title: Cannot read property 'requestContent' of undefined. Epubjs
body: <p>I used Epubjs. But when I run the application. It turns out &quot;Cannot read property 'requestContent' of undefined&quot;. Maybe it is about Asynchronous loading.`
  // @ is an alias to /src</p>
  <pre><code>import Epub from 'epubjs'
  
  global.ePub = Epub
  export default {
    name: 'home',
    mounted () {
      this.book = new Epub('/public/东京暗鸦_qinkan.net.epub')
      this.book.renderTo('read', {
        width: window.innerWidth,
        height: window.innerHeight
      })
    }
  }
  &lt;/script&gt;`
  </code></pre>