<li>    <a href="#" @click.self="longPress($event)">        <img :src="$store.state.lazyload" data-src="/topic/green.png" onload="lzld(this)">    </a></li>longPress: function (e) {    console.log(e.target.tagName); // IMG}.list li{    width: (139rem/$num);    height: (160rem/$num);    border-radius: (5rem/$num);    display: inline-block;    text-align: center;    font-size: (20rem/$num);  }  .list li a{    color: #787878;    display: block;  }  .list li img{    width: (100rem/$num);    height: (100rem/$num);    margin: 0 auto (10rem/$num);  }如何讓longpress事件點擊到的是a？