全局变量给出错误“变量.未定义”。编号-2753

Question

我有这样的代码：

global logFilePath

Job("/Volumes/Work/test.log")

on Job(logFilePath)
  -- more code
  vlog("text")
  -- more code
end Job

on vlog(x)
   do shell script "echo \"" & (do shell script "date +' %H:%M:%S '") & x & "\" >> " & quoted form of logFilePath
end vlog

我一直从error "The variable logFilePath is not defined." number -2753 from "logFilePath"块中获取on vlog。

为什么？我不是宣布它是全球性的吗？

这是可行的，但不那么优雅：

global logFilePath, logFilePath2

Job("/Volumes/Work/test.log")

on Job(logFilePath)
  set logFilePath2 to logFilePath
  -- more code
  vlog("text")
  -- more code
end Job

on vlog(x)
   do shell script "echo \"" & (do shell script "date +' %H:%M:%S '") & x & "\" >> " & quoted form of logFilePath2
end vlog

Answer 1

处理程序中的本地变量logFilePath

 on Job(logFilePath)

并不是与同名的全局变量相同的对象，因此实际上没有定义它。

要清楚地使用不同的名称

global logFilePath

Job("/Volumes/Work/test.log")

on Job(localPath)
    set logFilePath to localPath
    -- more code
    vlog("text")
    -- more code
end Job

on vlog(x)
    do shell script "echo \"" & (do shell script "date +' %H:%M:%S '") & x & "\" >> " & quoted form of logFilePath
end vlog

或者只使用局部变量

Job("/Volumes/Work/test.log")

on Job(localPath)
    -- more code
    vlog("text", localPath)
    -- more code
end Job

on vlog(x, logFilePath)
    do shell script "echo \"" & (do shell script "date +' %H:%M:%S '") & x & "\" >> " & quoted form of logFilePath
end vlog