批處理中變量延遲及管道符怎么使用見圖或下面拷屏，涉及變量延緩及管道的問題，實在想不明白，請高手指點，謝謝。===============================C:>more b.bat@Echo Off & Setlocal Enabledelayedexpansion & setlocal EnableExtensionsset a=HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindows NTCurrentVersionNetworkCards11set b=ServiceName REG_SZ{4A966A11-AE30-4187-B6D1-7C02987D}set c=Description REG_SZRealtek RTL8139/810x Family Fast Ethernet NIC@echo !a! ^| findstr /C:Realtek RTL8139/810x Family Fast Ethernet NIC >nul&& echo YES || echo NO@echo !b! ^| findstr /C:Realtek RTL8139/810x Family Fast Ethernet NIC >nul&& echo YES || echo NO@echo !c! ^| findstr /C:Realtek RTL8139/810x Family Fast Ethernet NIC >nul&& echo YES || echo NOC:>b.batYESYESYESC:>@echo HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindows NTCurrentVersionNetworkCards11 | findstr /C:Realtek RTL8139/810x Family Fast Ethernet NIC >nul && echo YES || echo NONOC:>@echo ServiceName REG_SZ{4A966A11-AE30-4187-B6D1-7C02987D} | findstr /C:Realtek RTL8139/810x Family Fast Ethernet NIC >nul && echo YES || echo NONOC:>@echo Description REG_SZRealtek RTL8139/810x Family Fast Ethernet NIC | findstr /C:Realtek RTL8139/810x Family Fast Ethernet NIC >nul && echo YES || echo NOYES