自动构建投资组合的autoit代码

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dim $system="st"

dim $length=10
dim $sleeptime=500;

dim $instruments[$length]=["if","ru","cu","rb","au","ag","j","y","sr","ta"]
dim $contracts[$length]=["if888","ru888","cu888","rb888","au888","ag888","j9888","y9888","sr888","ta888"]

winactivate("交易开拓者平台(旗舰版)")  

for $i=0 to $length-1
   send("^n")
   winwait("新建")
   send("{end}")
   send("{enter}")
   winwait("交易开拓者平台(旗舰版) - [")
   send($contracts[$i])
   winwait("我的键盘")   
   send("{enter}")           
   WinWait("我的键盘")
   send($system)
   send("{enter}")
   send("^s")
   winwait("Save As")
   sleep($sleeptime)
   send($instruments[$i]&"_"&$system)
   send("!s")
   sleep($sleeptime)
   if winexists("Confirm Save As") then       
          send("!y")
   endif  
next

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有什么用？怎么用？