【IScroll深入学习】解决IScroll疑难杂症

时间：2014-06-04 14:56:47 阅读：875 评论：0 收藏：0 [点我收藏+]

标签：des c style class blog code

前言

在去年，我们对IScroll的源码进行了学习，并且分离出了一段代码自己使用，在使用学习过程中发现几个致命问题：

① 光标移位

② 文本框找不到（先让文本框获取焦点，再滑动一下，输入文字便可重现）

③ 偶尔导致头部消失，头部可不是fixed哦

bubuko.com,布布扣

由于以上问题，加之去年我们团队的工作量极大，和中间一些组织架构调整，这个事情一直被放到了今天，心里一直对此耿耿于怀，因为IScroll让人忘不了的好处

小钗坚信，IScroll可以带来前端体验上的革命，因为他可以解决以下问题

区域滑动顺滑感的体验
解决fixed移位问题
解决动画过程中长短页的问题，并且可以优化view切换动画的顺畅度

我们不能因为一两个小问题而放弃如此牛逼的点子，所以我们要处理其中的问题，那么这些问题是否真的不可解决，而引起这些问题的原因又到底是什么，我们今天来一一探索

抽离IScroll

第一步依旧是抽离IScroll核心逻辑，我们这里先在简单层面上探究问题，以免被旁枝末节的BUG困扰，这里形成的一个库只支持纵向滚动，代码量比较少

bubuko.com,布布扣

Demo

核心代码

代码中引入了fastclick解决其移动端点击问题，demo效果在此：

http://sandbox.runjs.cn/show/xq2fbetv

基本代码出来了，我们现在来一个个埋坑，首先解决难的问题！

光标跳动/文本框消失

光标跳动是什么现象大家都知道了，至于导致的原因又我们测试下来，即可确定罪魁祸首为：transform，于是我们看看滑动过程中发生了什么

① 每次滑动会涉及到位置的变化

this._translate(0, newY);

② 每次变化会改变transform属性

 1 //移动x，y这里比较简单就不分离y了
 2 _translate: function (x, y) {
 3   this.scrollerStyle[utils.style.transform] = ‘translate(‘ + x + ‘px,‘ + y + ‘px)‘ + this.translateZ;
 4 
 5   this.x = x;
 6   this.y = y;
 7 
 8   if (this.options.scrollbars) {
 9     this.indicator.updatePosition();
10   }
11 
12 },

我们这里做一次剥离，将transform改成直接改变top值看看效果

this.scrollerStyle[‘top‘] = y + ‘px‘;

而事实证明，一旦去除transform属性，我们这里便不再有光标闪动的问题了。

更进一步的分析，实验，你会发现其实引起的原因是这句：

//       this.scrollerStyle[utils.style.transform] = ‘translate(‘ + x + ‘px,‘ + y + ‘px)‘ + this.translateZ;
       this.scrollerStyle[utils.style.transform] = ‘translate(‘ + x + ‘px,‘ + y + ‘px)‘ ;

没错，就是css3d加速引起的，他的优势是让动画变得顺畅，却不曾想到会引起文本框光标闪烁的问题

针对ios闪烁有一个神奇的属性是

-webkit-backface-visibility: hidden;

于是加入到，scroller元素上后观察之，无效，舍弃该方案再来就是一些怪办法了：

滑动隐藏虚拟键盘

文本获取焦点的情况下，会隐藏虚拟键盘，连焦点都没有了，这个问题自然不药而愈，于是我们只要滑动便让其失去焦点，这样似乎狡猾的绕过了这个问题

在touchmove逻辑处加入以下逻辑

 1 //暂时只考虑input问题，有效再扩展
 2 var el = document.activeElement;
 3 if (el.nodeName.toLowerCase() == ‘input‘) {
 4   el.blur();
 5   this.disable();
 6   setTimeout($.proxy(function () {
 7     this.enable();
 8   }, this), 250);
 9   return;
10 }

