思路：当前日期天数+7
直接上代码：

function getSpecialTime() {var currentDate;var arry  = currentDate.split("-");var year = parseInt(arry[0],10);var month = parseInt(arry[1],10);var day = parseInt(arry[2],10); //月份的方法：getMonth()从 Date 对象返回月份 (0 ~ 11)。var structDate = new Date(year , month - 1, day);var num  = parseInt(7,10); //setDate增减天数structDate.setDate(structDate.getDate()+num); //如果月份长度少于2，则前加 0 补位   if((structDate.getMonth() + 1).toString().length == 1) {  month = 0 + "" + (structDate.getMonth() + 1).toString();  } else {    month = (structDate.getMonth() + 1).toString();  }   //如果天数长度少于2，则前加 0 补位   if (structDate.getDate().toString().length == 1) {   day = 0 + "" + structDate.getDate().toString();   } else {    day = newDate.getDate().toString();   }    var newDate = newDate.getFullYear() + "-" + monthString + "-" + dayString;   }