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elementUI 复选框如何获取取消选中的值？

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elementUI 复选框如何获取取消选中的值？

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我点击取消马的复选框，复选框组@change给我返回的值是[Thx]的已选中数组。
标签还有复选框以外的值，所以tags标签的值不能直接等于复选框组v-model的值。
如果知道取消选中的值，可以splice删除。因为不知道取消选中的值，不知道如何下手。
大牛请指教


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复选框的全部数据为数组a，选择的值为b，a和b的差集就是取消的值了吧


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