该方案最为简单粗暴，他在我们意图滑动时便直接导致虚拟键盘失效，从而根本不会滑动，便错过了光标跳动的问题

甚至，解决了由于滚动导致的文本框消失问题！！！

其中有一个250ms的延时，这个期间是虚拟键盘隐藏所用时间，这个时间段将不可对IScroll进行操作，该方案实验下来效果还行

其中这个延时在200-300之间比较符合人的操作习惯，不设置滚动区域会乱闪，取什么值各位自己去尝试，测试地址：

http://sandbox.runjs.cn/show/8nkmlmz5

这个方案是我觉得最优的方案，其是否接受还要看产品态度

死磕-重写_translate

_translate是IScroll滑动的总控，这里默认是使用transform进行移动，但若是获取焦点的情况下我们可以具有不一样的方案

在文本框具有焦点是，我们使用top代替transform！

PS：这是个烂方法不建议采用

 1 //移动x，y这里比较简单就不分离y了
 2 _translate: function (x, y) {
 3 
 4   var el = document.activeElement;
 5   if (el.nodeName.toLowerCase() == ‘input‘) {
 6     this.scrollerStyle[‘top‘] = y + ‘px‘;
 7   } else {
 8     this.scrollerStyle[utils.style.transform] = ‘translate(‘ + x + ‘px,‘ + y + ‘px)‘ + this.translateZ;
 9   }
10 
11   this.x = x;
12   this.y = y;
13 
14   if (this.options.scrollbars) {
15     this.indicator.updatePosition();
16   }
17 
18 },

该方案被测试确实可行，不会出现光标闪的现象，但是有一个问题却需要我们处理，便是一旦文本框失去焦点，我们要做top与transform的换算

所以这是一个烂方法！！！这里换算事实上也不难，就是将top值重新归还transform，但是整个这个逻辑却是让人觉得别扭

而且我们这里还需要一个定时器去做计算，判断何时文本框失去焦点，整个这个逻辑就是一个字坑！

 1 //移动x，y这里比较简单就不分离y了
 2 _translate: function (x, y) {
 3 
 4   var el = document.activeElement;
 5   if (el.nodeName.toLowerCase() == ‘input‘) {
 6     this.scrollerStyle[‘top‘] = y + ‘px‘;
 7 
 8     //便需要做距离换算相关清理，一旦文本框事情焦点，我们要做top值还原
 9     if (!this.TimerSrc) {
10       this.TimerSrc = setInterval($.proxy(function () {
11         var el = document.activeElement;
12         if (el.nodeName.toLowerCase() != ‘input‘) {
13 
14           pos = this.getComputedPosition();
15 
16           var top = $(scroller).css(‘top‘);
17           this.scrollerStyle[‘top‘] = ‘0px‘;
18           console.log(pos);
19 
20           var _x = Math.round(pos.x);
21           var _y = Math.round(pos.y);
22           _y = _y + parseInt(top);
23 
24           //移动过去
25           this._translate(_x, _y);
26 
27           clearInterval(this.TimerSrc);
28           this.TimerSrc = null;
29         }
30       }, this), 20);
31     }
32   } else {
33     this.scrollerStyle[utils.style.transform] = ‘translate(‘ + x + ‘px,‘ + y + ‘px)‘ + this.translateZ;
34   }
35 
36   this.x = x;
37   this.y = y;
38 
39   if (this.options.scrollbars) {
40     this.indicator.updatePosition();
41   }
42 
43 },

经测试，该代码可以解决光标跳动问题，但是坑不坑大家心里有数，一旦需要被迫使用定时器的地方，必定会有点坑！测试地址

http://sandbox.runjs.cn/show/v9pno9d8

死磕-文本框消失

文本框消息是由于滚动中产生动画，将文本框搞到区域外了，这个时候一旦我们输入文字，导致input change，系统便会自动将文本定位到中间，而出现文本不可见问题

该问题的处理最好的方案，依旧是方案一，若是这里要死磕，又会有许多问题，方案无非是给文本设置changed事件，或者定时器什么的，当变化时，自动将文本元素

至于IScroll可视区域，楼主这里就不献丑了，因为我基本决定使用方案一了。

步长移动

所谓步长移动便是我一次必须移动一定距离，这个与图片横向轮播功能有点类似，而这类需求在移动端数不胜数，那我们的IScroll应该如何处理才能加上这一伟大特性呢？

去看IScroll的源码，人家都已经实现了，居然人家都实现了，哎，但是我们这里不管他，照旧做我们的事情吧，加入步长功能

PS：这里有点小小的失落，我以为没有实现呢，这样我搞出来肯定没有官方的优雅了！

思路

思路其实很简单，我们若是设置了一个步长属性，暂时我们认为他是一个数字（其实可以是bool值，由库自己计算该值），然后每次移动时候便必须强制移动该属性的整数倍即可，比如：

