var anchors = document.querySelectorAll('ul li a');

console.log(anchors);

​

for (var i=0; i<anchors.length; ++i) {

  anchors[i].addEventListener('click', addList);

}

​

function addList(e) {

  var li = document.createElement('li');

  var a = document.createElement('a');

  a.href = '#';

  a.textContent = 'new item';

  a.addEventListener('click', addList);

  li.appendChild(a);

  e.target.parentNode.insertBefore(li, e.target.nextSibling);

}