ASP的函数详解

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join(expression,"连接符")

split :接收相关的参数，使之成为数组。

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)

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四舍五入的整数,相关函数：

Csng Cdbl 转为实数！

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