因需要一种滑动显示内容，并且带可拖动的进度条，即下面这种效果
找了很多插件，总有地方不能满足需求。于是决定自己手写，下面为完整源码：
swiper.js
1 $.swiperCalculator = function (wrap, drag) {
2 this.wrap = wrap;
3 this.drag = drag;
4 this.dWidth = drag.width();
5 this.pWidth = drag.parent().width() - drag.width();
6 this.lWidth = wrap.children().outerWidth(true);
7 this.wWidth = wrap.parent().width();
8 this.num = wrap.children().length - 1;
9 }
10 $.extend($.swiperCalculator.prototype, {
11 setPostion: function (wrapX, dragX) {
12 this.wrap.css('transform', 'translate3d(' + wrapX + 'px, 0px, 0px)');
13 if (dragX < 0) dragX = 0;
14 if (dragX > this.pWidth) dragX = this.pWidth;
15 this.drag.css('left', dragX + 'px');
16 this.drag.parent().siblings('.pro-val').html(parseInt(dragX / this.pWidth * 100) + '%');
17 this.drag.siblings('.pro-bar').css('width', (dragX + this.dWidth) + 'px');
18 },
19 initPostion: function (i) {
20 let wrapX, dragX;
21 dragX = i * this.pWidth / this.num;
22 if (i == 0) wrapX = 0;
23 else if (i == this.num) wrapX = this.wWidth - (this.num + 1) * this.lWidth - 15;
24 else wrapX = dragX - i * this.lWidth - 5;
25 this.wrap.css('transition-duration', '0.3s').children('li').removeClass('active').eq(i).addClass('active');
26 this.drag.css('transition-duration', '0.3s');
27
28 this.setPostion(wrapX, dragX);
29 }
30 });
31
32 let $element, posX, isTouched = false;
33
34 $.fn.extend({
35 swiper: function () {
36 let $wrap = $(this).find('.wrapper ul');
37 let $li = $wrap.children('li');
38 $wrap.css('width', ($li.length + 1) * $li.outerWidth(true) + 'px').mousedown(function (e) {
39 isTouched = true;
40 if (e.preventDefault) e.preventDefault();
41 else e.returnValue = false;
42
43 posX = e.pageX;
44 $element = $(this);
45 });
46 $(this).find('.drag').mousedown(function (e) {
47 isTouched = true;
48 if (e.preventDefault) e.preventDefault();
49 else e.returnValue = false;
50
51 posX = e.pageX;
52 $element = $(this);
53 })
54 return $(this);
55 },
56 mouseMove: function (x) {
57 let $p = $(this).closest('.swiper')
58 let $wrap = $p.find('.wrapper ul');
59 let $drag = $p.find('.drag');
60
61 let sc = new $.swiperCalculator($wrap, $drag);
62 let num = sc.num + 1;
63 let dragX = $drag.position().left;
64 if (x == 0) {
65 let i = Math.round(dragX / sc.pWidth * (num - 1));
66 sc.initPostion(i);
67 } else {
68 let wrapX;
69 if ($(this).is($drag)) {
70 wrapX = -1 * x / sc.pWidth * num * sc.lWidth;
71 } else {
72 wrapX = x;
73 x = wrapX / (num * sc.lWidth) * -sc.pWidth;
74 }
75 wrapX += parseFloat($wrap.css("transform").match(/matrix\(([^)]+)\)/)[1].split(", ")[4]);
76 dragX += x;
77
78 $wrap.css('transition-duration', '0s');
79 $drag.css('transition-duration', '0s');
80 sc.setPostion(wrapX, dragX);
81 }
82 }
83 })
84
85 $(document).mousemove(function (e) {
86 if (!isTouched) return;
87 if (e.preventDefault) e.preventDefault();
88 else e.returnValue = false;
89
90 $element.mouseMove(e.pageX - posX)
91 posX = e.pageX;
92 }).mouseup(function (e) {
93 if (!isTouched) return;
94 isTouched = false;
95
96 $element.mouseMove(0);
97 });
test.html
1 <!DOCTYPE html
2 PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
3 <html xmlns="http://www.w3.org/1999/xhtml">
4
5 <head>
6 <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
7 <title>XXX</title>
8 <style>
9 .wrapper{width: 885px; overflow: hidden;background: #fff; padding: 10px 0;}
10 .wrapper ul{transform: translate3d(0px, 0px, 0px);}
11 .wrapper li{float: left; width: 120px; height: 121px; margin: 5px; padding: 10px; text-align: center; box-shadow: 0 0 0 1px rgba(0,0,0,.05), 0 2px 3px rgba(0,0,0,.1);;border-radius: 6px;}
12 .wrapper li.active{box-shadow:0 0 0 1px rgba(0,0,0,.05),0 2px 4px 5px rgba(0,0,0,.14);}
13 .wrapper li.end{line-height: 120px;}
14 .wrapper li img{width: 100px; height: 100px;}
15 .progress{position: relative;float: left;width: 755px;height: 10px; margin: 10px 0; border-radius: 4px; background-color: #e6e7e9;}
16 .pro-bar{height: 10px;background-color: #2fb344;border-radius: 4px;}
17 .drag{position: absolute; top:-10px;left:0;}
18 .txt{float: left;font-size: 16px; color: #f76707; line-height: 30px; margin-left: 10px;}
19 .pro-txt{width: 45px;}
20 </style>
21 </head>
22
23 <body>
24 <div class="swiper">
25 <div class="wrapper">
26 <ul>
27 <li>
28 <img src="xxxx.jpg">
29 <p>第1张图</p>
30 </li>
31 <li>
32 <img src="xxxx.jpg">
33 <p>第2张图</p>
34 </li>
35 <li>
36 <img src="xxxx.jpg">
37 <p>第3张图</p>
38 </li>
39 <li>
40 <img src="xxxx.jpg">
41 <p>第4张图</p>
42 </li>
43 。
44 。
45 。
46 <li class="end">END</li>
47 </ul>
48 </div>
49 <div>
50 <div class="txt pro-txt">进度</div>
51 <div class="progress">
52 <div class="pro-bar"></div>
53 <div class="drag"><img src="yyyy.png"></div>
54 </div>
55 <div class="txt pro-val"></div>
56 </div>
57 </div>
58
59 <script type="text/javascript" src="/js/jquery18.js" charset="utf-8"></script>
60 <script type='text/javascript' src='/js/swiper.js'></script>
61 <script type="text/javascript">
62 $('.swiper').swiper();
63 //默认选中第4幅图，也可不用
64 let sc = new $.swiperCalculator($('.wrapper ul'), $('.drag'));
65 sc.initPostion(3);
66 </script>
67 </body>
68
69 </html>
标签：插件,进度条,wrapX,jq,width,drag,let,wrap,dragX From： https://www.cnblogs.com/desertion/p/17926592.html