关于div可编辑的复制粘贴问题

 1  todoFilter(e) {
 2                 e.preventDefault();
 3                 if (!e.target.getAttribute('contenteditable')) {
 4                     return;
 5                 }
 6                 const cpTxt = e
 7                     .clipboardData
 8                     .getData('text');
 9     
10                 const selection = window.getSelection ? window.getSelection() : document.selection;
11                 if (!selection.rangeCount) return;
12                 const range = selection.createRange ? selection.createRange() : selection.getRangeAt(0);
13                 window._range = range;
14                 if (!window.getSelection) {
15                     range.pasteHTML(cpTxt);
16                     range.collapse(false);
17                     range.select();
18                 } else {
19                     range.collapse(false);
20                     const hasR = range.createContextualFragment(cpTxt);
21                     let hasR_lastChild = hasR.lastChild;
22                     while (hasR_lastChild && hasR_lastChild.nodeName.toLowerCase() == 'br' && hasR_lastChild.previousSibling && hasR_lastChild.previousSibling.nodeName.toLowerCase() == 'br') {
23                         var e = hasR_lastChild;
24                         hasR_lastChild = hasR_lastChild.previousSibling;
25                         hasR.removeChild(e);
26                     }
27                     range.insertNode(hasR);
28                     if (hasR_lastChild) {
29                         range.setEndAfter(hasR_lastChild);
30                         range.setStartAfter(hasR_lastChild);
31                     }
32                     selection.removeAllRanges();
33                     selection.addRange(range);
34                 }
35             },
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