在 template 中

<div class="container">
  <el-tree :data="treeList" :props="defaultProps" accordion @node-click="handleNodeClick" />
</div>

在 script 中

treeList: [
  { id: "-1", label: "区域选择" },
  { id: "0", label: "全市" },
  {
    id: "1",
    label: "南明区",
    children: [{ id: "1-1", label: "花果园" }]
  },
  {
    id: "2",
    label: "观山湖区",
    children: [
      { id: "2-1", label: "长岭街道办" },
      { id: "2-2", label: "金阳街道办" },
      { id: "2-3", label: "金华镇" },
      { id: "2-4", label: "金华园街道办" }
    ]
  }
],
defaultProps: { children: "children", label: "label" }

handleNodeClick(e) {
  console.log(e.id);
}

在 style 中

.container {
  width: 200px;
}
.el-tree-node__content {
  padding: 5px 0;
  border: 1px solid #ebf0f3;
}
.el-tree-node.is-current > .el-tree-node__content .el-tree-node__expand-icon {
  color: #0c5cff;
}
.el-tree-node__content:hover {
  color: #0c5cff;
  background: #e0eaff;
}
.el-tree-node.is-current > .el-tree-node__content {
  color: #0c5cff;
  background-color: #e0eaff;
}
.el-tree-node__expand-icon.is-leaf {
  color: transparent !important;
}