IDC资讯中心
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。
syntax:int(number)
arguments:
example:<%=int(32.89)%>
result:32
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
