adding an extra attribute inside html tag through javascript

assume we have a set of html tags like
I am trying to add an extra attribute in to the div tag like `key='post'` from the array `[post, get, search]` for each tags respectively. Is it possible to do that using javascript?? I would also like to knw what if the input was hash instead of array like {"post" : ["0","1"], "get": ["0","2"], "search": ["2","1"]}

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