使用iview的Cascader 级联选择报错：Error in callback for watcher "data": "TypeError: Cannot read property
项目中使用iview的Cascader 级联选择报错 控件地址：https://www.iviewui.com/components/cascader 在官网有这么一句话： 级联选择对数据有较严格要求，请参照示例的格式使用data，每项数据至少包含 value、label 两项，子集为 children，以此类推。 官网的一个实例 <template>
<Cascader :data="d
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