vue--点击当前增加class，其他删除class

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<div id="app">
<p v-for='(data,key,index) in datas' v-on:click="addClassFun(index)" v-bind:class='{class1:index==qwerqwre}'>{{data.data}}</p>
</div>

<script>
new Vue({
el: '#app',
data: {
datas: {
data1: {
data: "测试1",
ifAdd: 0
},
data2: {
data: "测试2",
ifAdd: 1
},
data3: {
data: "测试3",
ifAdd: 2
}
},
qwerqwre:"0"
},


methods: {
addClassFun: function(index) {
this.qwerqwre = index;
}
}
})
</script>