Vue-在一个固定的盒子里，内容列表滚动加载更多

蓝色圈中的div,高度固定，红框圈中的时ul-li，滚动可加载更多；
源码如下：

<div class="index_mode4" v-if="hasData">
    <div class="index_mode4_title">
    	<h2>最近访客</h2>
    	<span>记录当天最新访问次数</span>
    </div>
    <div class="scrolllistBox" @scroll="scrollEvent">
        <ul class="list_ul"  :scrollTopForApp="scrollTopForApp">
                <li :class="item.time.substring(0,10)==nowTime?'timenow':''" v-for="item in typeData1" :key="item.id" v-if="item.data.length>0">
        	   <p class="time"><span>{{item.time}}</span></p>
        	   <div class="ullist2">
            		<div class="userinfo" v-for="item2 in item.data">
            			<span class="userhead"><img :src="item2.avatar"/></span>
            			 <span class="username">{{item2.nickname}}</span>
            			 <a :href="'userinfo.html?openid='+item2.openid" class="goIntime">浏览过{{item2.num}}次</a>
            		</div>
        	   </div>
        	</li>
       </ul>
        <p class="overData">到底咯~</p>
   </div>
</div>

 scrollEvent(e) {
         // 获取滚动时的高度
        heightAll=e.target.scrollHeight;
        this.scrollTopForApp = e.target.scrollTop || 0;
        if(this.scrollTopForApp + 500 > heightAll&&this.ishaveData==1){
            //执行列表加载更多功能
       }
   }