<div id="seasonslist2"><p><button onclick="makeSeasonsList(); return false;" type="submit">Click to append list of seasons</button></p>
</div>

In script element within head element (<script type="text/javascript">):

function makeSeasonsList() {
  ul_node = document.createElement("ul");
  var mydata= {"seasons":['Spring','Summer','Fall','Winter']}
;
  var seasons = mydata.seasons;
    for (i in mydata.seasons) {
      var mytext = i + " " + seasons[i];
      var text_node = document.createTextNode(mytext);
      var li_node = document.createElement("li");
      li_node.appendChild(text_node);
      ul_node.appendChild(li_node);
    };
    var container = document.getElementById("seasonslist2");
    container.appendChild(ul_node);
}