jQuery 数字滚动插件

/***
 * jQuery plugin dBeat()
 * Function : 数字滚动
 * Version  : 0.3
 * Author   : Cymmint
 * Date     : 2015-02-13 10:50
 */
;(function($){
    //支持Firefox backgroundPosition plugin
    $.extend($.fx.step,{
        backgroundPosition: function(fx) {
            if (fx.pos === 0 && typeof fx.end == ‘string‘) {
                var start = $.css(fx.elem,‘backgroundPosition‘);
                start = toArray(start);
                fx.start = [start[0],start[2]];
                var end = toArray(fx.end);
                fx.end = [end[0],end[2]];
                fx.unit = [end[1],end[3]];
            }
            var nowPosX = [];
            nowPosX[0] = ((fx.end[0] - fx.start[0]) * fx.pos) + fx.start[0] + fx.unit[0];
            nowPosX[1] = ((fx.end[1] - fx.start[1]) * fx.pos) + fx.start[1] + fx.unit[1];
            fx.elem.style.backgroundPosition = nowPosX[0]+‘ ‘+nowPosX[1];
 
            function toArray(strg){
                strg = strg.replace(/left|top/g,‘0px‘);
                strg = strg.replace(/right|bottom/g,‘100%‘);
                strg = strg.replace(/([0-9\.]+)(\s|\)|$)/g,"$1px$2");
                var res = strg.match(/(-?[0-9\.]+)(px|\%|em|pt)\s(-?[0-9\.]+)(px|\%|em|pt)/);
                return [parseFloat(res[1],10),res[2],parseFloat(res[3],10),res[4]];
            }
        }
    });
 
    //digital beating plugin
    $.fn.dBeat = function(opts){
        var define = {
            loop   : true, //循环滚动|循环次数, [true|false|正整数]
            real   : true, //真实数据
            dec    : 0, //小数位数
            high   : 30, //数字行高,U.px
            range  : 1000, //自增区间, 当real为true时, range值被舍弃
            time   : 3000, //循环滚动间隔时间, U.ms
            speed  : 1000, //数字滚动速度,此参数必须小于time U.ms
            t_out  : 0 //清除循环
        };
 
        opts = $.extend({}, define, opts);
 
        var methods = {
            getNum : function(_this){ //Get data number
                var num = _this.data("num");
                num = isNaN(num) ? 0 : num*1;
                return num.toFixed(opts.dec);
            },
            getRandom : function() { //Random
                var r = opts.range == null || opts.range == "" || isNaN(opts.range) ? 1000 : opts.range;
                return Math.random() * (r + 1);
            },
            beat : function(_this){ //Number beating
                _this.find("i:not(‘.d, .e‘)").each(function(){
                    var self = $(this),
                        data = {};
 
                    if (navigator.userAgent.toLocaleLowerCase().match(/firefox/) != null) {
                        data.backgroundPosition = "0 -" + self.attr("num") * opts.high + "px";
                    } else {
                        data.backgroundPositionY = -self.attr("num") * opts.high;
                    }
                    self.animate(data, opts.speed);
                });
            },
            setLabel : function(_this, num){ //Set in the digital DOM
                var tag = _this.find("i"),
                    len = tag.length - num.length,
                    htm = "";
 
                if (len > 0) {
                    _this.find("i:lt("+ len +")").remove();
                    tag = _this.find("i");
                }
                len = tag.length;
 
                for (var i=num.length-1; i>=0; i--) {
                    if (len-- > 0) {
                        if (num.charAt(i) == ".") {
                            tag.eq(len).attr("num", 10);
                        } else {
                            if (num.charAt(i) == tag.eq(len).attr("num")) {
                                tag.eq(len).addClass("e");
                            } else {
                                tag.eq(len).attr("num", num.charAt(i));
                                tag.eq(len).removeClass("e");
                            }
                        }
                    } else {
                        if (num.charAt(i) == ".") {
                            htm = ‘<i class="d" num="10"></i>‘ + htm;
                        } else {
                            htm = ‘<i num="‘+ num.charAt(i) +‘"></i>‘ + htm;
                        }
                    }
                }
                _this.prepend(htm);
            },
            main : function(_this){
                var num = this.getNum(_this); //真实数据滚动
 
                if (!opts.real) { //伪数据滚动
                    num = (num*1 + this.getRandom()*1).toFixed(opts.dec);
                }
 
                _this.data("num", num);
                this.setLabel(_this, num);
                this.beat(_this);
                if (opts.real && typeof opts.data === "function") {
                    opts.data.call(_this);
                }
 
                if (opts.loop) {
                    opts.t_out = setTimeout(function(){
                        methods.main(_this);
                    }, opts.time);
                }
                if (/^\d+$/.test(opts.loop) && !--opts.loop) {
                    clearTimeout(opts.t_out);
                }
            }
        };
 
        return this.each(function(){
            var _this = $(this);
            methods.main(_this);
        });
    };
})(jQuery);