<! DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd" >
< html >
< head >
< meta  http-equiv ="Content-Type"  content ="text/html; charset=UTF-8" >
< title > 周选择工具 </ title >
</ head >
< body >
    
    
     < input  name ="weekPicker"  readonly ="readonly"  type ="text"  id ="weekPicker"   style ="width:150px" >
     < input  type ="button"  name ="Submit"  value ="上一周"  onClick ="javascript:pickWeek(-1)" >
     < input  type ="button"  name ="Submit2"  value ="下一周"  onClick ="javascript:pickWeek(1)" >

< script  type ="text/javascript" >

         function  getThisWeek(year,month,day) {
             var  today = new  Date(year,month - 1 ,day);
             var  week = today.getDay();
             if (week == 0 ) {
                week = 7 ;
            }
             var  monday = new  Date(today.valueOf() - (week - 1 ) * 24 * 60 * 60 * 1000 );
             var  sunday = new  Date(monday.valueOf() + 6 * 24 * 60 * 60 * 1000 );
             return  monday.getFullYear() + " - " + ((monday.getMonth() + 1 ).toString().length == 1 ? ( " 0 " + (monday.getMonth() + 1 )):(monday.getMonth() + 1 )) + " - " + (monday.getDate().toString().length == 1 ? " 0 " + monday.getDate():monday.getDate()) + "  到  " + sunday.getFullYear() + " - " + ((sunday.getMonth() + 1 ).toString().length == 1 ? ( " 0 " + (sunday.getMonth() + 1 )):(sunday.getMonth() + 1 )) + " - " + (sunday.getDate().toString().length == 1 ? " 0 " + sunday.getDate():sunday.getDate());
        }
        
         function  getPreviousWeek(year,month,day) {
             var  today = new  Date(year,month - 1 ,day);
             var  week = today.getDay();
             if (week == 0 ) {
                week = 7 ;
            }
             var  monday = new  Date(today.valueOf() - (week + 6 ) * 24 * 60 * 60 * 1000 );
             var  sunday = new  Date(monday.valueOf() + 6 * 24 * 60 * 60 * 1000 );
             return  monday.getFullYear() + " - " + ((monday.getMonth() + 1 ).toString().length == 1 ? ( " 0 " + (monday.getMonth() + 1 )):(monday.getMonth() + 1 )) + " - " + (monday.getDate().toString().length == 1 ? " 0 " + monday.getDate():monday.getDate()) + "  到  " + sunday.getFullYear() + " - " + ((sunday.getMonth() + 1 ).toString().length == 1 ? ( " 0 " + (sunday.getMonth() + 1 )):(sunday.getMonth() + 1 )) + " - " + (sunday.getDate().toString().length == 1 ? " 0 " + sunday.getDate():sunday.getDate());
        }
        
         function  getNextWeek(year,month,day) {
             var  today = new  Date(year,month - 1 ,day);
             var  week = today.getDay();
             if (week == 0 ) {
                week = 7 ;
            }
             var  monday = new  Date(today.valueOf() - (week - 8 ) * 24 * 60 * 60 * 1000 );
             var  sunday = new  Date(monday.valueOf() + 6 * 24 * 60 * 60 * 1000 );
             return  monday.getFullYear() + " - " + ((monday.getMonth() + 1 ).toString().length == 1 ? ( " 0 " + (monday.getMonth() + 1 )):(monday.getMonth() + 1 )) + " - " + (monday.getDate().toString().length == 1 ? " 0 " + monday.getDate():monday.getDate()) + "  到  " + sunday.getFullYear() + " - " + ((sunday.getMonth() + 1 ).toString().length == 1 ? ( " 0 " + (sunday.getMonth() + 1 )):(sunday.getMonth() + 1 )) + " - " + (sunday.getDate().toString().length == 1 ? " 0 " + sunday.getDate():sunday.getDate());
        }
    
         function  pickWeek(id) {
             var  year;
             var  month;
             var  day;
             if (id == 0 ) {
                 var  today = new  Date();
                year = today.getYear();
                month = today.getMonth() + 1 ;
                day = today.getDate();
            } else {
                 var  today = document.getElementById( " weekPicker " ).value.split( " 到 " )[ 0 ].split( " - " );
                year = today[ 0 ];
                month = today[ 1 ];
                day = today[ 2 ];                    
            }
             switch (id) {
                 case   0 : {
                    document.getElementById( " weekPicker " ).value = getThisWeek(year,month,day);
                     break ;
                }
                 case   1 : {
                    document.getElementById( " weekPicker " ).value = getNextWeek(year,month,day);
                     break ;
                }
                 case   - 1 : {
                    document.getElementById( " weekPicker " ).value = getPreviousWeek(year,month,day);
                     break ;
                }
            }
        }
        pickWeek( 0 );
     </ script >

</ body >
</ html >