function dateGetter(name, size, offset, trim) {
return function(date) {
var value = date["get" + name]()
if (offset > 0 || value > -offset)
value += offset
if (value === 0 && offset === -12) { // hh h的情况
value = 12
}
return padNumber(value, size, trim)
}
} var DATE_FORMATS = {
yyyy: dateGetter("FullYear", 4),
yy: dateGetter("FullYear", 2, 0, true),
y: dateGetter("FullYear", 1),
MM: dateGetter("Month", 2, 1),
M: dateGetter("Month", 1, 1),
dd: dateGetter("Date", 2),
d: dateGetter("Date", 1),
HH: dateGetter("Hours", 2),
H: dateGetter("Hours", 1),
hh: dateGetter("Hours", 2, -12),
h: dateGetter("Hours", 1, -12),
mm: dateGetter("Minutes", 2),
m: dateGetter("Minutes", 1),
ss: dateGetter("Seconds", 2),
s: dateGetter("Seconds", 1),
sss: dateGetter("Milliseconds", 3)
} console.log(DATE_FORMATS.HH(new Date()))