asp 常用函数用法
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