搜索文章:

首页  |  Java技术  |  Asp.net  |  Asp编程  |  VC/C++  |  Delphi  |  VB编程

asp常用函数

array()
 function: 返回一个数组
 syntax: array(list)
 arguments: 字符,数字均可
 example: <%
dim myarray()
for i = 1 to 7
  redim preserve myarray(i)
  myarray(i) = weekdayname(i)
next
%>
 result: 建立了一个包含7个元素的数组myarray
myarray("sunday","monday", ... ... "saturday")
 
cint()
 function: 将一个表达式转化为数字类型
 syntax: cint(expression)
 arguments: 任何有效的字符均可
 example: <%
f = "234"
response.write cint(f) + 2
%>
 result: 236
转化字符"234"为数字"234",如果字符串为空,则返回0值 
 
createobject()
 function: 建立和返回一个已注册的activex组件的实例。
 syntax: createobject(objname)
 arguments: objname 是任何一个有效、已注册的activex组件的名字.
 example: <%
set con = server.createobject("adodb.connection")
%>
 result: 
 
cstr()
 function: 转化一个表达式为字符串.
 syntax: cstr(expression)
 arguments: expression 是任何有效的表达式。
 example: <%
s = 3 + 2
response.write "the result is: " & cstr(s)
%>
 result: 转化数字“5”为字符“5”。
 
date()
 function: 返回当前系统日期.
 syntax: date()
 arguments: none.
 example: <%=date%>
 result: 8/4/99
 
dateadd()
 function: 返回一个被改变了的日期。
 syntax: dateadd(timeinterval,number,date)
 arguments: timeinterval is the time interval to add; number is amount of
time intervals to add; and date is the starting date.
 example: <%
currentdate = #8/4/99#
newdate = dateadd("m",3,currentdate)
response.write newdate
%>

<%
currentdate = #12:34:45 pm#
newdate = dateadd("h",3,currentdate)
response.write newdate
%>
 result: 11/4/99
3:34:45 pm

"m" = "month";
"d" = "day";

if currentdate is in time format then,
"h" = "hour";
"s" = "second";
 
datediff()
 function: 返回两个日期之间的差值 。
 syntax: datediff(timeinterval,date1,date2 [, firstdayofweek ][,
firstweekofyear]])
 arguments: timeinterval 表示相隔时间的类型,如“m“表示“月”。
 example: <%
fromdate = #8/4/99#
todate = #1/1/2000#
response.write "there are " & _
  datediff("d",fromdate,todate) & _
  " days to millenium from 8/4/99."
%>
 result: 从8/4/99 到2000年还有 150 天.
 
day()
 function: 返回一个月的第几日 .
 syntax: day(date)
 arguments: date 是任何有效的日期。 
 example: <%=day(#8/4/99#)%>
 result: 4
 
formatcurrency()
 function: 返回表达式,此表达式已被格式化为货币值 
 syntax: formatcurrency(expression [, digit ][, leadingdigit ][, paren ][,
groupdigit]]]])
 arguments: digit 指示小数点右侧显示位数的数值。默认值为 -1,指示使用的是
计算机的区域设置; leadingdigit 三态常数,指示是否显示小数值小数点前面的
零。 
 example: <%=formatcurrency(34.3456)%>
 result: $34.35
 
formatdatetime()
 function: 返回表达式,此表达式已被格式化为日期或时间
 syntax: formatdatetime(date, [, namedformat])
 arguments: namedformat 指示所使用的日期/时间格式的数值,如果省略,则使用
vbgeneraldate.
 example: <%=formatdatetime("08/4/99", vblongdate)%>
 result: wednesday, august 04, 1999
 
formatnumber()
 function: 返回表达式,此表达式已被格式化为数值.
 syntax: formatnumber(expression [, digit ][, leadingdigit ][, paren ][,
groupdigit]]]])
 arguments: digit 指示小数点右侧显示位数的数值。默认值为 -1,指示使用的是
计算机的区域设置。; leadingdigit i指示小数点右侧显示位数的数值。默认值为 -
1,指示使用的是计算机的区域设置。; paren 指示小数点右侧显示位数的数值。默认
值为 -1,指示使用的是计算机的区域设置。; groupdigit i指示小数点右侧显示位数
的数值。默认值为 -1,指示使用的是计算机的区域设置。.
 example: <%=formatnumber(45.324567, 3)%>
 result: 45.325
 
formatpercent()
 function: 返回表达式,此表达式已被格式化为尾随有 % 符号的百分比(乘以
100 )。 (%)
 syntax: formatpercent(expression [, digit ][, leadingdigit ][, paren ][,
groupdigit]]]])
 arguments: 同上.
 example: <%=formatpercent(0.45267, 3)%>
 result: 45.267%
 
