v-for列表实现选项卡切换进阶版

<div id="card">
    <div class="title">
        <span @click="num=key" :class="change(key)" v-for="title,key in title_list">{{title}}</span>
    </div>
    <div class="content">
        <span class="list" :class="change(key,‘active‘)" v-for="content,key in content_list">{{content}}</span>
    </div>
</div>

<script脚本代码>
    var card = new Vue({
        el:"#card",
        data:{
            num: 0,
            title_list:[
                "国内新闻",
                "国际新闻",
                "银河新闻"
            ],
            content_list:[
                "国内新闻列表",
                "国际新闻列表",
                "银河新闻列表"
            ]
        },
        methods:{
            change(data,style=‘current‘){
                if(this.num==data){
                    return style;
                }
            }
        }
    });
</script脚本代码>