实现代码：
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width,initial-scale=1.0,maximum-scale=1.0,user-scalable=0;"/>
<title>仿微信可换肤的CSS3美化表单</title>
<style>
.box{width: 80%;border:1px solid #ccc;padding: 30px;margin: 30px auto;position: relative;}
.box h2{width: 100%;height: 30px;top: 20px;right: 30px;text-align: right;position: absolute;}
.box h2 span{display: inline-block;width: 16px;height: 16px;margin: 2px;background: red;}
.box p{font-size: 16px;border-bottom: 1px dashed #4cd964;padding: 12px 0;padding-top: 9px;}
.toggle{position:relative;display:inline-block;pointer-events:auto;width: 100%;border-bottom: 1px dashed #ccc; }
.labelTxt{display: inline-block;height: 51px;line-height: 51px;float: left;}
/*switch*/
.toggle .track-switch{transition: all ease-in-out 0.25s 0s;display:inline-block;box-sizing:border-box;width:51px;height:31px;border:solid 2px #e6e6e6;border-radius:20px;background-color:#fff;content:' ';cursor:pointer;pointer-events:none;float: left;margin: 10px 10px 0 0;position: relative;}
.toggle .track-switch .handle{position: absolute;top: 0px;left: 0;width: 27px;height: 27px;border-radius: 100%;background: #fff;box-shadow:0 2px 7px rgba(0,0,0,0.35),0 1px 1px rgba(0,0,0,0.15);transition: background,transform 0.3s cubic-bezier(0,1.1,1,1.1) 0s;}
.toggle input:checked + .track-switch .handle{-webkit-transform:translate3d(20px,0,0);transform:translate3d(20px,0,0);background-color:#fff;}
.toggle input:checked + .track-switch{border-color:#4cd964;background-color:#4cd964;}
/*checkbox*/
.toggle .track-checkbox{transition: all ease-in-out 0.25s 0s;display:inline-block;box-sizing:border-box;width:31px;height:31px;border:solid 2px #e6e6e6;border-radius:100%;background-color:#fff;content:' ';cursor:pointer;pointer-events:none;float: left;margin: 8px 10px 0 0;position: relative;}
.toggle .track-checkbox .handle{position: absolute;top: 0px;left: 0;width: 27px;height: 27px;border-radius: 100%; transition: background,visibility,transform 0.3s cubic-bezier(0,1.1,1,1.1) 0s;}
.toggle .track-checkbox .handle::before{content:" ";left:9px;top:12px;position:absolute;width:2px;height:30%;background:#4cd964;transform:rotate(-40deg);transition: all 0.3s cubic-bezier(0,1.1,1,1.1) 0s;visibility: hidden;}
.toggle .track-checkbox .handle::after{content:" ";left:16px;top:6px;position:absolute;width:2px;height:58%;background:#4cd964;transform:rotate(-140deg);transition: all 0.3s cubic-bezier(0,1.1,1,1.1) 0s;visibility: hidden;}
.toggle input:checked + .track-checkbox{border-color:#4cd964;background-color:#4cd964;}
.toggle input:checked + .track-checkbox .handle::before{visibility:visible;background: #fff;}
.toggle input:checked + .track-checkbox .handle::after{visibility:visible; background: #fff;}
/*radio*/
.toggle .track-radio{transition: all ease-in-out 0.25s 0s;display:inline-block;box-sizing:border-box;width:31px;height:31px;border:solid 2px #e6e6e6;border-radius:100%;background-color:#fff;content:' ';cursor:pointer;pointer-events:none;float: left;margin: 8px 10px 0 0;position: relative;}
.toggle .track-radio .handle{position: absolute;top: 0px;left: 0;width: 27px;height: 27px;border-radius: 100%; transition: background,visibility,transform 0.3s cubic-bezier(0,1.1,1,1.1) 0s; }
.toggle .track-radio .handle::before{content:" ";left:9px;top:12px;position:absolute;width:2px;height:30%;background:#4cd964;transform:rotate(-40deg);transition: all 0.3s cubic-bezier(0,1.1,1,1.1) 0s;visibility: hidden;}
.toggle .track-radio .handle::after{content:" ";left:16px;top:6px;position:absolute;width:2px;height:58%;background:#4cd964;transform:rotate(-140deg);transition: all 0.3s cubic-bezier(0,1.1,1,1.1) 0s;visibility: hidden;}
.toggle input:checked + .track-radio{border-color:#4cd964;background-color:#4cd964;}
.toggle input:checked + .track-radio .handle::before{visibility:visible;background: #fff;}
