/**

  * 优惠券有效期

  * startDate:起始日期

  * valueTime：有效天数

  */

 function transferCouponValueTime(startDate,valueTime){

	 var date = new Date(startDate);

	 var newDate = new Date(date.getFullYear(),date.getMonth(),date.getDate()+valueTime);

	 var year1 = date.getFullYear();

	 var month1 = date.getMonth()+1;

	 var day1 = date.getDate();

	 var year2 = newDate.getFullYear();

	 var month2 = newDate.getMonth()+1;

	 var day2 = newDate.getDate();

	 return "<span>"+year1+"</span>-<span>"+month1+"</span>-<span>"+day1+"</span>一<span>"

	 						+year2+"</span>-<span>"+month2+"</span>-<span>"+day2+"</span>";

 }