<template>
<!-- 通过class绑定开启或关闭某个CSS -->
<view class="box" :class="{box2:true}">box1</view>
<view class="box" :class="{box2:isActive}">box2</view>
<!-- 使用三元表达式实现开启关闭CSS的效果 -->
<view class="box" :class="true ? 'box2' : ''">box3</view>
<view :style="{width:'300px', height:300 + 'px', fontSize:size + 'px', border:'1px solid red'}">
Hello World
</view>
</template>
<script setup>
import {ref} from "vue";
let isActive = ref(false);
let size = ref(60);
</script>
<style lang="scss">
.box{
width:300px;
height:300px;
background-color: red;
margin: 10px;
}
.box2{
background-color: green;
}
</style>