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每日一囧
本文提供大家分享學(xué)習(xí)的是利用ASP對參數(shù)是否為空的判斷,然而輸入的參數(shù)類型不同,判斷的方法也就會(huì)不一樣了,那么如何正確的判斷參數(shù)是否為空呢,接下來讓我們一起學(xué)習(xí)一下吧。
具體的請看下文所示:
<%
'Check a variable isn't "empty"
Function IsBlank(ByRef TempVar)
'by default, assume it's not blank
IsBlank = False
'now check by variable type
Select Case VarType(TempVar)
'Empty & Null
Case 0, 1
IsBlank = True
'String
Case 8
If Len(TempVar) = 0 Then
IsBlank = True
End If
'Object
Case 9
tmpType = TypeName(TempVar)
If (tmpType = "Nothing") Or (tmpType = "Empty") Then
IsBlank = True
End If
'Array
Case 8192, 8204, 8209
'does it have at least one element?
If UBound(TempVar) = -1 Then
IsBlank = True
End If
End Select
End Function
%>
Example Usage
<%
If IsBlank(Session("username"))Then
response.redirect("LoginFail.htm")
End If
%>
<%
'Check a variable isn't "empty"
Function IsBlank(ByRef TempVar)
'by default, assume it's not blank
IsBlank = False
'now check by variable type
Select Case VarType(TempVar)
'Empty & Null
Case 0, 1
IsBlank = True
'String
Case 8
If Len(TempVar) = 0 Then
IsBlank = True
End If
'Object
Case 9
tmpType = TypeName(TempVar)
If (tmpType = "Nothing") Or (tmpType = "Empty") Then
IsBlank = True
End If
'Array
Case 8192, 8204, 8209
'does it have at least one element?
If UBound(TempVar) = -1 Then
IsBlank = True
End If
End Select
End Function
%>
Example Usage
<%
If IsBlank(Session("username"))Then
response.redirect("LoginFail.htm")
End If
%>
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