VUE如何实现点击文字添加颜色(动态修改class)

<template>
  <div class="list2">
    <ul>
      <li
        v-for="(item,index) in List"
        :key="index"
        :class="{activeColor:colorIndex===index}"
        @click="changeColor(item,index)"
      >
        <span>{{item.name}}</span>
      </li>
    </ul>
  </div>
</template>

<script>
export default {
  name: "list",
  components: {},
  data() {
    return {
      List: [
        { name: "总的" },
        { name: "部分1" },
        { name: "部分2" },
        { name: "部分3" }
      ],
      colorIndex: -1
    };
  },
  mounted() {},
  methods: {
    changeColor(item, index) {
      this.colorIndex = index;
    }
  }
};
</script>

<style lang="less" scoped>
.list2 {
  width: 100px;
  ul {
    list-style: none;
    .activeColor {
      background-color: #f6fbff;
      color: #298adb;
    }
    li {
      cursor: pointer;
    }
  }
}
</style>

<template>
  <div class="list2">
    <ul>
      <li
        v-for="(item,index) in List"
        :key="index"
        :class="{activeColor:item.active}"
        @click="changeColor(item,index)"
      >
        <span>{{item.name}}</span>
      </li>
    </ul>
  </div>
</template>

<script>
export default {
  name: "list",
  components: {},
  data() {
    return {
      List: [
        { name: "总的" },
        { name: "部分1" },
        { name: "部分2" },
        { name: "部分3" }
      ],
      colorIndex: -1
    };
  },
  mounted() {
      this.addActive()
  },
  methods: {
      /*给List的每一个对象添加active属性，需要用到this.$set（'对象','键值','value'） */
      addActive(){
        this.List.forEach(item=>{
            this.$set(item,'active',false)
        })
      },
    changeColor(item, index) {
      if(!item.active){
         item.active = true
      } else {
          item.active = false
      }
    }
  }
};
</script>

<style lang="less" scoped>
.list2 {
  width: 100px;
  ul {
    list-style: none;
    .activeColor {
      background-color: #f6fbff;
      color: #298adb;
    }
    li {
      cursor: pointer;
    }
  }
}
</style>

<template>
  <div class="list2">
    <ul>
      <li
        v-for="(item,index) in List"
        :key="index"
        :class="{activeColor:item.active}"
        @click="changeColor(item,index)"
      >
        <span>{{item.name}}</span>
      </li>
    </ul>
  </div>
</template>

<script>
export default {
  name: "list",
  components: {},
  data() {
    return {
      List: [
        { name: "总的" },
        { name: "部分1" },
        { name: "部分2" },
        { name: "部分3" }
      ],
      colorIndex: -1
    };
  },
  mounted() {
    this.addActive();
  },
  methods: {
    /*给List的每一个对象添加active属性，需要用到this.$set（'对象','键值','value'） */
    addActive() {
      this.List.forEach(item => {
        this.$set(item, "active", false);
      });
    },
    changeColor(item, index) {
      if (index === 0) {
        this.List.forEach(item => {
          item.active = false;
        });
      } else {
        this.List[0].active = false;
      }
      if (!item.active) {
        item.active = true;
      } else {
        item.active = false;
      }
    }
  }
};
</script>

<style lang="less" scoped>
.list2 {
  width: 100px;
  ul {
    list-style: none;
    .activeColor {
      background-color: #f6fbff;
      color: #298adb;
    }
    li {
      cursor: pointer;
    }
  }
}
</style>