function getWeek(str){//str格式為yyy-mm-dd//周日歸到了本周var d=new Date(str);var day=d.getDay();var originDate=d.getFullYear() '-' "01" '-' "01" ' 00:00:00';var nowDate=d.getFullYear() '-' ((d.getMonth() 1)>9?(d.getMonth() 1):'0' (d.getMonth() 1)) "-" (d.getDate()>9?d.getDate():'0' d.getDate()) ' 00:00:00';var nowStrapTime=(new Date(nowDate)).getTime();var originStrapTime=(new Date(originDate)).getTime();var originDay=((new Date(originStrapTime)).getDay())==0?7:((new Date(originStrapTime)).getDay());var nowDay=d.getDay()==0?7:d.getDay();var weeks=0;var resultStrap=0;if(nowDay>originDay){resultStrap=nowStrapTime-(nowDay-originDay)*1000*3600*24-originStrapTime;if(resultStrap>0){weeks=(resultStrap/(3600*1000*24*7)) 1;}else{weeks=1;}}else{resultStrap=nowStrapTime (originDay-nowDay)*1000*3600*24-originStrapTime;weeks=(resultStrap/(3600*1000*24*7)) 1;}return (d.getFullYear() "年第" weeks "周");}console.log(getWeek('2018-10-31'));//2018年第44周

　　

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