实现的效果如下：

1.el-table和右键菜单视图代码

@row-contextmenu="rightClick"是右键点击事件

@row-click="clickTableRow"是每行单击事件

<el-table
    border
    :data="connectList"
    @row-contextmenu="rightClick"
    @row-click="clickTableRow"
>
  <el-table-column label="ID" align="center" width="180" prop="id"/>
  <el-table-column label="目标" align="center" prop="url" :show-overflow-tooltip="true"/>
  <el-table-column label="修改时间" align="center" width="180" sortable prop="updatatime"/>
  <el-table-column label="盘符" align="center" width="60" prop="drive"/>
</el-table>

<!-- 右键菜单 -->
<div id="menu" class="menuDiv">
  <ul class="menuUl">
    <li
        v-for="(item, index) in menus"
        :key="index"
        @click.stop="infoClick(index)"
    >
      {{ item.name }}
    </li>
  </ul>
</div>

2.js方法代码

data() {
 return {
	//右键菜单
   menus: [
     { name: '编辑webshell', operType: 1 },
     { name: '删除webshell', operType: 2 },
     { name: '虚拟终端', operType: 3 },
     { name: '文件管理', operType: 4 }
   ]
 }
// methods 部分：
// table的右键点击当前行事件
rightClick(row, column, event) {
  let menu = document.querySelector("#menu");
  //阻止元素发生默认的行为
  event.preventDefault();
  // 根据事件对象中鼠标点击的位置，进行定位
  menu.style.left = event.clientX + 10 + "px";
  menu.style.top = event.clientY - 30 + "px";
  // 改变自定义菜单的隐藏与显示
  menu.style.display = "block";
  menu.style.zIndex = 1000;
},
 // table的左键点击当前行事件
clickTableRow(row, column, event) {
  let menu = document.querySelector("#menu");
  menu.style.display = "none";
},
// 自定义菜单的点击事件
infoClick(index) {
  if (index === 0) {
  // do something
  }
  let menu = document.querySelector("#menu");
  menu.style.display = "none";
},

3.css样式代码

.menuDiv {
  display: none;
  position: absolute;

  .menuUl {
    height: auto;
    width: auto;
    font-size: 14px;
    text-align: left;
    border-radius: 3px;
    border: none;
    background-color: #c4c4c4;
    color: #fff;
    list-style: none;
    padding: 0 10px;

    li {
      width: 140px;
      height: 35px;
      line-height: 35px;
      cursor: pointer;
      border-bottom: 1px solid rgba(255, 255, 255, 0.47);

      &:hover {
        // background-color: rgb(26, 117, 158);
        color: rgb(54, 138, 175);
      }
    }
  }
}