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el-tree 不设置复选框怎么设置禁用其中某项？？

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el-tree 不设置复选框怎么设置禁用其中某项？？

需求原因，需要用tree组件做下拉选框，怎么禁用掉其中某项呢？比如不能用本部门作为上级部门。
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