JS复制到剪贴板兼容FF

最近需要做个复制到剪贴板功能，做为后发现在FF下不可用，最后按如下方式解决，请看代码：

<mce:script type="text/javascript"><!-- function copyToClipboard(selContent) { if(window.clipboardData) { window.clipboardData.clearData(); window.clipboardData.setData("Text", selContent); alert("IE下复制成功！"); } else if(navigator.userAgent.indexOf("Opera") != -1) { window.location = selContent; } 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 = selContent; 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("FF下复制成功！"); } } // --></mce:script> 测试内容：<input id="testContent" name="testContent" type="text" value="这是测试内容" style="width:200px"/> <input type="button" onclick="copyToClipboard(document.getElementById('testContent').value);" value="复制"/><br/> 粘贴测试：<input type="text" style="width:200px"/>