表单的下拉列表 - 在线编辑器

          <form>
  选择你喜欢的浏览器:
  <select id="myList" onchange="myFunction()">
  <option></option>
  <option>Google Chrome</option>
  <option>Firefox</option>
  <option>Internet Explorer</option>
  <option>Safari</option>
  <option>Opera</option>
</select>
  <p>你喜欢的浏览器为: <input type="text" id="demo" size="20"></p>
</form>
<script>
  function myFunction() {
    var mylist = document.getElementById("myList");
    document.getElementById("demo").value = mylist.options[mylist.selectedIndex].text;
  }
</script>
        