JSFiddle - React, Tailwind, and code Playground

HTML

<body>
<div id="toSave">
    <table>
        <tr><td>1</td><td>2</td><td>3</td></tr>
        <tr><td>4</td><td>5</td><td>6</td></tr>
        <tr><td>7</td><td>8</td><td>9</td></tr>
        <tr><td>10</td><td>11</td><td>12</td></tr>
    </table>
</div>
<button id="SaveTable">Save</button>
    <div id="log"></div>
</body>

JavaScript

jQuery(document).ready(function(){
jQuery(document).on('click','#SaveTable', function(){
                    var TableText = jQuery('#toSave').html();
                    //alert(TableText);
                    jQuery.ajax({
                      url: "SaveTableScript.php", //скрипт который примет данные и обработает
                      type: "POST",
                        data: { action : 'saveTable', table: TableText }, //сами данные
                        dataType: "html"
                    }).done(function( msg ) {
                       jQuery( "#log" ).html( msg );
                    });
          });
});