ASP中的函数应用方法及应用举例(二)
发表日期：2000-8-25
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21. IsObject()
FUNCTION: Returns a boolean value indicating whether an exPRession refers to an automation object.
SYNTAX: IsObject(expression)
ARGUMENTS: expression is any valid expression.
EXAMPLE: <%
Set con = Server.CreateObject("ADODB.Connection")
response.write IsObject(con)
%>
RESULT: True
-------------------------------------
22. LBound()
FUNCTION: Returns the base index value for a dimension of any array.
SYNTAX: Lbound(arrayname [, dimension])
ARGUMENTS: arrayname is the name of any array; dimension is an optional number indicating the dimension
to find the lower bound.
EXAMPLE: <%
i = Array("Monday","Tuesday","Wednesday")
response.write LBound(i)
%>
RESULT: 0
-------------------------------------
23. LCase()
FUNCTION: Returns a string that has been converted into lowercase characters.
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!
-------------------------------------
24. Left()
FUNCTION: Returns the number of characters from the left side of a string.
SYNTAX: Left(string, length)
ARGUMENTS: string is any valid string expression; length is the length of characters to return.
EXAMPLE: <%
strTest = "This is a test!"
response.write Left(strTest, 3)
%>
RESULT: Thi
-------------------------------------
25. Len()
FUNCTION: Returns the number of characters in a string or the number of bytes required to store a
variable.
SYNTAX: Len(string | varName)
ARGUMENTS: string is any valid string expression; varName is any valid variable name.
EXAMPLE: <%
strTest = "This is a test!"
response.write Len(strTest)
%>
RESULT: 15
(The total length of strTest is 15 characters)
26.
LTrim()
FUNCTION: Returns a string without leading spaces.
SYNTAX: LTrim(string)
ARGUMENTS: string is any valid string expression.
EXAMPLE: <%
strTest = " This is a test!"
response.write LTrim(strTest)
%>
RESULT: This is a test!
-------------------------------------
27. Mid()
FUNCTION: Returns a specified number of characters from a string.
SYNTAX: Mid(string, start [, length])
ARGUMENTS: string is any valid string expression; start is a numeric character position to begin
extraction from; length (optional) is the number of characters to return.
EXAMPLE: <%
strTest = "This is a test! Today is Monday."
response.write Mid(strTest, 17, 5)
%>
RESULT: Today
-------------------------------------
28. Minute()
FUNCTION: Returns the number of the minutes in current system time.
SYNTAX: Minute(time)
ARGUMENTS: time is any valid time expression.
EXAMPLE: <%=Minute(#12:45:32 PM#)%>
RESULT: 45
-------------------------------------
29. Month()
FUNCTION: Returns the number of the month of the year.
SYNTAX: Month(date)
ARGUMENTS: date is any valid date expression.
EXAMPLE: <%=Month(#08/04/99#)%>
RESULT: 8
-------------------------------------
30. 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
-------------------------------------
31. Now()
FUNCTION: Returns the current system date and time.
SYNTAX: Now()
ARGUMENTS: None
EXAMPLE: <%=Now%>
RESULT: 8/4/99 9:30:16 AM
-------------------------------------
32. 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!
-------------------------------------
33. Right()
FUNCTION: Returns a specified number of characters from the right side of a string.
SYNTAX: Right(string, length)
ARGUMENTS: string is any valid string expression; length is any valid numeric expression representing
the number of characters to return.
EXAMPLE: <%
strTest = "This is an test!"
response.write Right(strTest, 3)
%>
RESULT: st!
-------------------------------------
34. Rnd()
FUNCTION: Returns a random number.
SYNTAX: Rnd [ (number) ]
ARGUMENTS: number is any valid numeric expression.
EXAMPLE: <%
Randomize()
response.write RND()
%>
RESULT: Any number between 0 and 1
(Without Randomize(), the number will not re-generate)
Round()
FUNCTION: Returns a number rounded to a specified number of decimal places.
