Edit in JSFiddle

var list = document.getElementsByTagName('li');
var output = document.getElementById('out');
var i, len = list.length;

for (i = 0; i < len; i++) {
  out.innerHTML += "<p>";
  out.innerHTML += list[i].innerHTML;
  out.innerHTML += " : ";
  out.innerHTML += list[i].hasAttributes(); // 요소가 속성을 가지고 있다면 true
  out.innerHTML += "</p>";
}

<ul>
  <li class="myClass">item 1</li>
  <li>item 2</li>
  <li style="color:red">item 3</li>
  <li>item 4</li>
</ul>
<div id="out"></div>