asp 需要掌握的常用函数

ASP函数

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 [, firstweek
    ofyear]])
  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 [, G
    roupDigit]]]])
  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 [, Gro
    upDigit]]]])
  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 10
    0 )。 (%)
  SYNTAX: FormatPercent(Expression [, Digit [, LeadingDigit [, Paren [, Gr
    oupDigit]]]])
  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 strSearc
    hFor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: < %
       st rTest = "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 (o
    ptional) is a boolean value used to display month abbreviation. True will di
    splay the abbreviated month name and False (default) will not show the abbre
    viation.
  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 repl
    aced 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-strin
    g to be replaced; strSearchFor is the string expression to search for within
    strToBeSearched; strReplaceWith is the string expression to replace sub-str
    ing strSearchFor; start (optional) is the numeric character position to begi
    n 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 Roun
    d 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:
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

 

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