android show js script in browser

I have problem with my android application. I should to show javascript page in my app:

<a name="form1549752687" id="formAnchor1549752687"></a>
<script type="text/javascript" src="http://ift.tt/1A50Q0f"></script>
<script type="text/javascript">
EmbedManager.embed({
key: "http://ift.tt/1AxhcQT",
width: "100%"
});
</script>

I put this file in assets and load in webview, but webview cannot show page. I tried copied to external storage and then open it's in browser, but browser can't find file. Please help me!