在函数外部未定义变量

Question

在函数外未定义变量@set "VAR=Value" rem // No spaces behind `X`, one in front -- returns `VAR=Value`!? set VAR X rem // No spaces behind `X`, two in front -- returns an ERROR! set VAR X rem // No spaces behind `X`, one in front -- returns `VAR=Value`!? set "VAR X" rem // No spaces behind `X`, two in front -- returns an ERROR! set "VAR X" 。我想知道如何定义它。

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