Asp常用函数

  • 作者:未知 来源:未知 添加时间:2003年3月13日 字体:

  • 长了点,但是很有用!



    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,注意取值是不大于它的整数。

     SYNTAX: Int(number)

     ARGUMENTS: 

     EXAMPLE: <%=INT(32.89)%>  <%=int(-3.33)%>

     RESULT: 32  -4

     

    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 &#118alue 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 &#118alue 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

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