Different electron .html files in one

I need to somehow import a lot of html pages into one in electron(im using w2ui layout).

I have tried:

<iframe src="../map/index.html"></iframe>

but it does not work:

<script>require('./index.js');</script>

(Uncaught ReferenceError: require is not defined at index.html:15)

I NEED HELP!!

via Qoutroy