jQuery实现点击文本框复制内容到剪贴板的方法

//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" });
  });
}