ASP中的函数应用方法及应用举例(2)[英文]
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#)%> 
  RESULT: 1999 
-------------------------------------(完)

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