//窗口显示才加载
	var wraptop = $(".index_about_num dl").offset().top;
	//alert(wraptop);

	var istrue = true;
		
		
	$(window).on("scroll",
	
	
	function() {
	    var s = $(window).scrolltop();
	
	    if (s > wraptop -1500 && istrue) {
	        $(".timer").each(count);
	        function count(a) {
	            var b = $(this);
	            a = $.extend({},
	            a || {},
	            b.data("counttooptions") || {});
	            b.countto(a)
	        };
	        istrue = false;
	    };
	})
	//设置计数
	$.fn.countto = function (options) {
		options = options || {};
		return $(this).each(function () {
			//当前元素的选项
			var settings = $.extend({}, $.fn.countto.defaults, {
				from:            $(this).data('from'),
				to:              $(this).data('to'),
				speed:           $(this).data('speed'),
				refreshinterval: $(this).data('refresh-interval'),
				decimals:        $(this).data('decimals')
			}, options);
			//更新值
			var loops = math.ceil(settings.speed / settings.refreshinterval),
			    increment = (settings.to - settings.from) / loops;
			//更改应用和变量
			var self = this,
			$self = $(this),
			loopcount = 0,
			value = settings.from,
			data = $self.data('countto') || {};
			$self.data('countto', data);
			//如果有间断，找到并清除
			if (data.interval) {
				clearinterval(data.interval);
			};
			data.interval = setinterval(updatetimer, settings.refreshinterval);
			//初始化起始值
			render(value);
			function updatetimer() {
				value += increment;
				loopcount++;
				render(value);
				if (typeof(settings.onupdate) == 'function') {
					settings.onupdate.call(self, value);
				}
				if (loopcount >= loops) {
					//移出间隔
					$self.removedata('countto');
					clearinterval(data.interval);
					value = settings.to;
					if (typeof(settings.oncomplete) == 'function') {
						settings.oncomplete.call(self, value);
					}
				}
			}
			function render(value) {
				var formattedvalue = settings.formatter.call(self, value, settings);
				$self.html(formattedvalue);
			}
			});
        };
        $.fn.countto.defaults={
        	from:0,               //数字开始的值
        	to:0,                 //数字结束的值
        	speed:1000,           //设置步长的时间
        	refreshinterval:100,  //隔间值
        	decimals:0,           //显示小位数
        	formatter: formatter, //渲染之前格式化
        	onupdate:null,        //每次更新前的回调方法
        	oncomplete:null       //完成更新的回调方法
        };
        function formatter(value, settings){
        	return value.tofixed(settings.decimals);
        }
        //自定义格式
        $('#count-number').data('counttooptions',{
        	formmatter:function(value, options){
        		return value.tofixed(options.decimals).replace(/\b(?=(?:\d{3})+(?!\d))/g, ',');
        	}
        });
        //定时器
        $('.timer').each(count);
        function count(options){
        	var $this=$(this);
        	options=$.extend({}, options||{}, $this.data('counttooptions')||{});
        	$this.countto(options);
        }