JSFiddle - React, Tailwind, and code Playground

HTML

<ul>
 <li class="email"><a href="mailto:[email protected]">[email protected]</a></li>
 <li class="email"><a href="mailto:[email protected]">xxx</a></li>
</ul>

JavaScript

var elems = document.querySelectorAll('.email');

for(var i = 0; i < elems.length; i++) {
    var elem = elems[i];

    alert('gggg'+elem.firstChild);
   // alert(elem.firstChild.getAttribute('href').substr(7));
}