Comment basculer entre les styles dans vue

<p id="wrap" class="box">
  <p v-for="(list,index) in navLists" class="nav" :class="{ red:changeRed == index}" @click="reds(index)">{{list.text}}</p>
</p>

 *{
        padding: 0;margin: 0;
      }
      .box{
        height: 40px;
        background: cyan;
      }
      .nav{
        line-height: 40px;
        display: inline-block;
        margin-left: 100px;
        cursor: pointer;
      }
      .red{
        color: red;
      }

//前提是必须引入vuejs哦！
var vm = new Vue({
      el:"#wrap",
      data:{
        navLists:[
          {
            "text":"首页"           
          },
          {
            "text":"组件"           
          },
          {
            "text":"API"            
          },
          {
            "text":"我们"           
          }
        ],
        changeRed:0
      },
      methods:{
        reds:function(index){
          this.changeRed = index;
        }
      }
    });

:class="{active: isActive}"

class="[lineStyle(courseClick)]"
    lineStyle(isClick){
        if (isClick===true){
          return 'tab-items-current'
        }else {
          return 'class-tab-items'
        }
      }