三、AppleScript的循环与逻辑分支

条件语句

if true then
    -- do something
end if 

if false then
    -- do something
end if 

例:

set a to 20
set b to 30

if a = b then
    set c to 10
else
    set c to 20
end if

image.png

如何判断是否为“真”（true）

• 数的比较运算符

= is (or, is equal to) 等于
> is greater than 大于
< is greater than 小于
>= is greater than or equal to 大于等于
<= is less than or equal to 小于等于

并支持反义符号，如不大于，is not greater than。不等于 /= 或 is not

• 字符串的比较运算符

begins with (or, starts with)  以……开头
ends with                    以……结尾
is equal to                  一致
comes before                 在……之前
comes after                  在……之前
is in                       在……之中
contains                     包含

• 反义运算符

does not start with 不以……开头
does not contain    不以……结尾
is not in          不在……之内
等等。

• 比较运算符 "comes before" 和 "comes after" 对字符串逐字母比较，区分大小写

if "Jack" comes after "Rose" then
    set a to 123
else
    set a to 456
end if

image.png

• 忽略空格

set stringA to "Ja c k"
set stringB to "Jack"
ignoring white space
    if stringA = stringB then beep
end ignoring

• 列表的比较运算符

begins with 以……开头
ends with   以……结尾
is equal to 一致
is in       在……之中
contains    包含

例子

set listA to {"a", "b", "c"}
if "a" is in listA then
    set c to 123
else
    set c to 456
end if

image.png

• 记录的比较运算符

is equal to(也可以使用 =)    一致
contains                  包含

set recordA to {name:"Jack", age:20}
-- name of recordA is "Jack"
if recordA contains {name:"Jack"} then
    set c to 123
end if

image.png

布尔数据的 与、或、非

• and

set x to true
set y to true
set z to (x and y)

image.png

• or

set x to true
set y to false
set z to (x or y)

image.png

• not

set x to not true
set y to false
if x = y then
    set z to 123
end if

image.png

循环

• repeat 重复 重复次数必须是整数，例

set repetitions to 2
-- repeat 2 times
repeat repetitions times
    say "Hello world!"
end repeat

• 满足条件后重复执行下一步

set isRun to false
-- until 与 while 判断结果相反
repeat while isRun is false
    say isRun
end repeat

• 从1读到5，步长默认为1

repeat with i from 1 to 5
    say i
end repeat

• by 2 设置步长为2，如下

repeat with i from 1 to 5 by 2
    say i
end repeat

repeat with aItem in itemList
end repeat

跳出循环, exit repeat相当于break