关于div可编辑的复制粘贴问题

  todoFilter(e) {
                 e.preventDefault();
                 if (!e.target.getAttribute('contenteditable')) {
                     return;
                 }
                 const cpTxt = e
                     .clipboardData
                     .getData('text');

                 const selection = window.getSelection ? window.getSelection() : document.selection;
                 if (!selection.rangeCount) return;
                 const range = selection.createRange ? selection.createRange() : selection.getRangeAt(0);
                 window._range = range;
                 if (!window.getSelection) {
                     range.pasteHTML(cpTxt);
                     range.collapse(false);
                     range.select();
                 } else {
                     range.collapse(false);
                     const hasR = range.createContextualFragment(cpTxt);
                     let hasR_lastChild = hasR.lastChild;
                     while (hasR_lastChild && hasR_lastChild.nodeName.toLowerCase() == 'br' && hasR_lastChild.previousSibling && hasR_lastChild.previousSibling.nodeName.toLowerCase() == 'br') {
                         var e = hasR_lastChild;
                         hasR_lastChild = hasR_lastChild.previousSibling;
                         hasR.removeChild(e);
                     }
                     range.insertNode(hasR);
                     if (hasR_lastChild) {
                         range.setEndAfter(hasR_lastChild);
                         range.setStartAfter(hasR_lastChild);
                     }
                     selection.removeAllRanges();
                     selection.addRange(range);
                 }
             },