Javascript date.getYear() 在 2011 年返回 111？

Question

这个问题在这里已经有了答案:

Why does Javascript getYear() return a three digit number? (14 个回答)

关闭 5年前。

我有这个 javascript 用于自动将日期过滤器设置为上个月的第一天和最后一天:

$(document).ready(function () {
    $("#DateFrom").datepicker({ dateFormat: 'dd/mm/yy' });
    $("#DateTo").datepicker({ dateFormat: 'dd/mm/yy' });

    var now = new Date();
    var firstDayPrevMonth = new Date(now.getYear(), now.getMonth() - 1, 1);
    var firstDayThisMonth = new Date(now.getYear(), now.getMonth(), 1);
    var lastDayPrevMonth = new Date(firstDayThisMonth - 1);

    $("#DateFrom").datepicker("setDate", firstDayPrevMonth);
    $("#DateTo").datepicker("setDate", lastDayPrevMonth);
}); 

但是 now.getYear() 返回 111 而不是预期的 2011。有什么明显的我错过了吗？

Answer 1

https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Date/getYear

getYear is no longer used and has been replaced by the getFullYear method.

The getYear method returns the year minus 1900; thus:

• For years greater than or equal to 2000, the value returned by getYear is 100 or greater. For example, if the year is 2026, getYear returns 126.
• For years between and including 1900 and 1999, the value returned by getYear is between 0 and 99. For example, if the year is 1976, getYear returns 76.
• For years less than 1900, the value returned by getYear is less than 0. For example, if the year is 1800, getYear returns -100.
• To take into account years before and after 2000, you should use getFullYear instead of getYear so that the year is specified in full.