element的tree树，样式连接线与文本溢出隐藏

效果图

html代码

<el-tree
          class="tree-line"
          :data="filteredTreeData"
          :props="{
            children: 'children',
            label: 'projectName',
          }"
          node-key="id"
        >
          <span class="custom-tree-node" :title="node.label" slot-scope="{ node, data }">
            <span>{{ node.label }}</span>
          </span>
        </el-tree>

css代码

.tree-line {
  .custom-tree-node {
    overflow: hidden;
    white-space: nowrap;
    text-overflow: ellipsis;
  }
  ::v-deep .el-tree-node {
    position: relative;
    // padding-left: 16px; // 缩进量
  }
  ::v-deep .el-tree-node__children {
    padding-left: 16px; // 缩进量
  }
  ::v-deep .el-tree-node__content .is-leaf {
    display: none;
  }
  // 竖线
  ::v-deep .el-tree-node::before {
    content: '';
    height: 100%;
    width: 1px;
    position: absolute;
    left: -3px;
    top: -26px;
    border-width: 1px;
    border-left: 1px dashed #7c7c7c;
  }
  // 当前层最后⼀个节点的竖线⾼度固定
  ::v-deep .el-tree-node:last-child::before {
    height: 38px; // 可以⾃⼰调节到合适数值
  }
  // 横线
  ::v-deep .el-tree-node::after {
    content: '';
    width: 24px;
    height: 20px;
    position: absolute;
    left: -3px;
    top: 12px;
    border-width: 1px;
    border-top: 1px dashed #7c7c7c;
  }
  // 去掉最顶层的虚线，放最下⾯样式才不会被上⾯的覆盖了
  & > ::v-deep .el-tree-node::after {
    border-top: none;
  }
  & > ::v-deep .el-tree-node::before {
    border-left: none;
  }
  // 展开关闭的icon
  ::v-deep .el-tree-node__expand-icon {
    font-size: 16px;
    color: rgba(0, 0, 0, 0.65);
    // 叶⼦节点（⽆⼦节点）
    ::v-deep &.is-leaf {
      color: transparent;
      // display: none; // 也可以去掉
    }
  }
}

还有一种方法，这个只有文本溢出

.tree-line {
	:deep(.el-tree-node__content) {
		width: 250px;
		overflow: hidden;
		white-space: nowrap;
		text-overflow: ellipsis;
		display: block;
		box-sizing: border-box;
	}
}