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Error in mounted hook: "TypeError: Cannot read property 'display' of undefined"

Error in mounted hook: "TypeError: Cannot read property 'display' of undefined"

可以打印出书籍,报这个错误,什么原因呢

https://img1.sycdn.imooc.com//5d4ea55e000188ca13510746.jpg

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Error in mounted hook: "TypeError: Cannot read property 'display' of undefined"

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