SO Chatbot Auto remove command

js.js

(function() {
    "use strict";
    var chat = document.getElementById('chat');
 
    function parseNode(node) {
        if (node.classList && node.classList.contains('message') && !node.classList.contains('pending')) {
            if( $(node).parents('.mine').length ) {
                var prefix = $(node).find('.content').text().slice(0,3);
                if( prefix !== '!!>' && prefix.indexOf('!!') === 0 ) {
                    // testing shows this needs a timeout to be reliable. 
                    setTimeout(function() { $.post('/messages/' +  node.id.split('-')[1] + '/delete', fkey()) }, 10);
                }
            }
        }
    }
    [].forEach.call(chat.querySelectorAll('.user-container .message'), parseNode);
    new MutationObserver(function(records) {
        records.forEach(function(record) {
            [].forEach.call(record.addedNodes, parseNode);
        });
    }).observe(chat, {
        childList: true,
        subtree: true
    });
}());