#NoEnv                          ;- Recommended for performance and compatibility with future AutoHotkey releases.
#Warn                           ;- Enable warnings to assist with detecting common errors.
SendMode Input                  ;- Recommended for new scripts due to its superior speed and reliability.
SetWorkingDir %A_ScriptDir%     ;- Ensures a consistent starting directory.
;-------------------------------
e=
(Ltrim join`r`n
https://www.youtube.com/watch?v=iR0w0mWB3uA - 李香蘭 Li Xiang Lan 1920 － 2014
https://www.youtube.com/watch?v=NklP8BDourg - Suo Luo He Zhi Lian
https://www.youtube.com/watch?v=EFSZnC3-E4A - Lilian de Celis - El Relicario
https://www.youtube.com/watch?v=Fs8cYa1Z2Tk - 春風吻上我的臉 - 姚莉 / 鍾情
)
Arr:=StrSplit(e,"`n")
tot:=arr.maxindex(),a1:=arr[1],a2:=arr[2],a3:=arr[3],a4:=arr[4]
msgbox,Total=%tot%`n%a1%`n%a2%`n%a3%`n%a4%`n`nRun A4= > 春風吻上我的臉 - 姚莉 / 鍾情
try,
 run,%a4%
return
;=======================================================

array example
[code]#NoEnv ;- Recommended for performance and compatibility with future AutoHotkey releases.
#Warn ;- Enable warnings to assist with detecting common errors.
SendMode Input ;- Recommended for new scripts due to its superior speed and reliability.
SetWorkingDir %A_ScriptDir% ;- Ensures a consistent starting directory.
;-------------------------------
e=
(Ltrim join`r`n
https://www.youtube.com/watch?v=iR0w0mWB3uA - 李香蘭 Li Xiang Lan 1920 － 2014
https://www.youtube.com/watch?v=NklP8BDourg - Suo Luo He Zhi Lian
https://www.youtube.com/watch?v=EFSZnC3-E4A - Lilian de Celis - El Relicario
https://www.youtube.com/watch?v=Fs8cYa1Z2Tk - 春風吻上我的臉 - 姚莉 / 鍾情
)
Arr:=StrSplit(e,"`n")
tot:=arr.maxindex(),a1:=arr[1],a2:=arr[2],a3:=arr[3],a4:=arr[4]
msgbox,Total=%tot%`n%a1%`n%a2%`n%a3%`n%a4%`n`nRun A4= > 春風吻上我的臉 - 姚莉 / 鍾情
try,
run,%a4%
return
;=======================================================[/code]

比如变量a的值是字符串"Array1"，怎么据此定义一个数组【Array1】？
a := "Array1"
【Array1】 := []
================================================================
上面的提问是没有意义的，只是因为我对控件的命名和引用没理解。
快速参考有提到：V: 设置控件的名称. 在字母 V 后指定一个名称, V 不包含在名称中. 例如, 指定 vMyEdit 会将控件命名为 "MyEdit".
可以用MyGui["MyEdit"]来引用该控件，这样是可以用表达式来命名不同的控件，之前我只知道MyEdit:=MyGui.Add("Edit")这种写法，然后用固定的名称"MyEdit"来引用该控件。