我想自定义添加一个div . 可是添加不进去。div 无法展示，只能显示p标签

[wenjing0628]

MU.insertDiv = function(string,alt) { const div = _inserDivAtSelection(string, alt);

_callbackInput();
return div;

} const _inserDivAtSelection = function(string, alt, dimensions) { const sel = document.getSelection(); const range = sel.getRangeAt(0); const div = document.createElement('div'); range.insertNode(div); var newContent = document.createTextNode(string); div.appendChild(newContent); return div; };