js获取指定日期的前指定天数_js获取指定日期的前几天

 getSelectWeek() {//当前日期的前7天日期，当天也算一天
 let data = new Date();
 console.log(this.returnday(data, 6))
},


returnday(date, i) {
   //data是日期，i是往前推多少天
   let newDate = new Date(date.getTime() - i * 1000 * 60 * 60 * 24);
   let year = newDate.getFullYear();
   let month =
     parseInt(newDate.getMonth()) + 1 > 9
       ? parseInt(newDate.getMonth()) + 1
       : "0" + (parseInt(newDate.getMonth()) + 1);
   let day =
     newDate.getDate() > 9 ? newDate.getDate() : "0" + newDate.getDate();
   let fullDate = `${year}-${month}-${day}`;
   // console.log(fullDate);
   return fullDate;
 },
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