js时间加减与时间对象与字符串之间的转换

 http://zheyiw.iteye.com/blog/809056

 //js时间的加法
 function timeAdd(){
     //7天的毫秒数   加7天
     var interval = 7*24*60*60*1000;
     var now = new Date();
     now.setTime(now.getTime()+interval);
 }

 //将js的时间对象转换为字符串yyyyMMddHHssmm
 function jsTimeToString(time){
     var year=time.getYear();
     var month=time.getMonth()+1;
     var day=time.getDate();
     var hour=time.getHours();
     var minute=time.getMinutes();
     var second=time.getSeconds();
     if(month<10){
         month="0"+month;
     }
     if(day<10){
         day="0"+day;
     }
     if(hour<10){
         hour="0"+hour;
     }
     if(minute<10){
         minute="0"+minute;
     }
     if(second<10){
         second="0"+second;
     }
     var strTime = year+""+month+""+day+""+hour+""+minute+""+second;
 return strTime;
 }

 //将字符串转换为js的时间对象，  字符串格式yyyyMMddHHssmm
 function stringToJsTime(time) {
     var y = time.substring(0,4);
     var m = time.substring(4,6)-1;
     var d = time.substring(6,8);
     var h = time.substring(8,10);
     var mm = time.substring(10,12);
     var ss = time.substring(12,14);
     var date = new Date(y,m,d,h,mm,ss,0);
     return date;
 }

 //将字符串转换为js的时间对象，  字符串格式yyyy-MM-dd HH:ss:mm
 function stringToJsTime_(timeString) {
     var y = timeString.substring(0,4);
     var m = timeString.substring(5,7)-1;
     var d = timeString.substring(8,10);
     var h = timeString.substring(11,13);
     var mm = timeString.substring(14,16);
     var ss = timeString.substring(17,19);
     var time = new Date(y,m,d,h,mm,ss,0);
     return time;
 }