https://www.people.cn/img/LOCAL/2016/09/112887/js/jcarousellite.js

1(function($) {                                          // Compliant with jquery.noConflict()
2$.fn.jCarouselLite = function(o) {
3    o = $.extend({
4        btnPrev: null,
5        btnNext: null,
6        btnGo: null,
7        mouseWheel: false,
8        auto: null,
9
10        speed: 200,
11        easing: null,
12
13        vertical: false,
14        circular: true,
15        visible: 3,
16        start: 0,
17        scroll: 1,
18 		bttLi:false,
19        beforeStart: null,
20        afterEnd: null
21    }, o || {});
22
23    return this.each(function() {                           // Returns the element collection. Chainable.
24
25        var running = false, animCss=o.vertical?"top":"left", sizeCss=o.vertical?"height":"width";
26        var div = $(this), ul = $("ul", div), tLi = $("li", ul), tl = tLi.size(), v = o.visible;
27
28        if(o.circular) {
29            ul.prepend(tLi.slice(tl-v-1+1).clone())
30              .append(tLi.slice(0,v).clone());
31            o.start += v;
32        }
33
34        var li = $("li", ul), itemLength = li.size(), curr = o.start;
35        div.css("visibility", "visible");
36
37        li.css({overflow: "hidden", float: o.vertical ? "none" : "left"});
38        ul.css({margin: "0", padding: "0", position: "relative", "list-style-type": "none", "z-index": "1"});
39        div.css({overflow: "hidden", position: "relative", "z-index": "2", left: "0px"});
40
41        var liSize = o.vertical ? height(li) : width(li);   // Full li size(incl margin)-Used for animation
42        var ulSize = liSize * itemLength;                   // size of full ul(total length, not just for the visible items)
43        var divSize = liSize * v;                           // size of entire div(total length for just the visible items)
44
45        li.css({width: li.width(), height: li.height()});
46        ul.css(sizeCss, ulSize+"px").css(animCss, -(curr*liSize));
47
48        div.css(sizeCss, divSize+"px");

48                     // Width of the DIV. length of visible images
49
50	  if(o.bttLi){
51        tLi.each(function(index, obj) {
52            $(this).find('span em').prepend('<b>' + (index+1) + '</b>/' + tl+'&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;');
53        });
54		}
55        if(o.btnPrev)
56            $(o.btnPrev).click(function() {
57                return go(curr-o.scroll);
58            });
59
60        if(o.btnNext)
61            $(o.btnNext).click(function() {
62                return go(curr+o.scroll);
63            });
64
65        if(o.btnGo)
66            $.each(o.btnGo, function(i, val) {
67                $(val).click(function() {
68                    return go(o.circular ? o.visible+i : i);
69                });
70            });
71
72        if(o.mouseWheel && div.mousewheel)
73            div.mousewheel(function(e, d) {
74                return d>0 ? go(curr-o.scroll) : go(curr+o.scroll);
75            });
76
77        if(o.auto)
78            setInterval(function() {
79                go(curr+o.scroll);
80            }, o.auto+o.speed);
81
82        function vis() {
83            return li.slice(curr).slice(0,v);
84        };
85
86        function go(to) {
87            if(!running) {
88
89                if(o.beforeStart)
90                    o.beforeStart.call(this, vis());
91
92                if(o.circular) {            // If circular we are in first or last, then goto the other end
93                    if(to<=o.start-v-1) {           // If first, then goto last
94                        ul.css(animCss, -((itemLength-(v*2))*liSize)+"px");
95                        // If "scroll" > 1, then the "to" might not be equal to the condition; it can be lesser depending on the number of elements.
96                        curr = to==o.start-v-1 ? itemLength-(v*2)-1 : itemLength-(v*2)-o.scroll;
97                    } else if(to>=itemLength-v+1) { // If last, then goto first
98                        ul.css(animCss, -( (v) * liSize ) + "px" );
99                        // If "scroll" > 1, then the "to" might not be equal to the condition; it can be greater depending on the number of elements.
100                        curr = to==itemLength-v+1 ? v+1 : v+o.scroll;
101                    } else curr = to;
102                } else {                    // If non-circular and to points to first or last, we just return.
103                    if(to<0 || to>itemLength-v) return;
104                    else curr = to;
105                }                           // If neither overrides it, the curr will still be "to" and we can proceed.
106
107                running = true;
108
109                ul.animate(
110                    animCss == "left" ? { left: -(curr*liSize) } : { top: -(curr*liSize) } , o.speed, o.easing,
111                    function() {
112                        if(o.afterEnd)
113                            o.afterEnd.call(this, vis());
114                        running = false;
115                    }
116                );
117                // Disable buttons when the carousel reaches the last/first, and enable when not
118                if(!o.circular) {
119                    $(o.btnPrev + "," + o.btnNext).removeClass("disabled");
120                    $( (curr-o.scroll<0 && o.btnPrev)
121                        ||
122                       (curr+o.scroll > itemLength-v && o.btnNext)
123                        ||
124                       []
125                     ).addClass("disabled");
126                }
127
128            }
129            return false;
130        };
131    });
132};
133
134function css(el, prop) {
135    return parseInt($.css(el[0], prop)) || 0;
136};
137function width(el) {
138    return  el[0].offsetWidth + css(el, 'marginLeft') + css(el, 'marginRight');
139};
140function height(el) {
141    return el[0].offsetHeight + css(el, 'marginTop') + css(el, 'marginBottom');
142};
143
144})(jQuery);