1 var s = new IScroll({
2   wrapper: $(‘#wrapper‘),
3   scroller: $(‘#scroller‘),
4   setp: 40
5 });

这个便要求每次都得移动10px的步长，那么这个如何实现呢？其实实现点，依然是_translate处，我们这里需要一点处理

 1 //移动x，y这里比较简单就不分离y了
 2 _translate: function (x, y, isStep) {
 3 
 4   //处理步长
 5   if (this.options.setp && !isStep) {
 6     var flag2 = y > 0 ? 1 : -1; //这个会影响后面的计算结果
 7     var top = Math.abs(y);
 8     var mod = top % this.options.setp;
 9     top = (parseInt(top / this.options.setp) * this.options.setp + (mod > (this.options.setp/2) ? this.options.setp : 0)) * flag2;
10     y = top;
11   }
12 
13   this.scrollerStyle[utils.style.transform] = ‘translate(‘ + x + ‘px,‘ + y + ‘px)‘ + this.translateZ;
14 
15   this.x = x;
16   this.y = y;
17 
18   if (this.options.scrollbars) {
19     this.indicator.updatePosition();
20   }
21 
22 },

这样一改后，每次便要求移动40px的步长，当然，我这里代码写的不是太好，整个效果在此

这里唯一需要处理的就是touchmove了，每次move的时候，我们不应该对其进行步长控制，而后皆可以，这种控制步长的效果有什么用呢？请看这个例子：

双IScroll的问题

所谓双IScroll，便是一个页面出现了两个IScroll组件的问题，这个问题前段时间发生在了我们一个团队身上，其状况具体为

他在一个view上面有两个地方使用了IScroll，结果就是感觉滑动很卡，并且不能很好的定位原因，其实导致这个原因的主要因素是：

他将事件绑定到了document上，而不是具体包裹层元素上，这样的话，就算一个IScroll隐藏了，他滑动时候已经执行了两个逻辑，从而出现了卡的现象

当然，一个IScroll隐藏的话其实应该释放其中的事件句柄，当时他没有那么做，所以以后大家遇到对应的功能，需要将事件绑定对位置

我们这里举个例子：

  1 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
  2 <html xmlns="http://www.w3.org/1999/xhtml">
  3 <head>
  4   <title></title>
  5   <meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
  6   <meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=0, minimum-scale=1.0, maximum-scale=1.0">
  7   <meta name="keywords" content="" />
  8   <meta name="description" content="" />
  9   <meta name="robots" content="all" />
 10   <style type="text/css">
 11         
 12 /*reset*/
 13 body,div,dl,dt,dd,ul,ol,li,h1,h2,h3,h4,h5,h6,pre,code,form,fieldset,legend,input,textarea,p,blockquote,th,td,hr,button,article,aside,details,figcaption,figure,footer,header,hgroup,menu,nav,section{margin:0;padding:0}
 14 body,button,input,select,textarea{font:normal 14px/1.5 Tahoma,"Lucida Grande",Verdana,"Microsoft YaHei",hei;}
 15 article,aside,details,figcaption,figure,footer,header,hgroup,menu,nav,section,iframe{display:block;}
 16 h1,h2,h3,h4,h5,h6{font-size:100%;font-weight:500;}
 17 address,cite,dfn,em,var,i{font-style:normal;font-weight:normal;font-family:arial;}
 18 ul,ol{list-style:none}
 19 a{color:#000;text-decoration:none}
 20 a:hover{text-decoration:underline;-webkit-transition:color .2s linear;-moz-transition:color .2s linear;-ms-transition:color .2s linear;-o-transition:color .2s linear;transition:color .2s linear;}
 21 fieldset,img,button,input{border:0}
 22 button,input,select,textarea{font-size:100%}
 23 table{border-collapse:collapse;border-spacing:0}
 24 input[type="button"],input[type="submit"]{-webkit-appearance:none;}
 25 body{min-width:320px; background:#f5f5f5;overflow-x:hidden;-webkit-text-size-adjust:none;-webkit-tap-highlight-color:rgba(0,0,0,0);-webkit-font-smoothing:subpixel-antialiased;-moz-user-select:none;color:#000;}:focus{outline:none;}.clearfix:after{clear:both;content:‘.‘;display:block;height:0;visibility:hidden;line-height:0;}.clearfix{*zoom:1;}.fl{float:left;}.fr{float:right;}.clear{clear:both;}.overflow{overflow:hidden;}.ellips{white-space:nowrap; overflow:hidden; text-overflow:ellipsis;}.ellips_line2,.ellips_line3{display: -webkit-box;-webkit-box-orient: vertical;overflow: hidden;}.ellips_line2{-webkit-line-clamp:2;}.ellips_line3{-webkit-line-clamp:3;}.pos_rel{position:relative;}
 26 html,body,.h100{ height:100%; }
 27 dfn{color:#ff9913; font-size:12px; font-weight:normal;}
