Check out example codes for "how to load css background image pre". It will help you in understanding the concepts better.

Code Example 1

div#preload {
    display: none;
}

Code Example 2

<div id="preload">
<img src="/img/open-source/amplitudejs/repeat-off.svg" />
<img src="/img/open-source/amplitudejs/repeat-on.svg" />
<img src="/img/open-source/amplitudejs/prev.svg" />
<img src="/img/open-source/amplitudejs/play.svg" />
<img src="/img/open-source/amplitudejs/pause.svg" />
<img src="/img/open-source/amplitudejs/next.svg" />
<img src="/img/open-source/amplitudejs/shuffle-off.svg" />
<img src="/img/open-source/amplitudejs/shuffle-on.svg" />
<img src="/img/open-source/amplitudejs/list-play-light.png" />
<img src="/img/open-source/amplitudejs/list-play-hover.png" />
<img src="/img/open-source/amplitudejs/volume.svg" />
<img src="/img/open-source/amplitudejs/mute.svg" />
</div>

Learn ReactJs, React Native from akashmittal.com