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ASP函数详解!(一)

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发表于 2004-10-19 09:32:06 | 显示全部楼层 |阅读模式
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: 8/4/99 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   %[/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: 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[/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: $34.35 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[/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, 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[/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: 45.325 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[/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: 9 InstrRev()   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: 13 Int()   FUNCTION: 返回数值类型,不四舍五入。   SYNTAX: Int(number)   ARGUMENTS:   EXAMPLE: <%=INT(32.89)%[/IMG]   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)   %[/IMG]   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)   %[/IMG]   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)   %[/IMG]   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)   %[/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: True LBound()   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: 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)   %[/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: 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)   %[/IMG]   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)   %[/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: Today Minute()   FUNCTION: 返回时间的分钏.   SYNTAX: Minute(time)   ARGUMENTS:   EXAMPLE: <%=Minute(#12:45:32 PM#)%[/IMG]   RESULT: 45 Month()   FUNCTION: 返回日期.   SYNTAX: Month(date)   ARGUMENTS: date is any valid date expression.   EXAMPLE: <%=Month(#08/04/99#)%[/IMG]   RESULT: 8 MonthName()   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: August Now()   FUNCTION: Returns the current system date and time.   SYNTAX: Now()   ARGUMENTS: None   EXAMPLE: <%=Now%[/IMG]   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[/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: 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)   %[/IMG]   RESULT: This is a test!! Second()   FUNCTION: 返回秒.   SYNTAX: Second(time)   ARGUMENTS: .   EXAMPLE: <%=Second(#12:34:28 PM#)%[/IMG]   RESULT: 28 StrReverse()   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 sihT Time()   FUNCTION: 返回系统时间.   SYNTAX: Time()   ARGUMENTS: .   EXAMPLE: <%=Time%[/IMG]   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)   %[/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: 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)   %[/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: Wednesday Year()   FUNCTION: 返回当前的年份.   SYNTAX: Year(date)   ARGUMENTS:   EXAMPLE: <%=Year(#8/4/99#)%[/IMG]   RESULT: 1999
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