 28 /*-----------------------------------------common--------------------*/
 29 .i,.i_bef:before,.i_aft:after,.carlist li:before,.ok_crt:after{background:url(../img/style1/v2_bgs.png) no-repeat; background-size:175px 125px;}
 30 .i_bef:before,.i_aft:after,.carlist li:before{position: absolute;content: "";}
 31 .abs_size{-moz-box-sizing:border-box; -webkit-box-sizing:border-box; box-sizing:border-box;}
 32 .opacity{opacity:0.7; filter:alpha(opacity=70);}
 33 
 34 /*active*/
 35 .list_st_border li:active,.p_hinttxt:active,.search_cancel:active,.citylist dd:active{ background:#f8f8f8;}
 36 .btn_yellow:active{background:#eb840f;}
 37 
 38 /*layout*/
 39 .wrap{margin-top:48px;}
 40 .wrap_pb{margin-top:48px; padding-bottom:45px;}
 41 .p10{padding:10px;}
 42 .hm{text-align:center;}
 43 .break_all{word-break:break-all;}
 44 .fix_b{position:fixed; bottom:0; left:0;z-index:9999;}
 45 
 46 /*font bg color size*/
 47 h1{font:normal 1.286em/1.5 "";}/*18px*/
 48 h2{font:normal 1.143em/1.5 "";}/*16px*/
 49 h3{font:600 1em/1.5 "";}/*14px*/
 50 .price{margin-left:5px;}
 51 .price i{margin-left:2px; font-size:1.286em;}
 52 .greyfont{color:#686868;}
 53 .greyfont1{color:#909090;}
 54 .bggrey{height:100%; background:#f5f5f5;}
 55 
 56 /*header*/
 57 header{position:fixed; top:0; left:0; z-index:9999; width:100%; height:48px;background-color:#1491c5;}
 58 .returnico{position:absolute; left:0; top:0;  width:68px; height:48px; background-color:#15a4d5;}
 59 .returnico:before{left:25px;top:16px;width:12px;height:20px; background-position:0 0;}
 60 .icon_phone,.icon_home{width:42px;height:100%;top:0;position:relative;float:right;}
 61 .icon_phone:before{width:11px;height:20px;top:16px;right:12px;background-position:-115px -65px;}
 62 .icon_home:before{width:20px;height:19px;top:16px;right:10px;background-position:-83px -66px;}
 63 header i:active{opacity:0.7; filter:alpha(opacity=70);}
 64 header h1{position:absolute; width:100%;line-height:48px; text-align:center; letter-spacing:2px; color: #fff;}
 65 .header_r,.header_rs{position:absolute;z-index:9; top:0; right:0; line-height:48px; padding:0 15px; font-size:18px; background:#15a4d5; color:#fff;}
 66 .header_rs{padding:0 5px; font-size:12px; }
 67 
 68 /*background-position*/
 69 .select_n:before{width:20px;height:20px;background-position:-18px 0;}
 70 .select_n.current:before{background-position:-44px 0;}
 71 
 72 /*searchbox*/
 73 .search_wrap{overflow:hidden; padding:10px; background:#dfeaf1;}
 74 .search_box{position:relative; float:left; width:100%;}
 75 .search_input{width:100%; padding:0 10px 0 28px; line-height:30px; background-color:#fff; border-radius:4px; color:#ccc;}
 76 .fdj:before,.fdj:after,.search_box:before,.search_box:after{position:absolute; content:""; z-index:9;}
 77 .fdj:before,.search_box:before{left:5px; top:7px; width:12px; height:12px; border:1px solid #bcbcbc; border-radius:12px;}
 78 .fdj:after,.search_box:after{left:19px; top:17px; width:1px; height:8px; background:#bcbcbc;}
 79 .search_cancel{ display:none;float:left; width:20%; line-height:30px; text-align:center; font-size:16px;color:#1491c5; background:none; border:none;}
 80 .close_icon{display:none; position:absolute; z-index:10; top:8px; right:4px; width:16px; height:16px; border-radius:30px; background:#b1b1b1;}
 81 .close_icon:before,.close_icon:after{position:absolute; content:""; top:4px; left:7px; width:2px; height:8px; background:#fff; }
 82 .close_icon:before{-webkit-transform:rotate(45deg);-moz-transform:rotate(45deg);-ms-transform:rotate(45deg);-o-transform:rotate(45deg);transform:rotate(45deg);}
