removeItemAt

<script type="text/javascript">
function removeSelectedItem() {
  var myListBox = document.getElementById('myListBox');

  if(myListBox.selectedIndex == -1){
    return; // no item selected so return
  } else {
    myListBox.removeItemAt(myListBox.selectedIndex);
  }
}
</script>

<button label="Remove selected item" oncommand="removeSelectedItem()" />

<listbox id="myListBox">
  <listitem label="Alpha" />
  <listitem label="Beta" />
  <listitem label="Oscar" />
  <listitem label="Foxtrot" />
</listbox>

• removeAllItems() 、 appendItem() 、 insertItemAt()