文字滚动

(function ($) {
    $.fn.extend({
        rollList: function (option) {
            option = $.extend({
                direction: "up",/*up向上滚动，其他向下滚动*/
                step: 1,    /*滚动步长*/
                time: 50    /*time调整滚动的速度，数值越大，速度越慢*/
            }, option);
            var step_coe, scroll_coe, score_coe;
            if (option.direction == "up") { 
                step_coe = 1;
                scroll_coe = 1;
                score_coe = 1;
            } else {
                step_coe = -1;
                scroll_coe = -1;
                score_coe = 0;
            }
            return this.each(function () {
                var $this = $(this);
                var _this = this;
                var itemHeight;
                var temp = $("<DIV> </DIV>");
                $this.css("overflow", "hidden").children().appendTo(temp);
                $this.append(temp.clone(true)).append(temp);
                itemHeight = $this.children();
                itemHeight = itemHeight.eq(1).offset().top - itemHeight.eq(0).offset().top;
                while ($this.children(":last").offset().top - $this.offset().top <= $this.height())
                    $this.append(temp.clone(true));
                var roll;
                this.scrollTop = itemHeight * (1 - score_coe);
                roll = function () {
                    temp = setInterval(function () {
                        if (_this.scrollTop * scroll_coe >= itemHeight * score_coe) {
                            _this.scrollTop = (_this.scrollTop - itemHeight) * scroll_coe;
                        }
                        _this.scrollTop += option.step * step_coe;
                    }, option.time);
                }
                $this.hover(function () {
                    clearInterval(temp);
                }, function () {
                    roll();
                });
                roll();
            });
        }
    })
} (jQuery));

 

(function($){

	$.fn.myScroll = function(options){
	//默认配置
	var defaults = {
		speed:5,  //滚动速度,值越大速度越慢
		rowHeight:24 //每行的高度
	};
	
	var opts = $.extend({}, defaults, options),intId = [];
	
	function marquee(obj, step){
	
		obj.find("ul").animate({
			marginTop: '-=1'
		},0,function(){
				var s = Math.abs(parseInt($(this).css("margin-top")));
				if(s >= step){
					$(this).find("li").slice(0, 1).appendTo($(this));
					$(this).css("margin-top", 0);
				}
			});
		}
		
		this.each(function(i){
			var sh = opts["rowHeight"],speed = opts["speed"],_this = $(this);
			intId[i] = setInterval(function(){
				if(_this.find("ul").height()<=_this.height()){
					clearInterval(intId[i]);
				}else{
					marquee(_this, sh);
				}
			}, speed);

			_this.hover(function(){
				clearInterval(intId[i]);
			},function(){
				intId[i] = setInterval(function(){
					if(_this.find("ul").height()<=_this.height()){
						clearInterval(intId[i]);
					}else{
						marquee(_this, sh);
					}
				}, speed);
			});
		
		});

	}

})(jQuery);