如何在Javascript中计算两个日期之间的年和月？

有没有办法计算 Javascript 中两个不同日期之间的年数（也考虑闰年）和月份数？

这是我知道的获得年份和月份的最佳方法：

// Assumes Date From (df) and Date To (dt) are valid etc...
var df= new Date("01/15/2010");
var dt = new Date("02/01/2012");   
var allMonths= dt.getMonth() - df.getMonth() + (12 * (dt.getFullYear() - df.getFullYear()));
var allYears= dt.getFullYear() - df.getFullYear();
var partialMonths = dt.getMonth() - df.getMonth();
if (partialMonths < 0) {
    allYears--;
    partialMonths = partialMonths + 12;
}
var total = allYears + " years and " + partialMonths + " months between the dates.";
var totalMonths = "A total of " + allMonths + " between the dates.";
console.log(total);
console.log(totalMonths);  


return {jaren: allYears, maanden: partialMonths};