<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<title></title>
<style type="text/css" media="screen">
/*关键点：float: right
-webkit-appearance: none
:checked 选择符
同级元素选择符 ~*/
.demo{
float: left;
}
.demo input{
float: right;
margin: 0;
width: 44px;
height: 44px;
border: 0 none;
outline: none;
-webkit-appearance: none; /*remove default style*/
-webkit-tap-highlight-color: rgba(0,0,0,0);
background: url(a.png) 0 -44px no-repeat;
opacity: .3;
transition: all 100ms linear;
}
.demo input:hover,
.demo input:hover ~ input{
opacity: 1;
}
.demo input:checked,
.demo input:checked ~ input{
background-position: 0 0;
opacity: 1;
}
</style>
</head>
<body>
<div class="demo">
<input type="radio" name="star" value="" placeholder="">
<input type="radio" name="star" value="" placeholder="">
<input type="radio" name="star" value="" placeholder="">
<input type="radio" name="star" value="" placeholder="">
<input type="radio" name="star" value="" placeholder="">
</div>
</body>
</html>
