ASP中的函数应用方法及应用举例(1)[英文]
1.Array() 
  FUNCTION: Returns a variant containing an array. 
  SYNTAX: Array(list) 
  ARGUMENTS: list is a comma-delimited list of values to add to the array. 
  EXAMPLE: <%
Dim myArray()
For i = 1 to 7
   Redim Preserve myArray(i)
   myArray(i) = WeekdayName(i)
Next
%>
  RESULT: Creates an Array contains 7 elements:
myArray("Sunday","Monday", ... ... "Saturday") 
------------------------------------- 
  

2. CInt() 
  FUNCTION: Returns an expression that has been converted to an Interget subtype. 
  SYNTAX: CInt(expression) 
  ARGUMENTS: expression is any valid expression 
  EXAMPLE: <%
f = "234"
response.write cINT(f) + 2
%> 
  RESULT: 236
Converts string "234" to mathematic value 234.
If f is empty (un-initialized variable), cINT() returns 0. 
------------------------------------- 
  

3. CreateObject() 
  FUNCTION: Creates and returns a reference to ActiveX automation object. 
  SYNTAX: CreateObject(objName) 
  ARGUMENTS: objName is any valid ActiveX automation object. 
  EXAMPLE: <%
Set con = Server.CreateObject("ADODB.Connection")
%> 
  RESULT:  
------------------------------------- 
  

4. CStr() 
  FUNCTION: Returns an expression that has been converted to a variant of subtype String. 
  SYNTAX: CStr(expression) 
  ARGUMENTS: expression is any valid expression 
  EXAMPLE: <%
s = 3 + 2
response.write "The result is: " & cStr(s)
%> 
  RESULT: Converts a mathematic value 5 to a string "5". 
------------------------------------- 
  

5. Date() 
  FUNCTION: Returns the current system date. 
  SYNTAX: Date() 
  ARGUMENTS: None. 
  EXAMPLE: <%=Date%> 
  RESULT: 8/4/99 
------------------------------------- 
  

6. DateAdd() 
  FUNCTION: Returns a date to which a specific time interval has been added. 
  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"; 
------------------------------------- 
  

7. DateDiff() 
  FUNCTION: Returns the number of intervals between two dates. 
  SYNTAX: DateDiff(timeinterval,date1,date2 [, firstdayofweek [, firstweekofyear]]) 
  ARGUMENTS: timeinterval is the time interval to add; date is a valid date expression; firstdayofweek and 
firstweekofyear are optional values to specify the first day of the week and first week of year. 
  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: There are 150 days to millenium from 8/4/99. 
------------------------------------- 
  

8. Day() 
  FUNCTION: Returns a whole number representing the day of the month. 
  SYNTAX: Day(date) 
  ARGUMENTS: date is any valid date expression. 
  EXAMPLE: <%=Day(#8/4/99#)%> 
  RESULT: 4 
------------------------------------- 
  

9. FormatCurrency() 
  FUNCTION: Returns an expression formatted as a currency value. 
  SYNTAX: FormatCurrency(Expression [, Digit [, LeadingDigit [, Paren [, GroupDigit]]]]) 
  ARGUMENTS: Expression is a valid numeric expression; Digit is an optional numeric value used to indicate 
number of digits to the right of the decimal point; LeadingDigit is an optional tristate value to display 
a leading zero; Paren is an optional tristate value used to display parentheses around negative values; 
and GroupDigit is an option tristate value used to display a number as specified in the group delimiter 
settings of the Control Panels regional settings. 
  EXAMPLE: <%=FormatCurrency(34.3456)%> 
  RESULT: $34.35 
------------------------------------- 
  

10. FormatDateTime() 
  FUNCTION: Returns an expression formatted as a date or time. 
  SYNTAX: FormatDateTime(Date, [, NamedFormat]) 
  ARGUMENTS: Date is any valid date expression, and NamedFormat is an optional date/time constant. 
  EXAMPLE: <%=FormatDateTime("08/4/99", vbLongDate)%> 
  RESULT: Wednesday, August 04, 1999 
------------------------------------- 
  

10. FormatNumber() 
  FUNCTION: Returns an expression formatted as a number. 
  SYNTAX: FormatNumber(Expression [, Digit [, LeadingDigit [, Paren [, GroupDigit]]]]) 
  ARGUMENTS: Expression is a valid numeric expression; Digit is an optional numeric value used to indicate 
number of digits to the right of the decimal point; LeadingDigit is an optional tristate value to display 
a leading zero; Paren is an optional tristate value used to display parentheses around negative values; 
and GroupDigit is an option tristate value used to display a number as specified in the group delimiter 
settings of the Control Panels regional settings. 
  EXAMPLE: <%=FormatNumber(45.324567, 3)%> 
  RESULT: 45.325 
------------------------------------- 
  

