With this code, I get all the selectors and add a style to it on click.How add style to child element, which parent class childNodes was not clicked
let openSelect = document.querySelectorAll(".multiselect");
openSelect.forEach((item) => {
item.addEventListener("click", (e) => {
item.childNodes.item(3).style.display = "block";
});
});
<div class="multiselect"><a></a> <a></a> <a>2</a></div>
<div class="multiselect"><a></a><a></a><a>3</a></div>
document.addEventListener("click", (event) => {
openSelect.forEach((item) => {
if(!item.contains(event.target)) {
item.childNodes.item(3).style.display = "none";
}
});
});