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$(".countchars").each(function () {
    var length = $(this).val().length;
    $(this).parent().find('#charlength').html('<b>' + length + '</b>');
    $(this).keyup(function () {
        var new_length = $(this).val().length;
        $(this).parent().find('#charlength').html('<b>' + new_length + '</b>');
        if (new_length == "140") {
            $('#charlength').css('background', 'red');
            $('#charlength').css('color', '#000000');
        }
    });
});