Edit in JSFiddle

Array.prototype.forEach.call(document.getElementsByTagName("div"), function(div){
    div.innerHTML = "Hola mundo"; 
});

<div></div>
<div></div>
<div></div>
<div></div>

div{
    text-align: center;
    width: 10em;
}

div:nth-child(even){
    background: yellow;
}

div:nth-child(odd){
    background: lightgreen;
}