JSFiddle - React, Tailwind, and code Playground

by Denis

HTML

<ul>
    <li class="list"><span id="1">11111</span></li>
    <li class="list"><span id="2">22222</span></li>
    <li class="list"><span id="3">33333</span></li>
    <li class="list"><span id="4">44444</span></li>
</ul>
<div id="res"></div>

JavaScript

$(".list").data({'title': 'blabla'});
var n = 0;
$('.list').each(function(){
    if($(this).data('title') == 'blabla'){
        n++;
    }    
});

$('#res').text('Объектов со значением "blabla": ' + n);