vue 循環根據index動態綁定css樣式

1:html:

<ul>
        <li v-for="(item,index) in icon_list" :key="index"  @click="changeClass(index,item.path)">
          <router-link :to="item.path"   :class="{ 'active-class': nowIndex === index }">
            <img :src="item.icon" alt="">
            <span>{{item.text}}</span>
          </router-link>

        </li>
</ul>

2:js:

export default {
  name: 'Partice',
  data () {
    return {
    icon_list:[
              {
                icon: require('@/assets/check_in/有預訂icon.png'),
                text: '有預訂',
                type: 'ui-picture',
                path:'/check_in/check_in_home'
              },
              {
                icon: require('../../assets/check_in/無預訂icon.png'),
                text: '無預定',
                type: 'ui-picture',
                path:''
              },
              {
                icon: require('@/assets/check_in/團隊icon.png'),
                text: '團隊',
                type: 'ui-picture',
                path:''
              },
              {
                icon: require('@/assets/check_in/會員icon.png'),
                text: '會員',
                type: 'ui-picture',
                path:''
              },
              {
                icon: require('@/assets/check_in/協議icon.png'),
                text: '協議',
                type: 'ui-picture',
                path:''
              },
              {
                icon: require('@/assets/check_in/拼房icon.png'),
                text: '拼房',
                type: 'ui-picture',
                path:''
              }
            ],
            nowIndex: 0,
    }
  },
  methods: {
    changeClass (index) {
      this.nowIndex = index
    }
  }
} 

3:css:

 .active-class {
     span{
       color: #007BDB;
     }