블로그에 올려두긴 했는데
파일 받아서 하셔도 됩니다
https://setstech.tistory.com/entry/명탐정-페페-메이플스토리-계산기





소스코드
<input type="text" name="dtText" id="dtText" />
<button onclick="detectiveMaple();">계산하기</button>
<br>
<span id="evt">텍스트변환</span>
<br>
<span id="result">계산결과</span>
<script type="text/javascript">
detectiveMaple('7+EA/R+T/H');

function detectiveMaple() {
let inputTxt = document.getElementById('dtText').value;
let evTxt = inputTxt.replace(/[A]/,'0').replace(/[D]/,'2').replace(/[H]/,'3').replace(/[G]/,'4').replace(/[I]/,'5').replace(/[E]/,'6').replace(/[T]/,'7').replace(/[N]/,'8').replace(/[R]/,'9').trim();
console.log(evTxt);
console.log(eval(evTxt));
document.getElementById('evt').innerHTML = '텍스트변환 : ' +  evTxt;
document.getElementById('result').innerHTML = '계산결과 : ' + eval(evTxt);
}

</script>