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True or False,明明白白你的If语句流程
编辑:dnawo 日期:2007-10-05

If condition Then
[statements1]
Else
[statements2]
End If
[statements1]
Else
[statements2]
End If
上边是VBScript脚本If语句的语法,当condition值为True时执行statements1,当condition值为False时执行statements2,由于VBScript的类型自动转换功能,当condition的值为非0的数值时和True等效,当condition的值为0时和False等效。
实际运用中,我们必须对condition的值有充分的认识,才能对If语句的流程胸有成足。下边我们再举一些例子来加深记忆:
复制内容到剪贴板
程序代码

<%
Dim condition
condition = Response.IsClientConnected
If condition Then
Response.write("True")
Else
Response.write("False")
End If
'condition = True , Result:True
'condition = False , Result:False
'condition = 2 , Result:True
'condition = 0.01 , Result:True
'condition = 0 , Result:False
'condition = 0.00 , Result:False
'condition = isNumeric(3) , Result:True
'condition = isNumeric("aa") , Result:False
'condition = Array(0,1,"aa","bb")(0) , Result:False
'condition = Array(0,1,"aa","bb")(1) , Result:True
'condition = Response.IsClientConnected , Result:True
%>
Dim condition
condition = Response.IsClientConnected
If condition Then
Response.write("True")
Else
Response.write("False")
End If
'condition = True , Result:True
'condition = False , Result:False
'condition = 2 , Result:True
'condition = 0.01 , Result:True
'condition = 0 , Result:False
'condition = 0.00 , Result:False
'condition = isNumeric(3) , Result:True
'condition = isNumeric("aa") , Result:False
'condition = Array(0,1,"aa","bb")(0) , Result:False
'condition = Array(0,1,"aa","bb")(1) , Result:True
'condition = Response.IsClientConnected , Result:True
%>
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