FOR DO语句中的局部变量 [英] Local variable in FOR DO Statement

问题描述

变量'var'在显示其值之前是否被销毁?

does the variable 'var' gets destroyed before displaying its value?

@echo off
FOR /f "tokens=* delims=" %%G IN ('dir') DO (
set var=%%G
echo %var%
)

推荐答案

由于解析循环体时解析了对％var％的引用，因此该方法永远不会起作用.您必须启用延迟的变量扩展，并改用！var！:

This will never work since the reference to %var% is resolved when the body of the loop is parsed. You have to enable delayed variable expansion and use !var! instead:

@ECHO OFF
SETLOCAL EnableDelayedExpansion
FOR /F "tokens=* delims= " %%G IN ('dir') DO (
    SET VAR=%%G
    ECHO !VAR!
)
ENDLOCAL

您可以通过在命令行中键入 SET/?来阅读全部内容；-)

You can read all about it by type SET /? at a command line ;-)

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