Does the asciidoc have a function like the Static variable in Java?

I want this function as below:

= Title
LY = liyan, and maybe grammar like
:LY: liyan
or other grammar to define the static string

== one
1. this is LY or {LY}
== two
2. this is LY/ {LY}
== three
3. this is LY /{LY}

and then I want the {LY} can dispaly as "liyan" in my pdf or html view.

has this function? or can do it in other way?

Welcome to the forums,

Attributes is what you are looking for:
http://asciidoctor.org/docs/user-manual/#attributes

Just note that Asciidoctor provides a set of pre-defined attributes that are used to setup some configurations (eg. `images` for images directory path).
So, make sure you don't use a name that already exists.

Also, you can set pass them as a command argument `asciidoctor -a LY=liyan document.adoc` if you want to set the value outside of the document. The Maven and Gradle plugins allow to set them in the build configuration.

I have got it, Thank you !

The attribute can be define by myself, it is very useful for me.