[数值计算] 批处理延迟环境变量扩容和直接变量扩容有什么区别？

if not exist a.txt (
set result=lol
echo result is %result%
pause
)
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@Echo Off&SetLocal EnableDelayedExpansion
Set Var=before
if "%Var%" == "before" (
Set Var=after
if "!Var!" == "after" echo If you see this, it worked
)
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@echo off
    set VAR=before
    if "%VAR%" == "before" (
        set VAR=after
        if "%VAR%" == "after" @echo If you see this, it worked
    )
pause
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   if "%VAR%" == "before" (
        set VAR=after
        if "%VAR%" == "after" @echo If you see this, it worked
    )
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实际上是在比较 "before" 和
"after"，这两者永远不会相等。
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Option Explicit

Private Sub Command1_Click()
    Dim a
    a = 1
    If a = 1 Then
        a = 2
        MsgBox a
    End If
End Sub
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