检查变量是否为数字:Applescript [英] Check if variable is number: Applescript

问题描述

如何检查变量是否为数字?

How can I check if a variable is a number?

我正在尝试:

set a to 5
if a is a number
display dialog "Yes! It's a number!"
end if

我也试过这个代码:

set a to 5
if a is integer
display dialog "Yes! It's a number!"
end if

但不幸的是它没有按预期工作.

But unfortunately it doesn't work as expected.

推荐答案

class of a is integer 如果使用会失败

class of a is integer will fail if you use

set a to "5"

即使变量是数字但作为文本输入，这也会起作用.

This will work if even if the variable is a number but was entered as text.

set a to "5"
try
    set a to a as number
    display dialog "Yes! It's a number!"
end try

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