vue element tree自定义树,树节点过长显示…鼠标悬浮显示全部

核心代码就是标红的

<span
  slot-scope="{ node, data }"
  :treeid="data.treeid"
  :keyIndex="data.keyIndex"
  :id="getId(data.treeid)"
  class="span-ellipsis"
>
  <el-tooltip :class="nodeIcon(node, data)" effect="light" placement="top-start" :title="data.treename" :style="nodeStyle(node, data)">
      <span>{
  
  {data.treename}}</span>
      </el-tooltip>
</span>