js简单输出YYYY-MM-DD格式的函数

              function getStandTimer(num){
                    let standTime = null;
                    let thisData = new Date();
                    let msec =  thisData.getTime() + 86400000*num;
                    let data = new Date(msec)
                    let year = data.getFullYear();
                    let month = data.getMonth()+1;
                    let day = data.getDate();
                    if(month<10){month = '0' + month}
                    if(day<10){day = '0' + day};
                    standTime = year + '-' + month + '-' + day;
                    return standTime;
                }

使用:

当前时间：var nowTime = getStandTimer(0)

7天后：var sevenAfterTime = getStandTimer(7)

6天前：var sixBeforTime = getStandTimer(-6)