 83 .fdj:after,.search_box:after,.close_icon:after{-webkit-transform:rotate(-45deg);-moz-transform:rotate(-45deg);-ms-transform:rotate(-45deg);-o-transform:rotate(-45deg);transform:rotate(-45deg);}
 84 .search_focus .search_box{width:80%;}
 85 .search_focus .close_icon, .search_focus .search_cancel{display:block;}
 86 .search_input:focus{color:#000;}
 87 
 88 /*tab*/
 89 .tab{ background-color:#f8f8f8; border-bottom:1px solid #dfdfdf;}
 90 .tab li{float:left; width:50%; height:39px; line-height:39px; text-align:center; border-right:1px solid #dfdfdf;}
 91 .tab li:last-child{border-right:none;}
 92 .tab li.tabcrt{ background-color:#dfdfdf;}
 93 
 94 .tab_b{ background-color:#f5f5f5; border-bottom:1px solid #c1c1c1;}
 95 .tab_b li{float:left; width:50%; height:39px; line-height:39px; text-align:center;}
 96 .tab_b li:last-child{border-right:none;}
 97 .tab_b li.tabcrt{color:#1491c5; border-bottom:4px solid #1491c5;}
 98 
 99 /*list*/
100 .list_st_border{ background:#fff; border-bottom:none; border:1px solid #cfcfcf; }
101 .list_st_border li{position:relative;padding:0 10px; line-height:42px; border-bottom:1px solid #cfcfcf;}
102 .list_st_border li:last-child{border-bottom:none;}
103 
104 .list_sli{padding:10px; overflow:hidden; border-bottom:1px solid #cfcfcf; background:#fff;}
105 .list_sli .list_sunit{float:left;}
106 
107 .citylist{color:#000;}
108 .citylist dt,.citylist dd{padding-left:10px;border-bottom:1px solid #e2e2e2;}
109 .citylist dt{line-height:25px; background-color:#eaeaea;}
110 .citylist dd{position:relative; font-size:16px; line-height:43px; background-color:#fff;}
111 .citylist .ok_crt{color:#1491c5;}
112 .citylist .ok_crt:after{position:absolute;content:""; right:10px; top:50%; margin-top:-6px; width:12px; height:13px; background-position:-110px 0;}
113 
114 
115 /*arr*/
116 .li_arr_r{position:relative;}
117 .arr_r{position:absolute;right:0px; top:50%; width:30px; height:30px; margin-top:-15px; }
118 .arr_r:before,.arr_r:after,.li_arr_r:before,.li_arr_r:after{position: absolute; left:15px; content: "";width:2px; height:7px;  background-color:#909090;}
119 .arr_r:before,.li_arr_r:before{top:10px;-webkit-transform:rotate(-45deg); -moz-transform:rotate(-45deg);-ms-transform:rotate(-45deg);-o-transform:rotate(-45deg);transform:rotate(-45deg);}
120 .arr_r:after,.li_arr_r:after{top:15px;-webkit-transform:rotate(45deg); -moz-transform:rotate(45deg);-ms-transform:rotate(45deg);-o-transform:rotate(45deg);transform:rotate(45deg);}
121 .li_arr_r:before,.li_arr_r:after{left:auto; right:10px; top:50%; margin-top:-5px;}
122 .li_arr_r:after{margin-top:0;}
123 
124 /*p*/
125 .p_grey{margin:10px 5px; font-size:13px; color:#989898;}
126 .p_grey_center{ text-align:center; margin:20px 5px; font-size:13px; color:#989898;}
127 .p_hinttxt{padding:20px 10px; text-align:center; font-size:16px;  color:#1491c5;}
128 
129 
130 /*btn*/
131 .btn_yellow,.btn_del{width:100%; height:44px; line-height:42px; padding:0 10px;  color:#fff;}
132 .btn_yellow{background:#ff9913;}
133 .btn_del{background:#ca4345;text-align:center;font-size:1.2em;}
134 
135 .btn_pay{padding:0 20px;height:44px;float:right;background:#ff7d13;color:#fff;}
136 .btn_pay:active{background:#ff7300;}
137 .room_num {position:absolute; right:10px; width:100px; height:30px; line-height:30px;color:#000;background-color: #fff; text-align:center;border:#bfbfbf 1px solid;}
138 .room_num i{position:absolute; width:30px; height:30px; text-align:center; font:normal 2em/28px "Arial";}
