<span v-for="(n,nav) in floorList" data-id="{{nav.itemId}}" v-on:click="getId($event)">{{nav.floorTitle}}</span>
//js代码
function scrollTo(event){
var target = event.target || window.event.srcElement,
//获取对应元素的id值
id = target.getAttribute('data-id');
console.log(id);
}