除了被点击对象

$("body").click(function (event) {
        var target = event.target;
        if ($(target).parents('.graytip').length == 0 && $(target).parents('.discuss_content').length == 0 && $(target).parents('#ulEmotionsList').length == 0 && $(target).parents('.discuss_ipt').length == 0) {
            $('.reply_box').slideUp('fast');
        }
    });