(转载)复制内容到剪切板

		//txt参数为显示和复制的文本内容
		function copyToBoard(txt) {
			if(window.clipboardData) { 
				window.clipboardData.clearData();   
				window.clipboardData.setData("Text",txt);
			}else if(navigator.userAgent.indexOf("Opera") != -1) {   
				window.location = txt;   
			} 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 = txt;   
				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("你已经成功复制本帖地址，请直接粘贴推荐给你的朋友!");
		}