js，7天时间间隔函数

function getDate(date){
         var base = new Date(date).getTime()
        var base1 = new Date(date).getTime()
         var oneDay = 24 * 3600 * 1000*6;
         var reStartDay = 24 * 3600 * 1000*7;
         var date = [];
         var data = [Math.random() * 300];
         var time = new Date(base);
         date.push([time.getFullYear(), time.getMonth() + 1, time.getDate()].join('-'));
         var now = new Date(base -= oneDay);
         var reNow=new Date(base1 -reStartDay)
            var redate=[reNow.getFullYear(), reNow.getMonth() + 1, reNow.getDate()].join('-')
         console.log()
         date.push([now.getFullYear(), now.getMonth() + 1, now.getDate()].join('-'));
         //date.push([now.getFullYear(), now.getMonth() + 1, now.getDate()].join('/'));
         /*for (var i = 1; i <7; i++) {
             var now = new Date(base -= oneDay);
             date.push([now.getFullYear(), now.getMonth() + 1, now.getDate()].join('/'));
             console.log(date)
             data.push(Math.round((Math.random() - 0.5) * 20 + data[i - 1]));
         }*/
         var newdate = date.reverse()
         //console.log(newdate)
            return {
                 newdate,
                redate,
            }
     }
     console.log(getDate("2020-12-7"))