vue中prop父子嵌套多層傳值報錯解決

使用prop嵌套多層傳值時報錯

[Vue warn]: Avoid mutating a prop directly since the value will be overwritten whenever the parent component re-renders. Instead, use a data or computed property based on the prop's value.

解決辦法：使用中間變量myshow，在watch中間監聽變化通知爺爺組件