underscore template usage

gistfile1.txt

var tpl = _.template($("#template_errors").html(),{variable: 'items'});// define variable to retrive
var html = tpl(response.responseJSON); //pass datas to be loop
$("#js-form").prepend(html);

// template to use
<script type="text/template" id="template_errors">
<div class="error-list">
    <ul>
          <% _.each(items,function(item,key,arr) { %>
              <li>
                 <span><%= item %></span>
               </li>
           <% }); %>
    </ul>
</div>
</script>