無他上代碼
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head>
<body>
<style>
body{
counter-reset:first-class 0;
}
.container{
counter-reset:second-class 0;
}
.f-class::before{
counter-increment:first-class;
content:counter(first-class)
}
.item::before{
counter-increment:second-class 1;
content:counter(first-class)"-"counter(second-class);
}
</style>
<divi class="container">
<div class= "f-class">零食</div>
<div class= "item">巧克力</div>
<div class= "item">餅乾</div>
<div class= "item">糖果</div>
</div>
<divi class="container">
<div class= "f-class">蔬菜</div>
<div class= "item">黃瓜</div>
<div class= "item">木瓜</div>
<div class= "item">西紅柿</div>
</div>
</body>
</html>