A less messy-looking option is using template strings:
var a = `<a href="${value.webLink}">${value.linkText}</a>`
Also not that you shouldn’t use <br>
there. Semantically it would make way more sense to have the HTML be
<div class="dropdown">
<button class="dropbtn">Quick Links</button>
<ul class="dropdown-content">
<li><a href="http:/example1.com/home">Example 1</a></li>
<li><a href="https://www.example2.com">Example 2</a></li>
<li><a href="https://www.example3.com">Example 3</a></li>
<li><a href="https://example4.com">Example 4</a></li>
</ul>
</div>
and let CSS do the formatting (=> display
)–even if you don’t use the list approach.