我希望为javascript选择的元素显示在底部。我该怎么做？

Question

当我选择一个选项时，我希望它位于列表的底部 我想通过拖动元素来替换已选中和未选中的

我想在元素的开头添加一个复选框，并想将添加的元素添加到列表的开头

我该怎么办？

var close = document.getElementsByClassName("close");
var i;
for (i = 0; i < close.length; i++) {
  close[i].onclick = function() {
    var div = this.parentElement;
    div.style.display = "none";
  }
}


var remove = document.querySelector('.draggable');

function dragStart(e) {
  this.style.opacity = '0.4';
  dragSrcEl = this;
  e.dataTransfer.effectAllowed = 'move';
  e.dataTransfer.setData('text/html', this.innerHTML);
};

function dragEnter(e) {
  this.classList.add('over');
}

function dragLeave(e) {
  e.stopPropagation();
  this.classList.remove('over');
}

function dragOver(e) {
  e.preventDefault();
  e.dataTransfer.dropEffect = 'move';
  return false;
}

function dragDrop(e) {
  if (dragSrcEl != this) {
    dragSrcEl.innerHTML = this.innerHTML;
    this.innerHTML = e.dataTransfer.getData('text/html');
  }
  return false;
}

function dragEnd(e) {
  var listItens = document.querySelectorAll('.draggable');
  [].forEach.call(listItens, function(item) {
    item.classList.remove('over');
  });
  this.style.opacity = '1';
}

function addEventsDragAndDrop(el) {
  el.addEventListener('dragstart', dragStart, false);
  el.addEventListener('dragenter', dragEnter, false);
  el.addEventListener('dragover', dragOver, false);
  el.addEventListener('dragleave', dragLeave, false);
  el.addEventListener('drop', dragDrop, false);
  el.addEventListener('dragend', dragEnd, false);
}

var listItens = document.querySelectorAll('.draggable');
[].forEach.call(listItens, function(item) {
  addEventsDragAndDrop(item);
});

var list = document.querySelector('ul');
list.addEventListener('click', function(ev) {
  if (ev.target.tagName === 'LI') {

    ev.target.classList.toggle('checked');
  }
}, false);



function newElement() {
  var li = document.createElement("li");

  var inputValue = document.getElementById("myInput").value;
  var t = document.createTextNode(inputValue);
  li.appendChild(t);
  if (inputValue === '') {
    alert("Boş bırakılamaz!");
  } else {
    document.getElementById("myUL").appendChild(li);
  }
  document.getElementById("myInput").value = "";
  var span = document.createElement("SPAN");
  var txt = document.createTextNode("\u00D7");
  span.className = "close";
  span.appendChild(txt);
  li.appendChild(span);
  for (i = 0; i < close.length; i++) {
    close[i].onclick = function() {
      var div = this.parentElement;
      div.style.display = "none";
    }

  }
  var attr = document.createAttribute('draggable');
  li.className = 'draggable';
  attr.value = 'true';
  li.setAttributeNode(attr);
  addEventsDragAndDrop(li);

}

body {
  margin: 0;
  min-width: 250px;
}

* {
  box-sizing: border-box;
  background-color: #292c30;
  color: white;
}

ul {
  list-style-type: none;
}

ul li {
  width: 51%;
  cursor: pointer;
  position: relative;
  padding: 15px 8px 12px 40px;
  list-style-type: none;
  font-size: 17px;
  font-style: normal;
  transition: 0.2s;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
}

ul li.checked {
  border: #292c30 1px;
  line-break: auto;
  color: rgb(121, 113, 113);
  text-decoration: line-through;
  font-style: italic;
}

ul li.checked::before {
  content: '';
  position: absolute;
  border-color: rgb(121, 113, 113);
  border-style: solid;
  border-width: 0 2px 2px 0;
  top: 10px;
  left: 16px;
  transform: rotate(45deg);
  height: 15px;
  width: 7px;
}

.close {
  position: absolute;
  right: 0;
  top: 0;
  width: 30%;
  padding: 10px;
}

.header {
  padding: 25px 60px;
  color: rgb(121, 113, 113);
  text-align: left;
  font-style: normal;
}

.header:after {
  content: "";
  display: table;
  clear: both;
}

input {
  margin: 0;
  border: rgb(121, 113, 113);
  border-radius: 0;
  width: 30%;
  padding: 10px;
  float: left;
  font-size: 15px;
  font-style: normal;
}

.addBtn {
  padding: 10px;
  width: 15%;
  float: left;
  text-align: center;
  font-size: 16px;
  cursor: pointer;
  transition: 0.3s;
  border-radius: 0;
}

<body>
  <div id="myDIV" class="header">
    <h2 style="margin:5px"></h2>
    <input type="text" id="myInput" font-style="italic" placeholder="Add new task.." style="border-block-end: solid 1px rgb(121, 113, 113);">
    <span onclick="newElement()" class="addBtn">+</span>
  </div>

  <ul id="myUL">
  </ul>
</body>