var queue = [];

function classM(text)
{
    queue.push(text);
    if (queue.length > 1) return;
    
    function start() {
        if (!queue.length) return;
      
        var elem = document.createElement('div');
        document.getElementById('div').appendChild(elem);
        
        var text = queue[0];
                    
        function writer(index) { 
            if (index >= text.length) {
                queue.splice(0, 1);
                start();
            } else {
                elem.innerHTML += text[index];
                setTimeout(function() { writer(index + 1); }, 20);
            }
        };
        writer(0);
    }
    start();
}