JSFiddle - React, Tailwind, and code Playground

HTML

<ul class="datas">
    <li class="data-smh1">abc</li>
    <li class="data-smh1">dd</li>
    <li class="data-smh1">cc</li>
    <li class="data-sc33">abc</li>
    <li class="data-sc33">dd</li>
    <li class="data-nn61">abc</li>
    <li class="data-nn61">dd</li>
</ul>

JavaScript

$(document).ready(function(){
    var seen = {};
    $('.datas li').each(function(){
    //alert($(this).text());
    var txt = $(this).attr('class');
     if (seen[txt])
        $(this).remove();
    else
        seen[txt] = true;
        
    })
    
});