JSFiddle - React, Tailwind, and code Playground

by mrnobody

HTML

<pre>
  1 строка
  2 строка
  3 строка
  4 строка
</pre>

JavaScript

$(document).ready(function () {
    var preText = $('pre').text(),
        arrPre = preText.split('\n'),
        arrPreNew = [];

    $.each(arrPre, function () {
        var trimLine = this.trim();
        if (trimLine !== '') { // Если строка пустая
            arrPreNew.push(trimLine);
        }
    });

    $('pre').html('<p>' + arrPreNew.join('</p><p>') + '</p>')
});