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>