var city = new Vue({     el:'.city',     data:{         choices:[             {cities:'北京'},             {cities:'上海'},             {cities:'福州'},             {cities:'廣州'},             {cities:'青島'}         ]     },     methods:{         changeCity:function(){             $(this).css('color','red').siblings().css('color','');  //問題在這里，這里的this好像不是指向點擊的那個元素，好像是指向vue里面的，該怎么辦？         }     }      });<p class="city">    切換城市：     <a href="#" v-on:click="changeCity"  v-for="item in choices">     {{item.cities}}      </a> </p>