日期

日期前一周的时间显示：

//时间格式化

function timeFormat() {
    var date = new Date(), y = date.getFullYear(), m = date.getMonth() + 1, d = date.getDate(),
        nowDate = y + "-" + m + "-" + d;
    return nowDate;
}
//当前日期后退一周的时间   时间格式：yyyy-yy-yy
function get7DaysBefore(date){
    var date = date || new Date(),
        timestamp, newDate;
    if(!(date instanceof Date)){
        date = new Date(date.replace(/-/g, '/'));
    }
    timestamp = date.getTime();
    newDate = new Date(timestamp - 7 * 24 * 3600 * 1000);
    return [newDate.getFullYear(), newDate.getMonth() + 1, newDate.getDate()].join('-');
}