moment.js 經常使用（幾天前、相差幾天、天然周、天然月）

let pickDate = moment(this.searchForm.date);

let firstDay = pickDate.day(0).format('YYYYMMDD');//上週天

let lastDay = pickDate.day(7).format('YYYYMMDD');//周天

let previousDate = moment(this.searchForm.date).subtract(1, "weeks").format("YYYY-MM-DD");//上週

let diff = pickDate.diff(moment(), 'days');//相差幾天

 

 

var today = moment().format('YYYY-MM-DD');

var last7 = moment().subtract('days', 6).format('YYYY-MM-DD');//7天前

var lart30 = moment().subtract('days', 29).format('YYYY-MM-DD');//30天前

 

let week = moment(this.searchForm.week);

startTime = week.startOf('week').format('YYYYMMDD');//周初

endTime = week.endOf('week').format('YYYYMMDD');//週末

 

let month = moment();

startTime = month.startOf('month');//月初

endTime = month.endOf('month');//月末