jQuery简单实现点击文本框复制内容到剪贴板上的方法

//点击文本框复制其内容到剪贴板上方法function copyToClipboard(txt) {  if (window.clipboardData) {    window.clipboardData.clearData();    window.clipboardData.setData("Text", txt);    alert("已经成功复制到剪帖板上！");  } 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("已经成功复制到剪帖板上！");  }}//点击文本框复制其内容到剪贴板上function setCopyLink() {  $("#txt_CopyLink").val(document.URL)  .focus(function () {    $(this).css({ "background-color": "#ddd" }).select();    copyToClipboard($("#txt_CopyLink").val());  }).blur(function () {    $(this).css({ "background-color": "#fff" });  });}