1.添加option
??var theColor = document.getElementById("color");
??
??//var oOption1 = new Option("white","3");
??var oOption1 = document.createElement("OPTION");
??oOption1.innerHTML="white";
??oOption1.value ="3";
??theColor.appendChild(oOption1);

??var oOption2 = document.createElement("OPTION");
??oOption2.innerText = "black";
??oOption2.value = "4";
??theColor.options.add(oOption2);

[注]
?? a.
???? document.createElement
?? ?document.createElement("OPTION"),document.createElement("tr"),
?? ?document.createElement("table")...

??? b.
????? 兩種都可以使用oOptionX.selected = true來選擇
????? 而第二個則還可以通過theColor.selectedIndex =2;
????? 或者theColor.value = "4"來選擇
?????
2.
? xSelect.children(i) == xSelect.options[i]
? xSelect.getElementsByTagName('option');

3.

<script>

	function showOptions(){
		var someNodeList = $('lstEmployees').getElementsByTagName('option');
		var nodes = $A(someNodeList);

		nodes.each(function(node){
				alert(node.nodeName + ': ' + node.innerHTML);
			});
	}
</script>

<select id="lstEmployees" size="10" >
	<option value="5">Buchanan, Steven</option>
	<option value="8">Callahan, Laura</option>
	<option value="1">Davolio, Nancy</option>
</select>

<input type="button" value="Show the options" onclick="showOptions();" >