hour()
 function: 以24时返回小时数.
 syntax: hour(time)
 arguments: 
 example: <%=hour(#4:45:34 pm#)%>
 result: 16
(hour has been converted to 24-hour system)
 
instr()
 function: 返回字符或字符串在另一个字符串中第一次出现的位置.
 syntax: instr([start, ] strtobesearched, strsearchfor [, compare])
 arguments: start为搜索的起始值,strtobesearched接受搜索的字符串 
strsearchfor要搜索的字符.compare比较方式(详细见asp常数)
 example: <%
strtext = "this is a test!!"
pos = instr(strtext, "a")
response.write pos
%>
 result: 9
 
instrrev()
 function: 同上,只是从字符串的最后一个搜索起
 syntax: instrrev([start, ] strtobesearched, strsearchfor [, compare])
 arguments: 同上.
 example: <%
strtext = "this is a test!!"
pos = instrrev(strtext, "s")
response.write pos
%>
 result: 13

 
int()
 function: 返回数值类型,不四舍五入,注意取值是不大于它的整数。
 syntax: int(number)
 arguments: 
 example: <%=int(32.89)%>  <%=int(-3.33)%>
 result: 32  -4
 
isarray()
 function: 判断一对象是否为数组,返回布尔值 .
 syntax: isarray(name)
 arguments: 
 example: <%
strtest = "test!"
response.write isarray(strtest)
%>
 result: false
 
isdate()
 function: 判断一对象是否为日期,返回布尔值
 syntax: isdate(expression)
 arguments: expression is any valid expression.
 example: <%
strtest = "8/4/99"
response.write isdate(strtest)
%>
 result: true
 
isempty()
 function: 判断一对象是否初始化,返回布尔值.
 syntax: isempty(expression)
 arguments: 
 example: <%
dim i
response.write isempty(i)
%>
 result: true
 
isnull()
 function: 判断一对象是否为空,返回布尔值.
 syntax: isnull(expression)
 arguments: 
 example: <%
dim i
response.write isnull(i)
%>
 result: false
 
isnumeric()
 function: 判断一对象是否为数字,返回布尔值.
 syntax: isnumeric(expression)
 arguments: 
 example: <%
i = "345"
response.write isnumeric(i)
%>
 result: true
就算数字加了引号,asp还是认为它是数字。
 
isobject()
 function: 判断一对象是否为对象,返回布尔值.
 syntax: isobject(expression)
 arguments: 
 example: <%
set con = server.createobject("adodb.connection")
response.write isobject(con)
%>
 result: true
 
lbound()
 function: 返回指定数组维的最小可用下标.
 syntax: lbound(arrayname [, dimension])
 arguments: ; dimension 指明要返回哪一维下界的整数。使用 1 表示第一维,2
表示第二维,以此类推。如果省略 dimension 参数,默认值为 1.
 example: <%
i = array("monday","tuesday","wednesday")
response.write lbound(i)
%>
 result: 0
 
lcase()
 function:  返回字符串的小写形式
 syntax: lcase(string)
 arguments: string is any valid string expression.
 example: <%
strtest = "this is a test!"
response.write lcase(strtest)
%>
 result: this is a test!
 
left()
 function: 返回字符串左边第length个字符以前的字符(含第length个字符).
 syntax: left(string, length)
 arguments: 
 example: <%
strtest = "this is a test!"
response.write left(strtest, 3)
%>
 result: thi
 
len()
 function: 返回字符串的长度.
 syntax: len(string | varname)
 arguments: 
 example: <%
strtest = "this is a test!"
response.write len(strtest)
%>
 result: 15
 
ltrim()
 function: 去掉字符串左边的空格.
 syntax: ltrim(string)
 arguments: 
 example: <%
strtest = " this is a test!"
response.write ltrim(strtest)
%>
 result: this is a test!
 