139 .room_num i:first-child{left:0;background:#f4f4f4;color:#d9d9d9;font:normal 2.8em/25px "Arial";}
140 .room_num i:last-child{right:0;background:#06a2d0;color:#fff;}
141 
142 
143     /*日历*/
144 .cui_cldwrap{color:#000;}
145 .cui_cldweek{height:25px; overflow:hidden;font:normal 12px/24px "verdana";border-bottom:1px solid #c8c8c8;}
146 .cui_cldweek li{float:left; width:14%; text-align:center; }
147 .cui_cldweek li:first-child,.cui_cldweek li:last-child{width:15%; color:#acacac;}
148 .cui_cldmonth{height:35px;text-align:center;font:normal 16px/35px "verdana"; background:#fff;}
149 .cui_cldunit{margin-bottom:20px;}
150 .cui_cld_daybox{overflow:hidden; background:#fff;}
151 .cui_cld_daybox li{float:left; width:14%; height:45px; padding:4px 0; font:normal 12px/45px "verdana"; overflow:hidden; text-align:center;}
152 .cui_cld_daybox li:nth-child(7n),.cui_cld_daybox li:nth-child(7n+1){width:15%;}
153 .cui_cld_daypass{ background:#f7f7f7;}
154 .cui_cld_daycrt{background:#06a2d0; color:#fff;}
155 .cui_cld_dayfuture{background:#fff;}
156 .cui_cld_day_nocrtmonth{ visibility:hidden;}
157 .cui_cld_day_havetxt em{display:block; line-height:25px;}
158 .cui_cld_day_havetxt i{display:block;line-height:15px;}
159 .cui_cld_day_hint{color:#06a2d0;}
160 /*全局XXXX*/
161 
162 /*弹出蓝色框*/
163 .cui-pop-box{background:#fff;}
164 .cui-text-center{text-align:center;}
165 .cui-pop-box .cui-hd{height:40px;line-height:40px;font-size:1.2em;color:#fff;background:#1491c5;padding:0 10px;position:relative;}
166 .cui-pop-box .cui-hd .cui-close{position:absolute;top:10px; right:10px; width:18px; height:18px;line-height:18px;border-radius:50%; background:#fff;color:#1491c5;text-align:center;font-weight:bold;}
167 .cui-error{width:150px;margin:auto;border-radius:5px;background:rgba(73,73,73,1);padding:10px;color:#fff;font-weight:700;text-align:center;word-break:break-all;}
168 .cui-select-view li{border-bottom:#dfdfdf 1px solid;padding:.8em 2em .8em .8em;white-space:nowrap; overflow:hidden; text-overflow:ellipsis;position:relative;}
169 .cui-select-view li.current{color:#1084bc;}
170 .cui-select-view li:active{background:rgba(0,0,0,.05);}
171 .cui-select-view li.current:before,.cui-select-view li.current:after{position:absolute;content:"";background:#1084bc;height:3px;top:50%;border-radius:3px;}
172 .cui-select-view li.current:before{width:18px;right:10px;margin-top:-2px;-webkit-transform:rotate(-50deg);-moz-transform:rotate(-50deg);-ms-transform:rotate(-50deg);transform:rotate(-50deg);}
173 .cui-select-view li.current:after{width:9px;right:22px;margin-top:2px;-webkit-transform:rotate(45deg);-moz-transform:rotate(45deg);-ms-transform:rotate(45deg);transform:rotate(45deg);}
174 
175 .cui-roller{width:100%;height:90px;overflow:hidden;position:relative;display: -webkit-box;display: -moz-box;display: -ms-flexbox;display: -webkit-flex;display: flex;}
176 .cui-roller .ul-list{text-align:center;font-size:1.1em;line-height:30px;-webkit-box-flex: 1;-moz-box-flex: 1;-webkit-flex: 1;-ms-flex: 1;flex: 1; position: absolute; left: 50%; margin-left: -23px; }
177 .cui-mask{position:absolute;z-index:3;top: 0;left: 0;width: 100%;height: 100%;pointer-events: none;
178     background: linear-gradient(#fff 0,rgba(245,245,245,0) 52%,rgba(245,245,245,0) 48%,#fff 100%);
179     background: -webkit-gradient(linear,left bottom,left top,from(#fff),color-stop(0.52,rgba(245,245,245,0)),color-stop(0.48,rgba(245,245,245,0)),to(#fff));
180     background: -webkit-linear-gradient(#fff 0,rgba(245,245,245,0) 52%,rgba(245,245,245,0) 48%,#fff 100%);
