如何在DOM中分别选择这4个相同的元素？

var element1 = document.getElementById("element1");
var element2 = document.getElementById("element2");
var element3 = document.getElementById("element3");
var element4 = document.getElementById("element4");

var elements = document.getElementsByClassName("element");
var element1 = elements[0];
var element2 = elements[1];
var element3 = elements[2];
var element4 = elements[3];

var elements = document.querySelectorAll(".element");
var element1 = elements[0];
var element2 = elements[1];
var element3 = elements[2];
var element4 = elements[3];

var elements = document.getElementsByTagName("div");
var element1 = elements[0];
var element2 = elements[1];
var element3 = elements[2];
var element4 = elements[3];