Auto increment numbers in div id javascript

Question

can somebody please help me? How to add auto increment number in div ID using javascript? I have four divs and I\'d like to have them automatically numbered (box1, box2, box

Answer 1

set id property

var list = document.getElementsByClassName("something");
for (var i = 0; i < list.length; i++) {
    list[i].id = "box" + (i + 1);
}