HTMLCollection
NodeList(,)

document.querySelectorAll()Element(),
(),NodeList,HTMLCollection?

html:

<div id="parent">
    <div id="child">
        <p class="PElement">Hello

        <p class="PElement">JavaScript

    </div>
</div>

JavaScript:

var pEles = document.querySelectorAll(".PElement");
console.log(pEles);

,: