使用js写个方法在光标的位置插入文字"```javascript function insertTextAtCurso

"```javascript function insertTextAtCursor(text) { var sel, range; if (window.getSelection) { sel = window.getSelection(); if (sel.getRangeAt && sel.rangeCount) { range = sel.getRangeAt(0); range.deleteContents(); range.insertNode(document.createTextNode(text)); } } else if (document.selection && document.selection.createRange) { range = document.selection.createRange(); range.text = text; } }