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ASP函数大全2005-09-20 21:32:00

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ASP函数大全 ASP的函数详解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  %[/IMG]  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  %[/IMG]  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")  %[/IMG]  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)  %[/IMG]  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%[/IMG]  RESULT: 8/4/99DateAdd()  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  %[/IMG]  <%  currentDate = #12:34:45 PM#  newDate = DateAdd("h",3,currentDate)  response.write newDate  %[/IMG]  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[/IMG][/IMG])  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."  %[/IMG]  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#)%[/IMG]  RESULT: 4FormatCurrency()  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[/IMG][/IMG][/IMG][/IMG])  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)%[/IMG]  RESULT: $34.35FormatDateTime()  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[/IMG])  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)%[/IMG]  RESULT: Wednesday, August 04, 1999FormatNumber()  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[/IMG][/IMG][/IMG][/IMG])  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)%[/IMG]  RESULT: 45.325FormatPercent()  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[/IMG][/IMG][/IMG][/IMG])  ARGUMENTS: 同上.  EXAMPLE: <%=FormatPercent(0.45267, 3)%[/IMG]  RESULT: 45.267%Hour()  FUNCTION: 以24时返回小时数.  SYNTAX: Hour(time)  ARGUMENTS:  EXAMPLE: <%=Hour(#4:45:34 PM#)%[/IMG]  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, [/IMG] strToBeSearched, strSearchFor [, compare[/IMG])  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  %[/IMG]  RESULT: 9InstrRev()  FUNCTION: 同上,只是从字符串的最后一个搜索起  SYNTAX: InstrRev([start, [/IMG] strToBeSearched, strSearchFor [, compare[/IMG])  ARGUMENTS: 同上.  EXAMPLE: <%  strText = "This is a test!!"  pos = InstrRev(strText, "s")  response.write pos  %[/IMG]  RESULT: 13Int()  FUNCTION: 返回数值类型,不四舍五入。  SYNTAX: Int(number)  ARGUMENTS:  EXAMPLE: <%=INT(32.89)%[/IMG]  RESULT: 32IsArray()  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)  %[/IMG]  RESULT: FalseIsDate()  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)  %[/IMG]  RESULT: TrueIsEmpty()  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)  %[/IMG]  RESULT: TrueIsNull()  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)  %[/IMG]  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)  %[/IMG]  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)  %[/IMG]  RESULT: TrueLBound()  FUNCTION: 返回指定数组维的最小可用下标.  SYNTAX: Lbound(arrayname [, dimension[/IMG])  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)  %[/IMG]  RESULT: 0LCase()  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)  %[/IMG]  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)  %[/IMG]  RESULT: ThiLen()  FUNCTION: 返回字符串的长度.  SYNTAX: Len(string | varName)  ARGUMENTS:  EXAMPLE: <%  strTest = "This is a test!"  response.write Len(strTest)  %[/IMG]  RESULT: 15LTrim()  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)  %[/IMG]  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[/IMG])  ARGUMENTS:  EXAMPLE: <%  strTest = "This is a test! Today is Monday."  response.write Mid(strTest, 17, 5)  %[/IMG]  RESULT: TodayMinute()  FUNCTION: 返回时间的分钏.  SYNTAX: Minute(time)  ARGUMENTS:  EXAMPLE: <%=Minute(#12:45:32 PM#)%[/IMG]  RESULT: 45Month()  FUNCTION: 返回日期.  SYNTAX: Month(date)  ARGUMENTS: date is any valid date expression.  EXAMPLE: <%=Month(#08/04/99#)%[/IMG]  RESULT: 8MonthName()  FUNCTION: Returns a string identifying the specified month.  SYNTAX: MonthName(month, [, Abb[/IMG])  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#))%[/IMG]  RESULT: AugustNow()  FUNCTION: Returns the current system date and time.  SYNTAX: Now()  ARGUMENTS: None  EXAMPLE: <%=Now%[/IMG]  RESULT: 8/4/99 9:30:16 AMReplace()  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[/IMG][/IMG][/IMG])  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")  %[/IMG]  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)  %[/IMG]  RESULT: st!Rnd()  FUNCTION: 产生一个随机数.  SYNTAX: Rnd [ (number) [/IMG]  ARGUMENTS:  EXAMPLE: <%  Randomize()  response.write RND()  %[/IMG]  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[/IMG])  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)  %[/IMG]  RESULT: 32Rtrim()  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)  %[/IMG]  RESULT: This is a test!!Second()  FUNCTION: 返回秒.  SYNTAX: Second(time)  ARGUMENTS: .  EXAMPLE: <%=Second(#12:34:28 PM#)%[/IMG]  RESULT: 28StrReverse()  FUNCTION: 反排一字符串  SYNTAX: StrReverse(string)  ARGUMENTS:  EXAMPLE: <%  strTest = "This is a test!!"  response.write StrReverse(strTest)  %[/IMG]  RESULT: !!tset a si sihTTime()  FUNCTION: 返回系统时间.  SYNTAX: Time()  ARGUMENTS: .  EXAMPLE: <%=Time%[/IMG]  RESULT: 9:58:28 AMTrim()  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)  %[/IMG]  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[/IMG])  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)  %[/IMG]  RESULT: 2UCase()  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)  %[/IMG]  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)  %[/IMG]  RESULT: 2(数字)详见"asp常数"WeekDay()  FUNCTION: 返回在一周的第几天.  SYNTAX: WeekDay(date [, firstdayofweek[/IMG])  ARGUMENTS: .  EXAMPLE: <%  d = #8/4/99#  response.write Weekday(d)  %[/IMG]  RESULT: 4(星期三)WeekDayName()FUNCTION: 返回一周第几天的名字.SYNTAX: WeekDayName(weekday [, Abb [, firstdayofweek[/IMG][/IMG])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))%[/IMG]RESULT: WednesdayYear()  FUNCTION: 返回当前的年份.  SYNTAX: Year(date)  ARGUMENTS:  EXAMPLE: <%=Year(#8/4/99#)%[/IMG]  RESULT: 1999

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