();
  let tDate = today.getDate();
  tMonth = this.doHandleMonth(tMonth + 1);
  tDate = this.doHandleMonth(tDate);
  return tYear + "-" + tMonth + "-" + tDate;
},
doHandleMonth(month) {
  let m = month;
  if (month.toString().length == 1) {
    m = "0" + month;
  }
  return m;
},