JS给li标签排序

<meta charset="utf-8">
<p>点击按钮按字母列表排序:</p>
<button onclick="sortList()">排序</button>
<ul id="ul2">
  <li>fff</li>
  <li>eee</li>
  <li>bbb</li>
  <li>aaa</li>
  <li>ccc</li>
  <li>ddd</li>
</ul>

<script>
function sortList(){
  var i, li, shouldSwitch;
  var switching = true;
  while(switching){
    switching = false;
    li = ul2.getElementsByTagName("li");
    for(i=0; i<(li.length-1); i++){
      shouldSwitch = false;
      if(li[i].innerHTML.toLowerCase() > li[i+1].innerHTML.toLowerCase()){
        shouldSwitch= true;
        break;
      }
    }
    if(shouldSwitch){
      li[i].parentNode.insertBefore(li[i+1], li[i]);
      switching = true;
    }
  }
}
</script>

运行结果