SYNTAX: Round(expression [, numRight])
ARGUMENTS: expression is any valid numeric expression to be rounded; numRight (optional) is any numeric
expression used to indicate the number of digits to the right of the decimal point.
EXAMPLE: <%
i = 32.45678
response.write Round(i)
%>
RESULT: 32
-------------------------------------
35. Rtrim()
FUNCTION: Returns a copy of a string without trailing spaces.
SYNTAX: Rtrim(string)
ARGUMENTS: string is any valid string expression.
EXAMPLE: <%
strTest = "This is a test!! "
response.write RTrim(strTest)
%>
RESULT: This is a test!!
-------------------------------------
36. Second()
FUNCTION: Returns the current seconds value of the current system time.
SYNTAX: Second(time)
ARGUMENTS: time is any valid time expression.
EXAMPLE: <%=Second(#12:34:28 PM#)%>
RESULT: 28
-------------------------------------
37. StrReverse()
FUNCTION: Returns a string where the character order has been reversed
SYNTAX: StrReverse(string)
ARGUMENTS: string is any valid string expression
EXAMPLE: <%
strTest = "This is a test!!"
response.write StrReverse(strTest)
%>
RESULT: !!tset a si sihT
-------------------------------------
38. Time()
FUNCTION: Returns the current system time.
SYNTAX: Time()
ARGUMENTS: None.
EXAMPLE: <%=Time%>
RESULT: 9:58:28 AM
-------------------------------------
39. Trim()
FUNCTION: Returns a string without leading and trailing spaces.
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!!
-------------------------------------
40. UBound()
FUNCTION: Returns the largest available subscipt for a dimension of an array.
SYNTAX: Ubound(arrayname [, dimension])
ARGUMENTS: arrayname is the name of a valid array; dimension (optional) is a number indicating the
dimension to find the upper bound.
EXAMPLE: <%
i = Array("Monday","Tuesday","Wednesday")
response.write UBound(i)
%>
RESULT: 2
(array index starts with 0)
-------------------------------------
41. UCase()
FUNCTION: Returns a string that has been converted to uppercase characters.
SYNTAX: UCase(string)
ARGUMENTS: string is any valid string expression.
EXAMPLE: <%
strTest = "This is a test!!"
response.write UCase(strTest)
%>
RESULT: THIS IS A TEST!!
-------------------------------------
42. VarType()
FUNCTION: Returns the subtype of a variable
SYNTAX: VarType(varName)
ARGUMENTS: varName is the required variable name
EXAMPLE: <%
i = 3
response.write varType(i)
%>
RESULT: 2
(2 indicates Integer. Refers to asp Constants)
-------------------------------------
43. WeekDay()
FUNCTION: Returns a whole number representing the day of the week.
SYNTAX: WeekDay(date [, firstdayofweek])
ARGUMENTS: date is any valid date expression; firstdayofweek is an optional date constant to assign the
first day of week.
EXAMPLE: <%
d = #8/4/99#
response.write Weekday(d)
%>
RESULT: 4
(4 indicates the fourth of the week, which is Wednesday)
-------------------------------------
44. WeekDayName()
FUNCTION: Returns the specified day of the week.
SYNTAX: WeekDayName(weekday [, Abb [, firstdayofweek]])
ARGUMENTS: weekday is the numeric representation for the day of the week; Abb is an optional boolean
value (if set to true, the weekday name will be abbreviated; if set to false, the full weekday name is
displayed); and firstdayofweek is an optional date constant to assign the first day of week.
EXAMPLE: <%
d = #8/4/99#
response.write WeekdayName(Weekday(d))
%>
RESULT: Wednesday
-------------------------------------
45. Year()
FUNCTION: Returns the current year.
SYNTAX: Year(date)
ARGUMENTS: date is any valid date expression.
EXAMPLE: <%=Year(#8/4/99#)%>
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