获取文本输入框的焦点位置，并插入文本

<el-input
    ref="inputRef"
    v-model="formData.antTemplateContent"
    rows="5"
    type="textarea"
    placeholder="请输入模板内容"
>
</el-input>



const insertText = (textToInsert = '插入的文本') => {
  if (inputRef.value) {
    const textarea = inputRef.value.$el.querySelector('textarea');
    const start = textarea.selectionStart;
    const end = textarea.selectionEnd; 
    const textBefore = textarea.value.substring(0, start);
    const textAfter = textarea.value.substring(end, textarea.value.length);
    textarea.value = textBefore + textToInsert + textAfter;
    textarea.setSelectionRange(start + textToInsert.length, start + textToInsert.length);
    textarea.focus();
  }
};