试试这个：

Try this:

$(document).on('click','button.btn',function(e) { 
    //you will trigger this function when you click a button
    //this will select the parent, i.e., the form
    var form = $(this).parent();

    var data = form.serialize();
    $.post('game/write.php', data, function(response) {
        console.log(response);
        $('#power').replaceWith(response);
    });
    return false;
});