记录一下留用，有错误请指正。

效果图如下：

自定义图标及指引线

代码：

<div class="head-container" style="margin-left: -15px;"><el-tree icon-class="none"style="height:100%; overflow-y: hidden;"node-key="id"class="tree-line":data="deptOptions":props="defaultProps":expand-on-click-node="false":filter-node-method="filterNode"ref="tree"default-expand-allhighlight-current@node-click="handleNodeClick"><span class="custom-icon" slot-scope="{ node,data }" :style="getStyle(node)"><span :class="getIconClass(node)" :style="getIconStyle(node)" v-if="node.data.children.length!==0" @click.stop="handleClick(node)"></span><span style="margin: 0px 5px 0px 15px;" v-else></span><i class="el-icon-house" v-if="node.level == 1"></i><i class="el-icon-folder" v-else-if="node.level == 2"></i><i class="el-icon-document" v-else-if="node.level == 3"></i><i class="el-icon-document-copy" v-else></i>{{ data.name }}</span></el-tree>
</div>

deptOptions: [],
defaultProps: {children: "children",label: "label",
},

js部分：

// 筛选节点
filterNode(value, data) {if (!value) return true;return data.label.indexOf(value) !== -1;
},
// 节点单击事件
handleNodeClick(data) {this.queryParams.deptId = data.id;this.handleQuery(); // 这里的需求是点击节点，查询对应节点下的数据，根据需求来写
},
handleClick(node) {node.expanded = !node.expanded
},
// 以下为样式，此章的关键部分
getStyle(node) {return node.level === 1 ? this.style : null
},
getIconStyle(node) {return node.level === 1 ? 'padding: 0px;border: 0.8px solid red;margin: 0px 5px 0px 5px;' : 'padding: 0px;border: 0.8px solid #36383d;margin: 0px 5px 0px 2px;'
},
getIconClass(node) {return node.expanded ? 'el-icon-minus' : 'el-icon-plus'
},

css样式：

.custom-icon {color: #36383d;font-size: 13px;margin-left: 5px;
}<style lang="scss">
.tree-line{.el-tree-node {position: relative;padding-left: 0px; // 缩进量}.el-tree-node__content{padding-left: 0px !important;}.el-tree-node__children {padding-left: 18px; // 缩进量}.el-tree-node__content>.el-tree-node__expand-icon {padding: 2px;margin: 0px 4px !important;}.theme_color_blue .el-tree-node__content>.el-tree-node__expand-icon {padding: 10px;}// 竖线.el-tree-node::before {content: "";height: 100%;width: 1px;position: absolute;left: 8px;top: -26px;border-width: 0.5px;border-left: 0.5px dashed #4386c6;}// 当前层最后一个节点的竖线高度固定.el-tree-node:last-child::before {height: 38px; // 可以自己调节到合适数值}// 横线.el-tree-node::after {content: "";width: 18px;height: 15px;position: absolute;left: 8px;top: 12px;border-width: 0.5px;border-top: 0.5px dashed #4386c6;}// 去掉最顶层的虚线，放最下面样式才不会被上面的覆盖了& > .el-tree-node::after {border-top: none;}& > .el-tree-node::before {border-left: none;}// 展开关闭的icon.el-tree-node__expand-icon{font-size: 16px;// 叶子节点（无子节点）&.is-leaf{color: transparent;// display: none; // 也可以去掉}}
}
</style>