Google says don’t use JavaScript to generate a noindex tag in the original page code

Google updated its JavaScript SEO basics documentation to clarify that may skip rendering and JavaScript execution.

Google Warns Noindex Can Block JavaScript From Running

Google updated its JavaScript SEO documentation to clarify that noindex tags may prevent rendering and JavaScript execution, ...
InfoWorld

User-defined variables in JavaScript

Variables hold a wide variety of information temporarily. The JavaScript data types that can be stored in a variable include: JavaScript variables can hold a few other kinds of data, but these are by ...