IsNull函数来判断一个变量是否为空。如果变量不为空，则返回False；如果变量为空，则返回True。，，``asp，Dim myVar，myVar = "Hello, World!"，If IsNull(myVar) Then， Response.Write("Variable is empty")，Else， Response.Write("Variable is not empty")，End If，``IsNull函数来判断一个变量是否为空。如果变量不为空，则返回False；如果变量为空，则返回True。，，``asp，Dim myVar，myVar = "Hello, World!"，If IsNull(myVar) Then， Response.Write("Variable is empty")，Else， Response.Write("Variable is not empty")，End If，``Powered By Z-BlogPHP 1.7.3
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