如何完全避免粘贴?

我尝试了以下操作,但我可以继续粘贴到checkeditor上吗?

ckEditor 5

$(document).ready(function () {
      var ambit = $(document);

      // Disable Cut + Copy + Paste (input)
      ambit.on('copy paste cut', function (e) {
          e.preventDefault(); //disable cut,copy,paste
          return false;
      });

      // Disable Cut + Copy + Paste and Browser Admin Tools (all document)
      ambit.keydown(function (e) {
          var forbiddenCtrlKeys = new Array('c', 'x', 'v', 'ins', 'u');
          var forbiddenShiftKeys = new Array('del', 'ins', 'f2', 'f4', 'f7');
          var forbiddenCtrlShiftKeys = new Array('k', 'i', 'm', 's', 'j');
          var keyCode = (e.keyCode) ? e.keyCode : e.which;

          var isCtrl, isShift;
          isCtrl = e.ctrlKey;
          isShift = e.ctrlShift;

          string = getKeyCodeString(keyCode);

          if (string == 'f12')
          {
              e.preventDefault();
              return false;
          }

          if (isCtrl && !isShift) {
              for (i = 0; i < forbiddenCtrlKeys.length; i++) {
                  if (forbiddenCtrlKeys[i] == string) {
                      e.preventDefault();
                      return false;
                  }
              }
          }

          if (!isCtrl && isShift) {
              for (i = 0; i < forbiddenShiftKeys.length; i++) {
                  if (forbiddenShiftKeys[i] == string) {
                      e.preventDefault();
                      return false;
                  }
              }
          }

          if (isCtrl && isShift) {
              for (i = 0; i < forbiddenCtrlShiftKeys.length; i++) {
                  if (forbiddenCtrlShiftKeys[i] == string) {
                      e.preventDefault();
                      return false;
                  }
              }
          }

          return true;
      });

      var getKeyCodeString = function(keyCode)
      {
          var string;
          switch (keyCode) {
              case 45:
                  string = 'ins'; break;
              case 46:
                  string = 'del'; break;
              case 113:
                  string = 'f2'; break;
              case 115:
                  string = 'f4'; break;
              case 118:
                  string = 'f7'; break;
              case 123:
                  string = 'f12'; break;
              default:
                  string = String.fromCharCode(keyCode);
                  break;
          }
          return string.toLowerCase();
      }

    function ignorePaste() {
      $("[data-ignorepaste]").on("cut copy paste", function (e) {
        e.preventDefault(); //prevent the default behaviour 
      });
    };

    $(".ck-editor__editable").attr("data-ignorepaste");
      ignorePaste();
  });