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Asp常用函数
作者:未知 来源:未知 添加时间:2003年3月13日
长了点,但是很有用!



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 &#118alue 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 &#118alue 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

...
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