菜鸟：select 组件自动增加项数

[javastart]

怎样通过命令向select中增加一项

[fason]

<select name="test">
</select>
<input onblur="test.options[test.options.length]=new Option(value,value)">

[希默软件]

<script>
// 添加选项
function addOption(pos){
var objSelect = document.myForm.mySelect;
// 取得字段值
var strName = document.myForm.myOptionName.value;
var strValue = document.myForm.myOptionValue.value;
// 建立Option对象
var objOption = new Option(strName,strValue);
if (pos == -1 & pos > objSelect.options.length)
objSelect.options[objSelect.options.length] = objOption;
else
objSelect.add(objOption, pos);
}
// 删除选项
function deleteOption(type){
var objSelect = document.myForm.mySelect;
if(objSelect.options.length>0){
if (type == true)
objSelect.options[objSelect.selectedIndex] = null;
else
objSelect.remove(objSelect.selectedIndex);
}
else
alert("已经没有选项可以删除了！")
}
// 显示选项信息
function showOption(objForm){
var objSelect = objForm.mySelect;
if(objSelect.options.length>0){
document.all.myOptionName.value = objSelect.options[objSelect.selectedIndex].text;
document.all.myOptionValue.value = objSelect.options[objSelect.selectedIndex].value;
}
else
alert("没有选项可以显示！")
}
</script>
<form name="myForm">
<select name="mySelect">
<option value="value1" Selected>HTML</option>
<option value="value2">JavaScript</option>
<option value="value3">VBScript</option>
</select>
<input type="button" onclick="showOption(this.form)" value="显示">
<input type="button" onclick="deleteOption(true)" value="删除">
<input type="button" onclick="deleteOption(false)" value="Remove方法"><br><br>
选项名称 : <input type="text" name="myOptionName" value="CSS"><br>
选项的值 : <input type="text" name="myOptionValue" value="value4">
<input type="button" onclick="addOption(-1)" value="添加">
<input type="button" onclick="addOption(0)" value="插入">
</form>

[javastart]

谢谢楼上两位高手