JS获取当前日期前7天

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function getStandardDate(){
    var _date=new Date();
    var year=_date.getFullYear();
    var month=_date.getMonth()+1;
    var day=_date.getDate();
    if (month<10) {
        month='0'+month;
    };
    if (day<10) {
        day='0'+day;
    };
    return year+'-'+month+'-'+day;
}

function getStandardDateBeforeWeek(){
    var _date = new Date(); //获取今天日期
        _date.setDate(_date.getDate() - 7);//日期回到七天前
    var year=_date.getFullYear();
    var month=_date.getMonth()+1;
    var day=_date.getDate();
    if (month<10) {
        month='0'+month;
    };
    if (day<10) {
        day='0'+day;
    };

    var dateTemp = year+'-'+month+'-'+day;
    _date.setDate(_date.getDate() + 7);//日期重置
    return dateTemp;
}