Option Explicit 语句
Specifies that every variable in the program code must be explicitly declared with the Dim statement.
The Option Explicit statement is evaluated at run time.
Option Explicit
Option Explicit
Sub ExampleExplicit
Dim sVar As String
sVar = "Las Vegas"
For i% = 1 To 10 ' 将导致运行时错误
Rem
Next i%
End Sub