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ASP常用函数详解

  文章作者:伊缘网来源:伊缘网浏览次数:3927字体:
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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


  Tags:  ASP  函数  详解  
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