try_dom_select_form 在线代码实例

 <form id="myForm">
<select id="mySelect">
  <option>Apple</option>
  <option>Pear</option>
  <option>Banana</option>
  <option>Orange</option>
</select>
</form>

<p>The id of the form is:
<script>
document.write(document.getElementById("mySelect").form.id);
</script>
</p>