JS获取当前是第几周
1.JS获取当前是今年的第几天，今年的第几周
var
d1
= new
Date();
var
d2
= new
Date();
d2.setMonth(
0
);
d2.setDate(
1
);
var
rq
=
d1
-
d2;
var
s1
=
Math.ceil(rq
/
(
24
*
60
*
60
*
1000
));
var
s2
=
Math.ceil(s1
/
7
);
alert(
"今天是本年第"
+
s1
+
"天，第"
+
s2
+
"周"
);
2.获取周别(直接保存成Html)
DOCTYPE
html>
<
html
>
<
head
>
<
meta
charset
=
"UTF-8"
>
<
title
>
title
>
head
>
<
body
>
<
script
>
'use strict'
;
function
formatDig
(
num
){
return
num
>
9
?
''
+
num
:
'0'
+
num;
}
function
formatDate
(
mill
){
var
y
=new
Date(mill);
let
raws
=
[
y.getFullYear(),
formatDig(y.getMonth()
+
1
),
formatDig(y.getDate()),
// y.getDay()||7
];
// let format=['年','月','日 星期'];
let
format
=
[
'-'
,
'-'
,
''
];
return
String.raw({raw
:
raws},...format);
}
function
*
createWeeks
(
year
){
const
ONE_DAY
=
24
*
3600
*
1000
;
let
start
=new
Date(year,
0
,
1
),
end
=new
Date(year,
11
,
31
);
let
firstDay
=
start.getDay()
||
7
,
lastDay
=
end.getDay()
||
7
;
let
startTime
=+
start,
endTime
=
startTime
+
(
7
-
firstDay)
*
ONE_DAY
,
_endTime
=
end
-
(
7
-
lastDay)
*
ONE_DAY
;
yield [startTime,endTime];
startTime
=
endTime
+
ONE_DAY
;
endTime
=
endTime
+
7
*
ONE_DAY
;
while
(endTime
<
_endTime){
yield [startTime,endTime];
startTime
=
endTime
+
ONE_DAY
;
endTime
=
endTime
+
7
*
ONE_DAY
;
}
yield [startTime,
+
end];
}
let
index
=
1
;
var
year_mm
=
'2017'
;
var
data1_mm
=
''
;
var
data2_mm
=
''
;
var
datamm_year
=
{};
for
(
let
i
of
createWeeks(year_mm)){
let
start
=
i[
0
],
end
=
i[
1
];
//console.log(`w${formatDig(index++)} ${formatDate(start)}/${formatDate(end)}`);
data1_mm
=
`w${formatDig(index
++
)}`;
data2_mm
=
`${formatDate(start)}/${formatDate(end)}`;
datamm_year[data1_mm]
=
data2_mm;
}
consol
e.log(datamm_year);
script
>
body>