css3实现的switch开关按钮

<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>

label {
display: block;
 vertical-align: middle;
}

label, input, select {
 vertical-align: middle;
}

.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;
}