点击弹出 +1放大效果

<script>
         (function ($) {
            $.extend({
                tipsBox: function (options) {
                    options = $.extend({
                        obj: null,  //jq对象，要在那个html标签上显示
                        str: "+1",  //字符串，要显示的内容;也可以传一段html，如: "<b style='font-family:Microsoft YaHei;'>+1</b>"
                        startSize: "12px",  //动画开始的文字大小
                        endSize: "30px",    //动画结束的文字大小
                        interval: 600,  //动画时间间隔
                        color: "red",    //文字颜色
                        callback: function () { }    //回调函数
                    }, options);
                    $("body").append("<span class='num'>" + options.str + "</span>");
                    var box = $(".num");
                    var left = options.obj.offset().left + options.obj.width() / 2;
                    var top = options.obj.offset().top - options.obj.height();
                    box.css({
                        "position": "absolute",
                        "left": left + "px",
                        "top": top + "px",
                        "z-index": 9999,
                        "font-size": options.startSize,
                        "line-height": options.endSize,
                        "color": options.color
                    });
                    box.animate({
                        "font-size": options.endSize,
                        "opacity": "0",
                        "top": top - parseInt(options.endSize) + "px"
                    }, options.interval, function () {
                        box.remove();
                        options.callback();
                    });
                }
            });
        })(jQuery);
    </script>
    <script>
        $(function () {
            $("#btn").click(function () {
                $.tipsBox({
                    obj: $(this),
                    str: "+1",
                    callback: function () {
                        //alert(5);
                    }
                });
            });
        });
    </script>