将绑定的数组userList:null改为userList:[]
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element ui中的cascader出现的报错：Error in callback for watcher "value": "TypeError: Cannot read property 'level' of null"
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Error in callback for watcher "value": "TypeError: Cannot read property 'level' of null"
element ui Cascader 级联选择器 关闭tag时报错 ：vue.runtime.esm.js?2b0e:619 [Vue warn]: Error in callback for watcher "value": "TypeError: Cannot read property 'level' of null"
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