<div
 class="static"
 v-bind:class="{ active: isActive, 'text-danger': hasError }"
></div>
//data如下
data: {
 isActive: true,
 hasError: false
}
//渲染結果為
<div class="static active"></div>

<template>
 <div>
 <!-- v-for循環(huán)渲染arr -->
 <!-- 把當前點擊的name通過selected傳給data里的active -->
 <!-- 判斷如果active的值與當前點擊的name相同 則給當前點擊的div加上active樣式 -->
 <div id="box" 
 v-for="(item,index) in arr" 
 :key="index"
 @click = selected(item.name)
 :class="{active:active == item.name}"
 >
 {{item.name}}
 </div>
 </div>
</template>
<script>
export default {
 name: "index",
 data() {
 return {
 arr: [
 { name: "娃哈哈" },
 { name: "椰子汁" },
 { name: "檸檬茶" },
 { name: "可樂" },
 { name: "雪碧" }
 ],
 active: "娃哈哈"
 };
 },
 methods: {
 selected(name){
 this.active = name
 console.log(name)
 }
 }
};
</script>
<style>
.active {
 background-color: orange;
 color: white;
}
#box {
 width: 100px;
 height: 100px;
 margin: 10px;
 float: left;
 border: 1px solid #000;
}
</style>