How to change field element attribute using JSOM?

Occasional Contributor

I want to create a JavaScript app that allows me to change the attribute of an field element for an existing column.  For example, I want to change 'Allow unlimited length in document libraries:' to Yes (true) for a document library field that has the type 'Multiple lines of text'.

 

I know how to use JavaScript to create fields.  I just want to know how to modify it.

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