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  • 原生js封装的获取某一天是当年的第几周方法

               function getWeek(str){
                //str格式为yyy-mm-dd
                //周日归到了本周
                 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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  • 原文地址:https://www.cnblogs.com/hgdzjp/p/9804917.html
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