动态删除select中的所有options、某一项option以及动态添加select中的项option，在IE和FireFox都能测试成功，感兴趣的朋友可以参考下，希望对大家有所帮助
function getvalue(obj)
{
var m=obj.options[obj.selectedIndex].value
alert(m);//获取value
var n=obj.options[obj.selectedIndex].text
alert(n);//获取文本
}
=======================================
1 检测是否有选中
if (objSelect.selectedIndex > - 1 ) {
// 说明选中
} else {
// 说明没有选中
}
2 删除被选中的项
objSelect.options[objSelect.selectedIndex] = null ;
3 增加项
objSelect.options[objSelect.length] = new Option( " 你好 " , " hello " );
4 修改所选择中的项
objSelect.options[objSelect.selectedIndex] = new Option( " 你好 " , " hello " );
5 得到所选择项的文本
objSelect.options[objSelect.selectedIndex].text;
6 得到所选择项的值
objSelect.options[objSelect.selectedIndex].value;
=======================================
<%@LANGUAGE="VBSCRIPT" CODEPAGE="936"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>JS对select动态添加options操作[IE和FireFox兼容]</title>
<script language="javascript" type="text/javascript">
function xlbchange(s){
switch (s){
case "1" :
document.getElementById("lb").options.length=0;
var soojs_value=[0,1,2,3];
var soojs_text=["精神提炼","作风设计","目标设置","理念提升"];
for ( var i=0;i<soojs_value.length;i++){
var oOption = document.createElement("OPTION");
oOption.value=soojs_value[i];
oOption.text=soojs_text[i];
zpmange.lb.options.add(oOption);
}
break;
case "2" :
document.getElementById("lb").options.length=0;
var soojs_value=[0,1,2,3,4,5,6,7];
var soojs_text=["校徽","校训","校歌","校名字体","校史展室","宣传画册","宣传光盘","办公用品纪念品"];
for ( var i=0;i<soojs_value.length;i++){
var oOption = document.createElement("OPTION");
oOption.value=soojs_value[i];
oOption.text=soojs_text[i];
zpmange.lb.options.add(oOption);
}
break;
case "3":
document.getElementById("lb").options.length=0;
var soojs_value=[0,1,2,3];
var soojs_text=["校园景观设计","校园雕塑设计","校园浮雕设计","走廊文化设计"];
for ( var i=0;i<soojs_value.length;i++){
var oOption = document.createElement("OPTION");
oOption.value=soojs_value[i];
oOption.text=soojs_text[i];
zpmange.lb.options.add(oOption);
}
break;
case "4":
document.getElementById("lb").options.length=0;
var soojs_value=[0,1,2];
var soojs_text=["学校制度","文化活动","行为规范"];
for ( var i=0;i<soojs_value.length;i++){
var oOption = document.createElement("OPTION");
oOption.value=soojs_value[i];
oOption.text=soojs_text[i];
zpmange.lb.options.add(oOption);
}
break;
default :
document.getElementById("lb").options.length=0;
var oOption = document.createElement("OPTION");
oOption.value=0;
oOption.text="请选择作品类别";
zpmange.lb.options.add(oOption);
}
}
</script>
</head>
<body>
<form action="zpmange.asp" name="zpmange" method="post">
<p><select > </td>
</tr>
</table>
</form>
</body>
</html>