Untitled

<body>
    <referenceContainer name="before_body_end">
        <script src="ABC_Example::js/jquery.js" />
        <script src="ABC_Example::js/custom.js"/>
    </referenceContainer>
</body>

<referenceContainer name="before.body.end">
    <block class="MagentoFrameworkViewElementText" name="exampleScript">
        <arguments>
            <argument name="text" xsi:type="string"><![CDATA[<script type="text/javascript" src="//www.example.com/example-script.js"></script>]]></argument>
        </arguments>
    </block>
</referenceContainer>

<referenceContainer name="before.body.end">
        <block class="MagentoFrameworkViewElementTemplate" template="Namespace_Modulename::before.phtml" name="before_body_js"/>
</referenceContainer>

<script src="your js path" />