js input 开关

<label class="switch">
  <input type="checkbox" id="mySwitch">
  <span class="slider round"></span>
</label>

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

/* 隐藏默认的checkbox */
.switch input { 
  opacity: 0;
  width: 0;
  height: 0;
}

/* 创建滑块 */
.slider {
  position: absolute;
  cursor: pointer;
  top: 0; left: 0; right: 0; bottom: 0;
  background-color: #ccc;
  -webkit-transition: .4s; /* 平滑过渡效果 */
  transition: .4s;
}

.slider:before {
  position: absolute;
  content: "";
  height: 26px; width: 26px;
  left: 4px; bottom: 4px;
  background-color: white;
  -webkit-transition: .4s;
  transition: .4s;
}

/* 当checkbox被选中时改变滑块颜色 */
input:checked + .slider {
  background-color: #2196F3;
}

/* 当checkbox被选中时滑块移动 */
input:focus + .slider {
  box-shadow: 0 0 1px #2196F3;
}

input:checked + .slider:before {
  -webkit-transform: translateX(26px);
  -ms-transform: translateX(26px);
  transform: translateX(26px);
}

/* 给滑块添加圆角 */
.slider.round {
  border-radius: 34px;
}

.slider.round:before {
  border-radius: 50%;
}

document.getElementById('mySwitch').addEventListener('change', function() {
  if (this.checked) {
    console.log('开关已打开');
    // 在这里添加开关打开时的逻辑
  } else {
    console.log('开关已关闭');
    // 在这里添加开关关闭时的逻辑
  }
});