javascript - 如何在 JavaScript 中获得两个月(YYYYMM)之间的差异？

Question

var frommonth="201912";
var tomonth="201810";

从以上两个月中，我如何在 JavaScript 中获得两个月之间的差异？

var date1 = new Date(fromdate);
var date2 = new Date(todate);
var timeDiff = Math.abs(date2.getTime() - date1.getTime());
var diffDays = Math.ceil(timeDiff / (1000 * 3600 * 24)); 

var fromYear=date1.getFullYear();
var toYear=date2.getFullYear();
var diffyear =toYear-fromYear;

Answer 1

new Date()不解析YYYYMM。它将201912视为年份

所以使用match()来解析YYYYMM

var from = "201912";
var to = "201810";

function parseMonth(str) {
  return str.match(/(\d{4})(\d{2})/).splice(1).map(Number)
}

var [fromY, fromM] = parseMonth(from)
var [toY, toM] = parseMonth(to)

var result = (fromY - toY) * 12 + (fromM - toM)

console.log(result, 'months')