偶公司程序员做过一个点击按纽复制本贴地址的，函数贴出来看对你有没有帮助．
function copyToClipBoard(){
var clipBoardContent="";
clipBoardContent+="ＸＸＸＸＸＸＸＸＸＸＸＸＸＸＸＸＸＸＸＸＸ";
if(window.clipboardData){
window.clipboardData.clearData();
window.clipboardData.setData("Text", clipBoardContent);
}else if(navigator.userAgent.indexOf("Opera") != -1){
window.location = clipBoardContent;
}else if (window.netscape){
try{
netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
}catch (e){
alert("您的当前浏览器设置已关闭此功能！请按以下步骤开启此功能！\n新开一个浏览器，在浏览器地址栏输入'about:config'并回车。\n然后找到'signed.applets.codebase_principal_support'项，双击后设置为'true'。\n声明：本功能不会危极您计算机或数据的安全！");
}
var clip = Components.classes['@mozilla.org/widget/clipboard;1'].createInstance(Components.interfaces.nsIClipboard);
if (!clip) return;
var trans = Components.classes['@mozilla.org/widget/transferable;1'].createInstance(Components.interfaces.nsITransferable);
if (!trans) return;
trans.addDataFlavor('text/unicode');
var str = new Object();
var len = new Object();
var str = Components.classes["@mozilla.org/supports-string;1"].createInstance(Components.interfaces.nsISupportsString);
var copytext = clipBoardContent;
str.data = copytext;
trans.setTransferData("text/unicode",str,copytext.length*2);
var clipid = Components.interfaces.nsIClipboard;
if (!clip) return false;
clip.setData(trans,null,clipid.kGlobalClipboard);
}
alert("已成功复制！");
return true;
}
