(function( $ ){
  "use strict";

  $.fn.countup = function( options ) {

    // defaults
    var settings = $.extend({
        'time': 2000,
        'delay': 10
    }, options);

    return this.each(function(){

        // store the object
        var $this = $(this);
        var $settings = settings;

        var counterupper = function() {
            if(!$this.data('counterupto')) {
                $this.data('counterupto',$this.text());
            }
            var time = parseint($this.data("counter-time")) > 0 ? parseint($this.data("counter-time")) : $settings.time;
            var delay = parseint($this.data("counter-delay")) > 0 ? parseint($this.data("counter-delay")) : $settings.delay;
            var divisions = time / delay;
            var num = $this.data('counterupto');
            var nums = [num];
            var iscomma = /[0-9]+,[0-9]+/.test(num);
            num = num.replace(/,/g, '');
            var isint = /^[0-9]+$/.test(num);
            var isfloat = /^[0-9]+\.[0-9]+$/.test(num);
            var decimalplaces = isfloat ? (num.split('.')[1] || []).length : 0;

            // generate list of incremental numbers to display
            for (var i = divisions; i >= 1; i--) {

                // preserve as int if input was int
                var newnum = parseint(math.round(num / divisions * i));

                // preserve float if input was float
                if (isfloat) {
                    newnum = parsefloat(num / divisions * i).tofixed(decimalplaces);
                }

                // preserve commas if input had commas
                if (iscomma) {
                    while (/(\d+)(\d{3})/.test(newnum.tostring())) {
                        newnum = newnum.tostring().replace(/(\d+)(\d{3})/, '$1'+','+'$2');
                    }
                }

                nums.unshift(newnum);
            }

            $this.data('counterup-nums', nums);
            $this.text('0');

            // updates the number until we're done
            var f = function() {
                if ($this.data('counterup-nums')) { //加个这个判断
                    $this.text($this.data('counterup-nums').shift());
                    if ($this.data('counterup-nums').length) {
                        settimeout($this.data('counterup-func'),delay);
                    } else {
                        delete $this.data('counterup-nums');
                        $this.data('counterup-nums', null);
                        $this.data('counterup-func', null);
                    }
                }
            };
            $this.data('counterup-func', f);

            // start the count up
            settimeout($this.data('counterup-func'),delay);
        };

        // perform counts when the element gets into view
        $this.waypoint(counterupper, { offset: '100%', triggeronce: true });
    });

  };

})( jquery );

$(function () {
  $('.counter').countup({
      delay: 10,
      time: 1000
  });
})