<style>
.point:hover{cursor:pointer}
.big:hover{background:red}
</style>
[<span class="big point">大</span>  <span class="middle point">中</span>  <span class="small point">小</span>]
<p class="content">咋通过css实现来着?改这个类样式我知道,用js也好改,但是不值得,咋选中来着</p>