VUE3页面div如何点击改变样式

<template>
  <div class="c-container">
    <div
      v-for="(item, index) in items"
      :key="index"
      :class="
        isActive === index
          ? 'c-item c-item-selected'
          : 'c-item c-item-noselected'
      "
      :style="`background:url(各种图标) no-repeat center 15px;`"
      @click="changeCategory(item, index)"
    >
      <div class="c-text">{{ item.text }}</div>
    </div>
  </div>
</template>

<script>
import { defineComponent, toRefs, reactive, onMounted, ref } from "vue";
import { getCategory } from "@/components/Category";
import * as tools from "@/utils";

export default defineComponent({
  setup(props, context) {
    let isActive = ref(-1);

    const changeCategory = (item, index) => {
      if (isActive.value !== index) {//如果点击的div没有处于置亮状态，则置亮
        isActive.value = index;
      } else {//否则取消置亮
        isActive.value = -1;
      }
    };

    const state = reactive({
      items: [],
    });
    onMounted(async () => {
        state.items = 。。。;//获取分类数据
    });
    
    return {
      ...toRefs(state),
      changeCategory,
      isActive,
    };
  },
});
</script>

<style scoped>
.c-container {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-around;
  min-width: 390px;
}
.c-item {
  width: 90px;
  height: 90px;
  margin-bottom: 10px;
  border-radius: 5px;
  cursor: pointer;
}
.c-item-noselected {
  border: solid 1px #eee;
}
.c-item-selected {
  border: solid 1px #1270d6;
}
.c-text {
  margin-top: 60px;
}
</style>

   :class="
     isActive === index
       ? 'c-item c-item-selected'
       : 'c-item c-item-noselected'
   "

  let isActive = ref(-1);

  const changeCategory = (item, index) => {
    if (isActive.value !== index) {//如果点击的div没有处于置亮状态，则置亮
      isActive.value = index;
    } else {//否则取消置亮
      isActive.value = -1;
    }
  };