.toggle input:checked + .track-radio .handle::after{visibility:visible; background: #fff;}
/*皮肤*/
.red input:checked + .track-switch{border-color:#ef473a;background-color:#ef473a;}
.red input:checked + .track-checkbox{border-color:#ef473a;background-color:#ef473a;}
.red .track-checkbox .handle::before{background: #ef473a;}
.red .track-checkbox .handle::after{background: #ef473a;}
.red .track-radio .handle::before{background: #ef473a;}
.red .track-radio .handle::after{background: #ef473a;}
.red input:checked + .track-radio{border-color:#ef473a;background-color:#ef473a;}
.yellow input:checked + .track-switch{border-color:#f90;background-color:#f90;}
.yellow input:checked + .track-checkbox{border-color:#f90;background-color:#f90;}
.yellow .track-checkbox .handle::before{background: #f90;}
.yellow .track-checkbox .handle::after{background: #f90;}
.yellow .track-radio .handle::before{background: #f90;}
.yellow .track-radio .handle::after{background: #f90;}
.yellow input:checked + .track-radio{border-color:#f90;background-color:#f90;}
.blue input:checked + .track-switch{border-color:#0c63ee;background-color:#0c63ee;}
.blue input:checked + .track-checkbox{border-color:#0c63ee;background-color:#0c63ee;}
.blue .track-checkbox .handle::before{background: #0c63ee;}
.blue .track-checkbox .handle::after{background: #0c63ee;}
.blue .track-radio .handle::before{background: #0c63ee;}
.blue .track-radio .handle::after{background: #0c63ee;}
.blue input:checked + .track-radio{border-color:#0c63ee;background-color:#0c63ee;}
.dark input:checked + .track-switch{border-color:#505050;background-color:#505050;}
.dark input:checked + .track-checkbox{border-color:#505050;background-color:#505050;}
.dark .track-checkbox .handle::before{background: #505050;}
.dark .track-checkbox .handle::after{background: #505050;}
.dark .track-radio .handle::before{background: #505050;}
.dark .track-radio .handle::after{background: #505050;}
.dark input:checked + .track-radio{border-color:#505050;background-color:#505050;}
</style>
</head>
<body>
<div class="box">
<h2><span></span>
<span></span>
<span></span>
<span></span></h2>
<p>选择开关</p>
<label class="toggle clearfix">
<input type="checkbox" checked style="display: none;">
<div class="track-switch">
<div class="handle"></div>
</div>
<div class="labelTxt">是否同意条款</div>
</label>
<p>复选列表项</p>
<label class="toggle clearfix">
<input type="checkbox" checked style="display: none;">
<div class="track-checkbox">
<div class="handle"></div>
</div>
<div class="labelTxt">我的职业是前端工程师</div>
</label>
<label class="toggle clearfix">
<input type="checkbox" checked style="display: none;">
<div class="track-checkbox">
<div class="handle"></div>
</div>
<div class="labelTxt">我的职业是老师</div>
</label>
<p>单选列表项</p>
<label class="toggle clearfix" >
<input type="radio" checked style="display: none;" name="sex">
<div class="track-radio">
<div class="handle"></div>
</div>
<div class="labelTxt">姓别：男</div>
</label>
<label class="toggle clearfix" >
<input type="radio" style="display: none;" name="sex">
<div class="track-radio">
<div class="handle"></div>
</div>
<div class="labelTxt">姓别：女</div>
</label>
</div>
<script>
var aspan=document.querySelector('.box').querySelectorAll('span');
var color=["#ef473a","#f90","#0c63ee","#505050"];
var classArray=["red","yellow","blue","dark"]
for(var i=0; i<aspan.length; i+=1){
aspan[i].index=i;
aspan[i].style.background=color[i];
aspan[i].onclick=function(){
var label=document.querySelectorAll('label');
for(var i=0; i<label.length; i+=1){
var className=label[i].className.substring(0,15);
switch(this.index) {
case 0:
label[i].className=className+" "+classArray[0]
break;
case 1:
label[i].className=className+" "+classArray[1]
break;
case 2:
label[i].className=className+" "+classArray[2]
break;
case 3:
label[i].className=className+" "+classArray[3]
break;
}
}
}
}
</script>
</body>
</html>
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