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                <div id="result"></div>
<div>獲得金額: <span id="get">0 円</span></div>
  <button id="roll">押す</button>
<textarea id="log" cols="40" rows="5"></textarea>
  <button id="retry">やり直し</button>


                #roll {
font-size: 10pt;


                let count = 0
let money = 0

const textResult = document.querySelector("#result")
const btnRoll = document.querySelector("#roll")
const btnReset = document.querySelector("#retry")
const areaLog = document.querySelector("#log")
const textmoney = document.querySelector("#get")

function refleshmoney(money) {
  textmoney.textContent = `${money} 億円`

function roll(n) {
  const probability = (1/2) ** n
  const test = probability > Math.random()
  textResult.innerHTML = `${n} 回目 (確率は 1/${(1/probability)}): <span style='color: ${test ? "green" : "red"}'>${test ? "生還" : "💩失敗💩"}</span>`
  if (test) {
    areaLog.textContent += `脱出可能!(1/${(1/probability)}の確率で当選)\n`
    money += 1

btnRoll.onclick = () => {
  count += 1

btnReset.onclick = () => {
  count = 0
  money = 0
  areaLog.textContent = ""
  textResult.textContent = ""