ASP函数详解.txt

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				ASP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
				    %>
				    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: 
				    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: 
				    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: 
				    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: 
				    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: 
				    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: 
				    RESULT: 45.267%
				
				Hour()
				    FUNCTION: 以24时返回小时数.
				    SYNTAX: Hour(time)
				    ARGUMENTS:
				    EXAMPLE: 
				    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: 
				    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: 
				    RESULT: 45
				
				Month()
				    FUNCTION: 返回日期.
				    SYNTAX: Month(date)
				    ARGUMENTS: date is any valid date expression.
				    EXAMPLE: 
				    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: 
				    RESULT: August
				
				Now()
				    FUNCTION: Returns the current system date and time.
				    SYNTAX: Now()
				    ARGUMENTS: None
				    EXAMPLE: 
				    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: 
				    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: 
				    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: 
				    RESULT: 1999
				
							

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