js复制到剪切板的实例方法

<script type="text/javascript" language="javascript">
        //复制到剪切板js代码
        function copyToClipBoard(s) {
            //alert(s);
            if (window.clipboardData) {
                window.clipboardData.setData("Text", s);
                alert("已经复制到剪切板！"+ "\n" + s);
            } else if (navigator.userAgent.indexOf("Opera") != -1) {
                window.location = s;
            } else if (window.netscape) {
                try {
                    netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
                } catch (e) {
                    alert("被浏览器拒绝！\n请在浏览器地址栏输入'about:config'并回车\n然后将'signed.applets.codebase_principal_support'设置为'true'");
                }
                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 = s;
                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("已经复制到剪切板！" + "\n" + s)
            }
        }</script>