document.getElementsByClassName("active")
//HTMLCollection [div.active]
document.getElementsByClassName("active").forEach() X
document.querySelectorAll(".active")
//NodeList [div.active]
document.querySelectorAll(".active").forEach() O
document.querySelectorAll(".active").map() X
Array.from( document.getElementsByClassName("active") )
//(2) [div.active, div.active]
Array.from( document.getElementsByClassName("active") ).map(ele=>ele.innerHTML)
//(2) ['사과', '바나나']-
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