如何将on off文本添加到现有切换开关

<div class="toggle-switch">
  <input type="checkbox" id="switch">
  <label for="switch"></label>
  <span class="toggle-text">off</span>
</div>

.toggle-switch {
  position: relative;
  display: inline-block;
  width: 60px;
  height: 34px;
}

.toggle-switch input[type="checkbox"] {
  display: none;
}

.toggle-switch label {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: #ccc;
  border-radius: 34px;
  cursor: pointer;
}

.toggle-switch label:before {
  content: "";
  position: absolute;
  top: 2px;
  left: 2px;
  width: 30px;
  height: 30px;
  background-color: #fff;
  border-radius: 50%;
  transition: transform 0.2s;
}

.toggle-switch input[type="checkbox"]:checked + label {
  background-color: #4CAF50;
}

.toggle-switch input[type="checkbox"]:checked + label:before {
  transform: translateX(26px);
}

.toggle-text {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  color: #fff;
  font-size: 14px;
}

.toggle-text.on {
  left: 10px;
}

.toggle-text.off {
  right: 10px;
}

const switchElement = document.getElementById('switch');
const textElement = document.querySelector('.toggle-text');

switchElement.addEventListener('click', function() {
  if (this.checked) {
    textElement.textContent = 'on';
    textElement.classList.remove('off');
    textElement.classList.add('on');
  } else {
    textElement.textContent = 'off';
    textElement.classList.remove('on');
    textElement.classList.add('off');
  }
});