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<input type="text" value="www.xxx.com?xxx=xxx" size="50" id='registerUrl'/>
                                
<input type="button" value="复制" onclick="javascript:setCopy($('#registerUrl').val())"/>

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<script>
            function setCopy(_sTxt){
                try{
                    if(window.clipboardData) {
                        window.clipboardData.setData("Text", _sTxt);
                    } 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 = _sTxt;
                        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);
                    }
                }catch(e){}
            } 
        </script>