console.clear();

​

function sort() {

  var nodeList = document.querySelectorAll('li');

  var itemsArray = [];

  var parent = nodeList[0].parentNode;

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

    itemsArray.push(parent.removeChild(nodeList[i]));

  }

  itemsArray.sort(function(nodeA, nodeB) {

      var textA = nodeA.querySelector('div:nth-child(2)').textContent;

      var textB = nodeB.querySelector('div:nth-child(2)').textContent;

      var numberA = parseInt(textA);

      var numberB = parseInt(textB);

      if (numberA < numberB) return -1;

      if (numberA > numberB) return 1;

      return 0;

    })

    .forEach(function(node) {

      parent.appendChild(node)

    });

}