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epubjs的ready函数回调后不能提取出数据

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epubjs的ready函数回调后不能提取出数据

epubjs中的book对象的ready函数执行后返回一个promise对象，我在then的回调函数中想把book对象中的navigation存储在本地变量中，但是并没有赋值，我在外边打印还是一个空对象。。。
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有没有挖过epubjs坑的大佬解答一下这是什么原因，谢谢大佬


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因为外边那个会先执行，那时候还没有赋值，先了解下事件循环的相关知识嗯


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