基于vue中对鼠标划过事件的处理方式详解

<template>
 <el-table
 :data="tableData"
 stripe
 style="width: 100%">
 <el-table-column
  prop="pic"
  label="图片"
  width="180">
  <template slot-scope="scope">
   <div slot="wrapper" class="name-wrapper">
   <div class="img-mask" @click="toShowDialog(props.row)" :ref="'mask' + props.rowIndex">文字</div>
   <div @mouseover="changeMask(props.rowIndex)" @mouseout="changeMask(props.rowIndex)">
    <img src="...">
   </div>
   </div>
  </template>
 </el-table-column>
 </el-table>
</template>

...
changeMask(index) {
 let vm = this;
 let mask = vm.$refs['mask' + index];

 if(mask.style.display == 'none') {
 mask.style.display = 'block';
 }else {
 mask.style.display = 'none';
 }
}

.wrapper {
 position: relative;
 .img-mask {
 position: absolute;
 background: rgba(0, 0, 0, 0.5);
 z-index: 10;
 //设置left、right、、bottom的原因是使得遮罩层上的文字显示在该层的最中间
 left: 0;
 right: 0;
 : 0;
 bottom: 0;
 //透明度为0，则就是不可见
 opacity: 0;
 }
 &:hover {
 .img-mask {
  opacity: 1;
 }
 }
}

<ul>>
 <li class="" v-on:mouseover="changeActive($event)" v-on:mouseout="removeActive($event)"></li>
</ul>

methods:{
  // 鼠标移入加入class
  changeActive($event){
    $event.currentTarget.className="active";
  },
  removeActive($event){
    $event.currentTarget.className="";
  }
}