使用下面的代码复制剪贴板上的跨区文本

Question

我想复制任何span部分中的文本，并在CTRL + V上的任何地方使用它。但是下面的代码只适用于输入，而不适用于span。

代码如下：

  $scope.copyCode = function(name, code, index) {
  $("#buttonCopyClass" + index).css("display", "none");
  $("#buttonCopiedClass" + index).css("display", "block");
  ga('send', 'event', 'userCopiedCoupen', name, code);
  copyToClipboard(document.getElementById("copyTarget"));
  return event.stopPropagation();
};
copyToClipboard = function(elem) {
  var currentFocus, e, isInput, origSelectionEnd, origSelectionStart, succeed, target, targetId;
  targetId = '_hiddenCopyText_';
  isInput = elem.tagName === 'INPUT' || elem.tagName === 'TEXTAREA';
  origSelectionStart = void 0;
  origSelectionEnd = void 0;
  if (isInput) {
    console.log(78);
    target = elem;
    origSelectionStart = elem.selectionStart;
    origSelectionEnd = elem.selectionEnd;
  } else {
    console.log(7889);
    target = document.getElementById(targetId);
    if (!target) {
      target = document.createElement('textarea');
      target.style.position = 'absolute';
      target.style.left = '-9999px';
      target.style.top = '0';
      target.id = targetId;
      document.body.appendChild(target);
    }
    target.textContent = elem.textContent;
  }
  currentFocus = document.activeElement;
  target.focus();
  target.setSelectionRange(0, target.value.length);
  succeed = void 0;
  try {
    succeed = document.execCommand('copy');
  } catch (error1) {
    e = error1;
    succeed = false;
  }
  if (currentFocus && typeof currentFocus.focus === 'function') {
    currentFocus.focus();
  }
  if (isInput) {
    elem.setSelectionRange(origSelectionStart, origSelectionEnd);
  } else {
    target.textContent = '';
  }
  return succeed;
};

以上代码我习惯于获取输入场的文本，但我需要这个与sapn feild合作。