纯css3实现美化复选框和手风琴效果（详细）

关键技术点和原理：

原理就是把 checkbox或 radio 给隐藏掉   ，然后给选框 绑定一个label标签。

然后用label标签作为容器，在里面放一个：before或一个after

用before模拟选框的框，用after来模拟选框的填充

通过

.magic-checkbox:checked + label:after {/*选框被选中时  显示after填充*/
  display: block;
  }

 来确定是否选中复选框，如果checked就把after的显示。

 先贴出html的代码

<div id="main">
    <div class="demo">
        <div class="col">
          <h4>Checkbox(复选按钮)</h4>
            
            <div class="opt">
                <input class="magic-checkbox" type="checkbox" name="layout" id="c1">
                <label for="c1">Normal</label>
            </div>
            <div class="opt">
                <input class="magic-checkbox" type="checkbox" name="layout" id="c2" checked>
                <label for="c2">Checked</label>
            </div>
            <div class="opt">
                <input class="magic-checkbox" type="checkbox" name="layout" id="c3" value="option2" disabled>
                <label for="c3" style="color:#ccc">Disabled</label>
            </div>
            <div class="opt">
                <input class="magic-checkbox" type="checkbox" name="layout" id="c4" checked disabled>
                <label for="c4" style="color:#ccc">Checked && Disabled</label>
            </div>



        </div>

        <div class="col">
            <h4>Radio(单选按钮)</h4>
            <div class="opt">
                <input class="magic-radio" type="radio" name="radio" id="r1" value="option1">
                <label for="r1">Normal</label>
            </div>
            <div class="opt">
                <input class="magic-radio" type="radio" name="radio" id="r2" value="option2" checked>
                <label for="r2">Checked</label>
            </div>
            <div class="opt">
                <input class="magic-radio" type="radio" name="radio" id="r3" value="option3" disabled>
                <label for="r3" style="color:#ccc">禁用</label>
            </div>
            <div class="opt">
                <input class="magic-radio" type="radio" id="r4" value="option4" checked disabled>
                <label for="r4" style="color:#ccc">Checked && Disabled</label>
            </div>
        </div>
    </div>
    
</div>

首先html的结构必须是

<div class="opt">
  <input class="magic-checkbox" type="checkbox" name="layout" id="c1">
  <label for="c1">Normal</label>
</div>

　　切记

<input class="magic-checkbox" type="checkbox" name="layout" id="c1">
  <label for="c1">Normal</label>

id和for的值一定要一致    这是通用写法    为了把label和input绑定在一块

下面给出css代码

/*--相关的单选复选按钮--*/
@keyframes hover-color {       /**复选框或单选框  边框 hover**/
  from {
    border-color: #c0c0c0; }
  to {
    border-color: #3e97eb; } }

.magic-radio,
.magic-checkbox {           /**必须要把    radio和 checkbox的隐藏或者切割掉**/
  position: absolute;
  display: none; }

.magic-radio[disabled],           /**radio   checkbox   指定disabled   html属性时的鼠标指针**/
.magic-checkbox[disabled] {
  cursor: not-allowed; }

.magic-radio + label,
.magic-checkbox + label {
  position: relative;
  display: block;
  padding-left: 30px;
  cursor: pointer;
  vertical-align: middle;
  }
  .magic-radio + label:hover:before,     /*选矿的 hover边框动画  */
  .magic-checkbox + label:hover:before {
    animation-duration: 0.4s;
    animation-fill-mode: both;
    animation-name: hover-color; }
  .magic-radio + label:before,
  .magic-checkbox + label:before {/*用before来模拟选框的框*/
    position: absolute;
    top: 0;
    left: 0;
    display: inline-block;
    width: 20px;
    height: 20px;
    content: '';
    border: 1px solid #c0c0c0; }
  .magic-radio + label:after,
  .magic-checkbox + label:after {/*用after模拟选框的 对号或园点    默认先隐藏*/
    position: absolute;
    display: none;
    content: '';
    }

.magic-radio[disabled] + label,
.magic-checkbox[disabled] + label {/*选框  被禁用时的外观*/
  cursor: not-allowed;
  color: #e4e4e4;
  }
  .magic-radio[disabled] + label:hover, .magic-radio[disabled] + label:before, .magic-radio[disabled] + label:after,
  .magic-checkbox[disabled] + label:hover,
  .magic-checkbox[disabled] + label:before,
  .magic-checkbox[disabled] + label:after {
    cursor: not-allowed; }/*禁用时的指针*/
  .magic-radio[disabled] + label:hover:before,
  .magic-checkbox[disabled] + label:hover:before {
    border: 1px solid #e4e4e4;
    animation-name: none; }/*禁用时的选框和填充*/
  .magic-radio[disabled] + label:before,
  .magic-checkbox[disabled] + label:before {
    border-color: #e4e4e4; }

.magic-radio:checked + label:before,
.magic-checkbox:checked + label:before {
  animation-name: none; }/*选框被选中时  去掉hover 动画*/

.magic-radio:checked + label:after,
.magic-checkbox:checked + label:after {/*选框被选中时  显示after填充*/
  display: block;
  }

.magic-radio + label:before {/*radio的选框应该是个圆形*/
  border-radius: 50%; }

.magic-radio + label:after {/*模拟出radio的园点填充*/
  top: 7px;
  left: 7px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #3e97eb; }

.magic-radio:checked + label:before {
  border: 1px solid #3e97eb; }

.magic-radio:checked[disabled] + label:before {
  border: 1px solid #c9e2f9; }

.magic-radio:checked[disabled] + label:after {
  background: #c9e2f9; }

.magic-checkbox + label:before {
  border-radius: 3px; }

.magic-checkbox + label:after {/*模拟出checkbox选框的对号填充*/
  top: 2px;
  left: 7px;
  box-sizing: border-box;
  width: 6px;
  height: 12px;
  transform: rotate(45deg);
  border-width: 2px;
  border-style: solid;
  border-color: #fff;
  border-top: 0;
  border-left: 0; }

.magic-checkbox:checked + label:before {
  border: #3e97eb;
  background: #3e97eb; }

.magic-checkbox:checked[disabled] + label:before {
  border: #c9e2f9;
  background: #c9e2f9; }

 下面是 代码运行效果

 demo： 

 

下面附赠一个手风琴效果（原理基本上也差不多）

也是在       ：check的时候做一些事情

demo 用checkbox和radio实现手风琴效果