[Vue warn]: Property "visible" must be accessed with "$data.visible" because properties starting with "$" or "_" are not proxied in the Vue instance to prevent conflicts with Vue internal.

　　vue + element = vue-element-admin

　　页面长时间后自动退出页面，控制台报了一串错误。

　　　　[Vue warn]: vue.runtime.esm.js:619 [Vue warn]: data functions should return an object:

　　　　[Vue warn]: Property "visible" must be accessed with "$data.visible" because properties starting with "$" or "_" are not proxied in the Vue instance to prevent conflicts with Vue internal.

　　　　[Vue warn]: vue.runtime.esm.js:619 [Vue warn]: Property "type" must be accessed with "$data.type"

　　　　[Vue warn]: Property "center" must be accessed with "$data.center"

　　　　[Vue warn]: vue.runtime.esm.js:619 [Vue warn]: Property "showClose" must be accessed with "$data.showClose"

　　　　[Vue warn]: Property "iconClass" must be accessed with "$data.iconClass"

　　　　[Vue warn]: Property "dangerouslyUseHTMLString" must be accessed with "$data.dangerouslyUseHTMLString"

　　　　[Vue warn]: Property "message" must be accessed with "$data.message"

　　　　[Vue warn]: Property "showClose" must be accessed with "$data.showClose"

　　　　...

　　解决办法：

修改permission文件中的
Message.error(error || 'Has Error')
为
Message.error(‘Has Error')