vue 点击谁 谁变色（添加class属性）改变当前元素样式

<style>

.con{ 

        color: red;

    } 

</style>

<ul id="app">

<li v-for='(item,index) in items'    @click="change(index)"   :class='{ active:index===number}'>        <!--通过切换索引值改变class-->

　　<span v-html="item.name"></span>

</li>

</ul>

<script> 

    new Vue({ 

            el: '#app', 

            data: {

                    number: 0,    //注意此处

                    items:[  {  name: "我是0", },  { name: "我是1"  },  {  name: "我是2"  }  ] 

                },

              methods: {   

                        change: function(index) {

                                    this.number= index;    //重要处

                        } 

                } 

}) 

</script>

参考文章：https://www.cnblogs.com/xueweijie/p/6861702.html