我需要一个10秒的计时器，它会在计时器结束时解锁一个按钮

<button id="myButton" disabled>点击解锁</button>
<div id="timer">10</div>

#myButton {
  padding: 10px 20px;
  background-color: #4CAF50;
  color: white;
  border: none;
  cursor: not-allowed;
}

#myButton:enabled {
  cursor: pointer;
}

#timer {
  font-size: 24px;
  margin-top: 10px;
}

var button = document.getElementById("myButton");
var timer = document.getElementById("timer");
var count = 10;

function startTimer() {
  button.disabled = true;
  var interval = setInterval(function() {
    count--;
    timer.innerHTML = count;
    if (count <= 0) {
      clearInterval(interval);
      button.disabled = false;
    }
  }, 1000);
}

button.addEventListener("click", startTimer);