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String.prototype.dateExpression¡£ÒòΪÈÕÆÚ´¦Àí¶¼»áÓõ½±í´ïʽ£¬ÀýÈçÔö¼Ó10Ì죬ÎÒÒ»°ã»áÓÃ10d»òÕß+10dÒ»±íʾ£¬
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function dateAdd(date1, date2, interval, number)
Date.prototype.dateAdd = function(expr) //expr, eg. +10d,-5y,
+20m.....
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//»ñÈ¡Èͮ򵀮«ÒÆÁ¿
//»ñÈ¡·ÖÎöºóµÄÈÕÆÚÆ«ÒÆÁ¿Êý¾Ý
String.prototype
.dateExpression
=
function
(
)
{
var
pattern =
"^[+-]\\
d+(ms)|[yMdhms]$"
;
//ÕâÀïÓиöС¼¼ÇÉ£¬(ms)Ó¦¸Ã·Åµ½Ç°Ã棬ÒòΪ·Åµ½ºóÃæ»áºÍm¼°s³åÍ»£¬
//»òÕßÒ²¿ÉÒÔ°Ñ[]µÄms·Öµ½²»Í¬µÄλÖã¬ÈçyMdmhs
var
reg =
new
RegExp(
pattern)
;
if
(
reg.test
(
this
)
)
{
var
interval =
this
.substr
(
this
.length
-
1
,
1
)
;
//µ¥Î»
var
symbol =
this
.substr
(
0
,
1
)
;
var
num =
parseInt(
this
.substr
(
1
,
this
.length
-
2
)
)
;
if
(
symbol ==
"-"
)
num =
-
num;
return
{
interval:
interval,
number:
num
}
}
else
{
return
null
;
}
}
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return
{
interval:
interval,
//ʱ¼ä²¿·ÖµÄËõд£¬Èçm±íʾ·ÖÖÓ£¬±íʾÄêµÈ
number:
num //·µ»ØÆ«ÒƵÄÊýÖµ
}
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