请帮我看看批处理代码为什么不输入东西直接确定会退出？

jorlaying

1. @echo off
   
2. :sc_gl
   
3. set /p "an=请拖入目标:"
   
4. for /f "tokens=1-2 delims=," %%a in ("%an%") do set "shl=%%a"
   
5. if /i "%shl%" =="c:" echo  禁止操作！&& pause>nul 2>nul && goto sc_gl
   
6. if /i "%shl%" =="c:" echo 禁止操作！&& pause>nul 2>nul && goto sc_gl
   
7. echo %shl%
   
8. goto sc_gl
   
9. pause

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