一、示例代码

<div
            style="height: 600px;overflow: auto"
            class="text item"
          >
            <el-tree
              ref="tree"
              :data="treeData"
              :props="defaultProps"
              class="filter-tree"
              node-key="id"
              default-expand-all
              @node-click="getTableData"
            >
              <template
                slot-scope="{node}"
                class="custom-tree-node"
              >
                <!--                <span>{{ node.label }}</span>-->
                <!--                <span v-show="!data.children">
                  <el-button type="text" size="mini" @click="() => crud.toAdd(data)">
                    新增
                  </el-button>
                </span>-->
                <span
                  v-if="node.label.length <= 10"
                  class="tree-text"
                > {{ node.label }}</span>
                <el-tooltip
                  v-else
                  effect="dark"
                  :content="node.label"
                  placement="top"
                >
                  <span class="tree-text"> {{ node.label }}</span>
                </el-tooltip>
              </template>
            </el-tree>
          </div>

二、关键代码

1. 树形代码

    <span
        v-if="node.label.length <= 10"
                  class="tree-text"
                > {{ node.label }}</span>
                <el-tooltip
                  v-else
                  effect="dark"
                  :content="node.label"
                  placement="top"
                >
                  <span class="tree-text"> {{ node.label }}</span>
                </el-tooltip>

2. 样式代码

.tree-text {
  text-overflow: ellipsis;
  overflow: hidden;
  white-space: nowrap;
  display: inline-block;
  min-width: 300px;
}

三、效果图