After running nuxt generate operation, the page of index.html can load correctly. But its JS dependencies aren't working unless the components locate in the layouts folder. Finally, if the version is oldest, it will work normally.
<!--cmty--><!--cmty_prevent_hook--><div align="right"><sub><em>This question is available on <a href="https://nuxtjs.cmty.io">Nuxt.js</a> community (<a href="https://nuxtjs.cmty.io/nuxt/nuxt.js/issues/c1638">#c1638</a>)</em></sub></div>