今天分享一个iOS风格的switch开关按钮，如图：
主要是使用了<input type="checkbox">来模拟实现，具体的HTML：
<label><input class="mui-switch" type="checkbox"> 默认未选中</label> <label><input class="mui-switch" type="checkbox" checked> 默认选中</label> <label><input class="mui-switch mui-switch-animbg" type="checkbox"> 默认未选中,简单的背景过渡效果,加mui-switch-animbg类即可</label> <label><input class="mui-switch mui-switch-animbg" type="checkbox" checked> 默认选中</label> <label><input class="mui-switch mui-switch-anim" type="checkbox"> 默认未选中，过渡效果，加 mui-switch-anim 类即可</label> <label><input class="mui-switch mui-switch-anim" type="checkbox" checked> 默认选中</label>
在实际的使用中后来又增加了两个过渡效果，分别加 mui-switch-animbg和mui-switch-anim 类即可。
CSS代码
.mui-switch {
width: 52px;
height: 31px;
position: relative;
border: 1px solid #dfdfdf;
background-color: #fdfdfd;
box-shadow: #dfdfdf 0 0 0 0 inset;
border-radius: 20px;
border-top-left-radius: 20px;
border-top-right-radius: 20px;
border-bottom-left-radius: 20px;
border-bottom-right-radius: 20px;
background-clip: content-box;
display: inline-block;
-webkit-appearance: none;
user-select: none;
outline: none; }
.mui-switch:before {
content: '';
width: 29px;
height: 29px;
position: absolute;
top: 0px;
left: 0;
border-radius: 20px;
border-top-left-radius: 20px;
border-top-right-radius: 20px;
border-bottom-left-radius: 20px;
border-bottom-right-radius: 20px;
background-color: #fff;
box-shadow: 0 1px 3px rgba(0, 0, 0, 0.4); }
.mui-switch:checked {
border-color: #64bd63;
box-shadow: #64bd63 0 0 0 16px inset;
background-color: #64bd63; }
.mui-switch:checked:before {
left: 21px; }
.mui-switch.mui-switch-animbg {
transition: background-color ease 0.4s; }
.mui-switch.mui-switch-animbg:before {
transition: left 0.3s; }
.mui-switch.mui-switch-animbg:checked {
box-shadow: #dfdfdf 0 0 0 0 inset;
background-color: #64bd63;
transition: border-color 0.4s, background-color ease 0.4s; }
.mui-switch.mui-switch-animbg:checked:before {
transition: left 0.3s; }
.mui-switch.mui-switch-anim {
transition: border cubic-bezier(0, 0, 0, 1) 0.4s, box-shadow cubic-bezier(0, 0, 0, 1) 0.4s; }
.mui-switch.mui-switch-anim:before {
transition: left 0.3s; }
.mui-switch.mui-switch-anim:checked {
box-shadow: #64bd63 0 0 0 16px inset;
background-color: #64bd63;
transition: border ease 0.4s, box-shadow ease 0.4s, background-color ease 1.2s; }
.mui-switch.mui-switch-anim:checked:before {
transition: left 0.3s; }