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看楼主修改代码，目标行存在唯一关键词的话，这样也行

@echo off
set "file=a.js"
set "user_pref("mail.server.server1.directory"=user_pref("mail.server.server1.directory", "D:\\存档");"
set "user_pref("mail.server.server1.directory-rel"=user_pref("mail.server.server1.directory-rel", "[ProfD]../../../../../存档");"
for /f "usebackq delims=" %%i in ("%file%") do (
     set "line=%%i"
     setlocal enabledelayedexpansion
     for /f "delims=," %%a in ("%%i") do if defined %%a set "line=!%%a! "
     echo !line!
     endlocal
)
pause
复制代码