elementui禁用树形结构全部复选框

需求：编辑回显数据后，禁用树形结构复选框，不可选中，无复选框也不可选中

<el-tabs v-model="activeName" @tab-click="handleClick" >
<el-tab-pane label="左侧复选框" name="user" :disabled="userdisabled">
<el-tree class="erTree" ref="tree" :data="trees" show-checkbox node-key="id" @check="handleNode" default-expand-all
:props="defaultProps" highlight-current :expand-on-click-node="autoNode">
</el-tree>
</el-tab-pane>
<el-tab-pane label="右侧无复选框" name="org" :disabled="orgdisabled"> //disabled阻断tab切换
<el-tree class="erTree" ref="tree1" :data="trees" node-key="id" @node-click="handleNodeClick" default-expand-all
:props="defaultProps" highlight-current :expand-on-click-node="autoNode">
<span class="el-tree-node__label" slot-scope="{ node, data }">
<span>
<i :class="node.icon"></i>{{ node.label }}
</span>
</span>
</el-tree>
</el-tab-pane>
</el-tabs>

//data-----------
defaultProps: {
label: 'name',
disabled: this.disabledFn,
},
//methods----------
disabledFn() {
if (this.dialogtitle == "编辑") {
return true
} else if (this.dialogtitle == "新建") {
return false
}
}