支持Firefox和IE的文本复制Javascript

function copyToClipboard(text){
if(text==null||text=='undefined')
return;

//window.clipboardData.setData("Text",text);
if (window.clipboardData){
window.clipboardData.setData("Text", text);
}
else if (window.netscape){
netscape.security.PrivilegeManager.enablePrivilege('UniversalXPConnect');
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=text;

str.data=copytext;

trans.setTransferData("text/unicode",str,copytext.length*2);

var clipid=Components.interfaces.nsIClipboard;

if (!clip) return ;

clip.setData(trans,null,clipid.kGlobalClipboard);

}else{
window.alert("不支持该浏览器的复制功能，请手动复制");

return;

}

window.alert("已复制成功，请直接粘贴$codeFormat");
}