我目前正在尝试使用onchange处理程序跟踪一个react-remotes组件的event.target.selectionStart和event.target.selectionEnd。我如何才能访问这个输入的selectionStart和selectionEnd？

<MentionsInput
    value={value}
    onChange={handleChange}
    placeholder={placeholder}
  >
<Mentions/>
<Mentions2/>

handleChange(e){
  console.log(e)//just object with one key: target
  console.log(e.target.value) //returns value
  console.log(e.target) //object with key value pair for "value": [value]
  console.log(e.target.selectionStart) //undefined
  console.log(e.target.selectionEnd) //undefined
}

参考：https://github.com/signavio/react-mentionsinsert at cursor in react