js獲取上周、上個月時間開始時間和結束時間

 //獲取系統當前時間 var nowdate = new Date(); var y = nowdate.getFullYear(); var m = nowdate.getMonth()+1; var d = nowdate.getDate(); var formatnowdate = y+'-'+m+'-'+d; console.log(formatnowdate) //獲取過去一周的時間

var myDate = new Date();

var weekDate = new Date(myDate.getTime() - 7 * 24 * 3600 * 1000);// 計算開始時間用

var weekDate2 = new Date(myDate.getTime() - 7 * 24 * 3600 * 1000);// 計算結束時間用

var day = weekDate.getDay();

var time = weekDate.getDate()-day+(day===0?-6:1);

var startDate = new Date(weekDate.setDate(time));

var beginTime = startDate.getFullYear()+'-'+(startDate.getMonth()+1)+'-'+startDate.getDate();

var endDate = new Date(weekDate2.setDate(time+6));

var endTime = endDate.getFullYear()+'-'+(endDate.getMonth()+1)+'-'+endDate.getDate();

 //獲取系統前一個月的時間 nowdate.setMonth(nowdate.getMonth()-1); var y = nowdate.getFullYear(); var m = nowdate.getMonth()+1; var d = nowdate.getDate(); var formatwdate = y+'-'+m+'-'+d; console.log(formatwdate)