How to get where onclick function is called javascript

Can anybody give me the syntax on how could I determine where the onclick event was called. I want to change the h4 content depending on where the onclick came from ex. if label() is called in "woven badges" , h4 innerhtml will be "woven badges" if label() is called in "woven tapes" , h4 innerhtml will be "woven tapes" i want to incorporate this into just one function and not to actually create one function per category which im currently doing with my javascript below. how can create it into if conditions? function label() { document.getElementsByTagName("h4")[0].innerHTML="badges";}

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