11. FormatPercent() 
  FUNCTION: Returns an expression formatted as a percent value with a trailing percent (%) 
  SYNTAX: FormatPercent(Expression [, Digit [, LeadingDigit [, Paren [, GroupDigit]]]]) 
  ARGUMENTS: Expression is a valid numeric expression; Digit is an optional numeric value used to indicate 
number of digits to the right of the decimal point; LeadingDigit is an optional tristate value to display 
a leading zero; Paren is an optional tristate value used to display parentheses around negative values; 
and GroupDigit is an option tristate value used to display a number as specified in the group delimiter 
settings of the Control Panels regional settings. 
  EXAMPLE: <%=FormatPercent(0.45267, 3)%> 
  RESULT: 45.267% 
------------------------------------- 
  

12. Hour() 
  FUNCTION: Returns a whole number representing the hour of the day between 0 and 23. 
  SYNTAX: Hour(time) 
  ARGUMENTS: time is any valid date/time expression. 
  EXAMPLE: <%=Hour(#4:45:34 PM#)%> 
  RESULT: 16
(Hour has been converted to 24-hour system) 
------------------------------------- 
  

13. Instr() 
  FUNCTION: Returns the numeric position of the first instance of one string within another. 
  SYNTAX: Instr([start, ] strToBeSearched, strSearchFor [, compare]) 
  ARGUMENTS: start (optional) is the numeric position to start the string search; strToBeSearched is the 
string expression to be searched; strSearchFor is the string expression search value; and compare 
(optional) is the value indicating the comparison constant. 
  EXAMPLE: <%
strText = "This is a test!!"
pos = Instr(strText, "a")
response.write pos
%> 
  RESULT: 9
(string "a" is the 9th character in strText) 
------------------------------------- 
  

14. InstrRev() 
  FUNCTION: Returns the numeric position of one string within another starting from the end of the string. 
  SYNTAX: InstrRev([start, ] strToBeSearched, strSearchFor [, compare]) 
  ARGUMENTS: start (optional) is the numeric position to start the string search; strToBeSearched is the 
string expression to be searched; strSearchFor is the string expression search value; and compare 
(optional) is the value indicating the comparison constant. 
  EXAMPLE: <%
strText = "This is a test!!"
pos = InstrRev(strText, "s")
response.write pos
%> 
  RESULT: 13
(string "s" is the 13th character of strText if you search from the end of the strText) 
------------------------------------- 
  

15. Int() 
  FUNCTION: Returns the integer portion of a number 
  SYNTAX: Int(number) 
  ARGUMENTS: number is any valid numeric expression. 
  EXAMPLE: <%=INT(32.89)%> 
  RESULT: 32
(If cINT() is used instead, the result will be 33) 
  

------------------------------------- 
16. IsArray() 
  FUNCTION: Returns a boolean value indicating whether a variable is an array. 
  SYNTAX: IsArray(name) 
  ARGUMENTS: name is the variable to be determined. 
  EXAMPLE: <%
strTest = "Test!"
response.write IsArray(strTest)
%> 
  RESULT: False 
------------------------------------- 

17. IsDate() 
  FUNCTION: Returns a boolean value indicating whether the expression can be converted to a date. 
  SYNTAX: IsDate(expression) 
  ARGUMENTS: expression is any valid expression. 
  EXAMPLE: <%
strTest = "8/4/99"
response.write IsDate(strTest)
%> 
  RESULT: True 
------------------------------------- 
  

18. IsEmpty() 
  FUNCTION: Returns a boolean value indicating whether a variable has been initialized. 
  SYNTAX: IsEmpty(expression) 
  ARGUMENTS: expression is any valid expression. 
  EXAMPLE: <%
Dim i
response.write IsEmpty(i)
%> 
  RESULT: True 
------------------------------------- 
  

19. IsNull() 
  FUNCTION: Returns a boolean value that indicates whether an expression contains no valid datatype. 
  SYNTAX: IsNull(expression) 
  ARGUMENTS: expression is any valid expression. 
  EXAMPLE: <%
Dim i
response.write IsNull(i)
%> 
  RESULT: False 
------------------------------------- 
  

20. IsNumeric() 
  FUNCTION: Returns a boolean value indicating whether an expression can be evaluated as a number. 
  SYNTAX: IsNumeric(expression) 
  ARGUMENTS: expression is any valid expression. 
  EXAMPLE: <%
i = "345"
response.write IsNumeric(i)
%> 
  RESULT: True
(Even if there are quotation marks around 345, which indicates datatype of string, IsNumeric() function 
will still try to convert a string to numeric value first) 
------------------------------------- 

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