I need javascript code to change a lot items type?

edited July 13, 2019
Because I am new with zotero, and I have manually library in folders and sub folders, and I add a lot of PDFs as link files.
And it's need hard work to add items description , I read in help , there a way to change some description using javascript , I am try and I made some update.

Now

I hope to get javascript code to change a lot items type once time?
for example select many items and change it's type to 'book'... etc.
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