Code:

<p>点击按钮按字母列表排序:</p>
<button onclick="sortList()">排序</button>
<ul id="id01">
    <li>Oslo</li>
    <li>Stockholm</li>
    <li>Helsinki</li>
    <li>Berlin</li>
    <li>Rome</li>
    <li>Madrid</li>
</ul>
<script>
    function sortList() {
      var list, i, switching, b, shouldSwitch;
      list = document.getElementById("id01");
      switching = true;
      /*Make a loop that will continue until
      no switching has been done:*/
      while (switching) {
        //start by saying: no switching is done:
        switching = false;
        b = list.getElementsByTagName("LI");
        //Loop through all list items:
        for (i = 0; i < (b.length - 1); i++) {
          //start by saying there should be no switching:
          shouldSwitch = false;
          /*check if the next item should
          switch place with the current item:*/
          if (b[i].innerHTML.toLowerCase() > b[i + 1].innerHTML.toLowerCase()) {
            /*if next item is alphabetically lower than current item,
            mark as a switch and break the loop:*/
            shouldSwitch= true;
            break;
          }
        }
        if (shouldSwitch) {
          /*If a switch has been marked, make the switch
          and mark the switch as done:*/
          b[i].parentNode.insertBefore(b[i + 1], b[i]);
          switching = true;
        }
      }
    }
</script>

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