javascript 如何将前导“0”添加到日期字符串的月/日？
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How to add leading "0" to month/day of date string?
提问by user2079233
so i wrote up a method that takes a number and subtracts the amount of months from the current date.
所以我写了一个方法，它需要一个数字并从当前日期中减去月数。
I am trying to figure out how can i add a '0' in front of the months that are less that 10. Also, how can I add a '0' in front on the days that are less than ten as well.
我想弄清楚如何在小于 10 的月份前添加“0”。此外，如何在小于 10 的天数前添加“0”。
Currently, when it returns the object (2012-6-9). It returns 6 and 9 with no '0' in front of it, can someone show me how to do it?
当前，当它返回对象时 (2012-6-9)。它返回 6 和 9，前面没有“0”，有人可以告诉我怎么做吗？
Here is my code
这是我的代码
lastNmonths = function(n) {
var date = new Date();
if (n <= 0)
return [date.getFullYear(), date.getMonth() + 1 , date.getDate()].join('-');
var years = Math.floor(n/12);
var months = n % 12;
if (years > 0)
date.setFullYear(date.getFullYear() - years);
if (months > 0) {
if (months >= date.getMonth()) {
date.setFullYear(date.getFullYear()-1 );
months = 12 - months;
date.setMonth(date.getMonth() + months );
} else {
date.setMonth(date.getMonth() - months);
}
}
}
return [date.getFullYear(), date.getMonth() + 1, date.getDate()].join('-');
};
回答by Arnaud Christ
You can also avoid testing if n < 10 by using :
如果 n < 10，您还可以使用以下方法避免测试：
("0" + (yourDate.getMonth() + 1)).slice(-2)
回答by srosh
you can write a little function like this :
你可以写一个这样的小函数：
function pad(n) {return (n<10 ? '0'+n : n);}
and pass month and day to it
并将月份和日期传递给它
return [date.getFullYear(),pad(date.getMonth() + 1), pad(date.getDate())].join('-');
回答by imalvinz
Try concat the "0":
尝试连接“0”：
month = date.getMonth() + 1 < 10 ? '0' + date.getMonth() + 1 : date.getMonth() + 1
return [date.getFullYear(), month, date.getDate()].join('-');
