asp常用函数用法
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asp 常用函数用法
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