mid()
 function: 返回特定长度的字符串(从start开始,长度为length).
 syntax: mid(string, start [, length])
 arguments: 
 example: <%
strtest = "this is a test! today is monday."
response.write mid(strtest, 17, 5)
%>
 result: today
 
minute()
 function: 返回时间的分钏.
 syntax: minute(time)
 arguments: 
 example: <%=minute(#12:45:32 pm#)%>
 result: 45
 
month()
 function: 返回日期.
 syntax: month(date)
 arguments: date is any valid date expression.
 example: <%=month(#08/04/99#)%>
 result: 8
 
monthname()
 function: returns a string identifying the specified month.
 syntax: monthname(month, [, abb])
 arguments: month is the numeric representation for a given month; abb
(optional) is a boolean value used to display month abbreviation. true
will display the abbreviated month name and false (default) will not show
the abbreviation.
 example: <%=monthname(month(#08/04/99#))%>
 result: august
 
now()
 function: returns the current system date and time.
 syntax: now()
 arguments: none
 example: <%=now%>
 result: 8/4/99 9:30:16 am
 
replace()
 function: returns a string in which a specified sub-string has been
replaced with another substring a specified number of times.
 syntax: replace(strtobesearched, strsearchfor, strreplacewith [, start
][, count ][, compare]]])
 arguments: strtobesearched is a string expression containing a sub-
string to be replaced; strsearchfor is the string expression to search for
within strtobesearched; strreplacewith is the string expression to replace
sub-string strsearchfor; start (optional) is the numeric character
position to begin search; count (optional) is a value indicating the
comparision constant.
 example: <%
strtest = "this is an apple!"
response.write replace(strtest, "apple", "orange")
%>
 result: this is an orange!
 
right()
 function: 返回字符串右边第length个字符以前的字符(含第length个字符).
 syntax: right(string, length)
 arguments: .
 example: <%
strtest = "this is an test!"
response.write right(strtest, 3)
%>
 result: st!
 
rnd()
 function: 产生一个随机数.
 syntax: rnd [ (number) ]
 arguments: 
 example: <%
randomize()
response.write rnd()
%>
 result: 任何一个在0 到 1 之间的数
 
round()
 function: 返回按指定位数进行四舍五入的数值.
 syntax: round(expression [, numright])
 arguments: numright数字表明小数点右边有多少位进行四舍五入。如果省略,则
round 函数返回整数.
 example: <%
i = 32.45678
response.write round(i)
%>
 result: 32
 
rtrim()
 function: 去掉字符串右边的字符串.
 syntax: rtrim(string)
 arguments: 
 example: <%
strtest = "this is a test!! "
response.write rtrim(strtest)
%>
 result: this is a test!!
 
second()
 function: 返回秒.
 syntax: second(time)
 arguments: .
 example: <%=second(#12:34:28 pm#)%>
 result: 28
 
strreverse()
 function: 反排一字符串
 syntax: strreverse(string)
 arguments: 
 example: <%
strtest = "this is a test!!"
response.write strreverse(strtest)
%>
 result: !!tset a si siht
 
time()
 function: 返回系统时间.
 syntax: time()
 arguments: .
 example: <%=time%>
 result: 9:58:28 am
 
trim()
 function: 去掉字符串左右的空格.
 syntax: trim(string)
 arguments: string is any valid string expression.
 example: <%
strtest = " this is a test!! "
response.write trim(strtest)
%>
 result: this is a test!!
 
ubound()
 function: 返回指定数组维数的最大可用下标.
 syntax: ubound(arrayname [, dimension])
 arguments: ; dimension (optional) 指定返回哪一维上界的整数。1 表示第一
维,2 表示第二维,以此类推。如果省略 dimension 参数,则默认值为 1.
 example: <%
i = array("monday","tuesday","wednesday")
response.write ubound(i)
%>
 result: 2
 
ucase()
 function: 返回字符串的大写形式.
 syntax: ucase(string)
 arguments: 
 example: <%
strtest = "this is a test!!"
response.write ucase(strtest)
%>
 result: this is a test!!
 
vartype()
 function: 返回指示变量子类型的值
 syntax: vartype(varname)
 arguments: 
 example: <%
i = 3
response.write vartype(i)
%>
 result: 2(数字)详见"asp常数"
 
weekday()
 function: 返回在一周的第几天.
 syntax: weekday(date [, firstdayofweek])
 arguments: .
 example: <%
d = #8/4/99#
response.write weekday(d)
%>
 result: 4(星期三)
 
weekdayname()
 function: 返回一周第几天的名字.
 syntax: weekdayname(weekday [, abb ][, firstdayofweek]])
 arguments: abb可选。boolean 值,指明是否缩写表示星期各天的名称。如果省
略, 默认值为 false,即不缩写星期各天的名称.firstdayofweek指明星期第一天的
数值
 example: <%
d = #8/4/99#
response.write weekdayname(weekday(d))
%>
 result: wednesday
 
year()
 function: 返回当前的年份.
 syntax: year(date)
 arguments: 
 example: <%=year(#8/4/99#)%>
 result: 1999

()

相关文章:
© 2006   www.java-asp.net