昨天项目中使用select列表list-to-list，其中右边有一项是不可以让用户选中，就是必须选，我使用了selectedFields.options[0].disabled = 'disabled';或者selectedFields.options[0].disabled = true;在IE8下面是正常的，不可选的，但在IE6和IE7下没有起到作用，试了几种方法都不行，最后在网上找到下面代码，只要copy到你的js文件里，然后使用上面的disabled就可以做到不可选的效果了。
有用到可以看看：
Javascript代码
/****************************************************************
* Author: Alistair Lattimore
* Website: http://www.lattimore.id.au/
* Contact: http://www.lattimore.id.au/contact/
* Errors, suggestions or comments
* Date: 30 June 2005
* Version: 1.0
* Purpose: Emulate the disabled attributte for the <option>
* element in Internet Explorer.
* Use: You are free to use this script in non-commercial
* applications. You are however required to leave
* this comment at the top of this file.
*
* I'd love an email if you find a use for it on your
* site, though not required.
****************************************************************/
window.onload = function() {
if (document.getElementsByTagName) {
var s = document.getElementsByTagName("select");
if (s.length > 0) {
window.select_current = new Array();
for (var i=0, select; select = s[i]; i++) {
if(select.id == "your select id") {[//你的select id
select.onfocus = function(){ window.select_current[this.id] = this.selectedIndex; }
select.onchange = function(){ restore(this); }
emulate(select);
[color=red]}[/color]}
}
}
}
function restore(e) {
if (e.options[e.selectedIndex].disabled) {
e.selectedIndex = window.select_current[e.id];
}
}
function emulate(e) {
for (var i=0, option; option = e.options[i]; i++) {
if (option.disabled) {
option.style.color = "graytext";
}
else {
option.style.color = "menutext";
}
}
}
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