JSFiddle - React, Tailwind, and code Playground
HTML
<a href="#">HAS LINK</a>
<a>DOES NOT</a>
<a>DOES NOT</a>
<a>DOES NOT</a>
<a>DOES NOT</a>
<a>DOES NOT</a>
<a>DOES NOT</a>
JavaScript
$("a:not([href])").attr("href", "#")
<a href="#">HAS LINK</a>
<a>DOES NOT</a>
<a>DOES NOT</a>
<a>DOES NOT</a>
<a>DOES NOT</a>
<a>DOES NOT</a>
<a>DOES NOT</a>
$("a:not([href])").attr("href", "#")