181     background: -moz-linear-gradient(#fff 0,rgba(245,245,245,0) 52%,rgba(245,245,245,0) 48%,#fff 100%);
182 }
183 .cui-lines{width:100%;height:34px;position:absolute;top:50%;margin-top:-17px;border-top:#dfdfdf 1px solid;border-bottom:#dfdfdf 1px solid;}
184 .cui-roller-tips{color:#8d8d8d;padding:5px;text-align:center;}
185 .cui-roller-btns{background:#f6f5f5;padding:10px;text-align:center;}
186 .cui-roller-btns span{width:45%;display:inline-block;padding:10px 0;color:#fff;}
187 .cui-roller-btns span:active{opacity:.75;}
188 .cui-roller-btns .cui-btns-cancel{background:#a9a9a9;margin-right:5%;}
189 .cui-roller-btns .cui-btns-sure{background:#ff9913;}
190 
191     </style>
192   <script id="others_zepto_10rc1" type="text/javascript" class="library" src="http://sandbox.runjs.cn/js/sandbox/other/zepto.min.js"></script>
193   <script type="text/javascript" src="http://sandbox.runjs.cn/uploads/rs/279/2h5lvbt5/fastclick.js"></script>
194 </head>
195 <body>
196   <div class="cui-pop-box">
197     <div class="cui-hd">
198       <div class="cui-text-center">
199         滚轮滚轮滚轮</div>
200     </div>
201     <div class="cui-bd">
202       <div class="cui-roller" >
203       <div id="wrapper" style="width: 100px; position: relative;  ">
204          <ul class="ul-list" id="scroller" style="left: 40%; width: 100px;">
205           <li>选项1</li>
206           <li>选项2</li>
207           <li>选项3</li>
208           <li>选项4</li>
209           <li>选项5</li>
210           <li>选项6</li>
211           <li>选项7</li>
212           <li>选项8</li>
213           <li>选项9</li>
214           <li>选项10</li>
215         </ul>
216       </div>
217      
218         <div id="wrapper2" style="width: 100px; position: relative;">
219           <ul class="ul-list" id="scroller2" style="right: 10%; width: 100px;">
220             <li>选项11</li>
221             <li>选项12</li>
222             <li>选项13</li>
223             <li>选项14</li>
224             <li>选项15</li>
225             <li>选项16</li>
226             <li>选项17</li>
227             <li>选项18</li>
228             <li>选项19</li>
229             <li>选项20</li>
230           </ul>
231         </div>
232    
233         <div class="cui-lines">
234           &nbsp;</div>
235     </div>
236       <p class="cui-roller-tips">
237         提示信息</p>
238       <div class="cui-roller-btns">
239         <span class="cui-btns-cancel">取消</span><span class="cui-btns-sure">确定</span>
240       </div>
241     </div>
242   </div>
243   <script type="text/javascript">
244 
245     var utils = (function () {
246       var me = {};
247       var _elementStyle = document.createElement(‘div‘).style;
248 
249       //获得需要兼容CSS3前缀
250       var _vendor = (function () {
251         var vendors = [‘t‘, ‘webkitT‘, ‘MozT‘, ‘msT‘, ‘OT‘];
252         var transform;
253         var i = 0;
254         var l = vendors.length;
255 
256         for (; i < l; i++) {
257           transform = vendors[i] + ‘ransform‘;
258           if (transform in _elementStyle) return vendors[i].substr(0, vendors[i].length - 1);
259         }
260         return false;
261       })();
262 
263       //获取样式（CSS3兼容）
264       function _prefixStyle(style) {
265         if (_vendor === false) return false;
266         if (_vendor === ‘‘) return style;
267         return _vendor + style.charAt(0).toUpperCase() + style.substr(1);
268       }
269 
270       me.getTime = Date.now || function getTime() { return new Date().getTime(); };
271 
272       me.addEvent = function (el, type, fn, capture) {
273         if (el[0]) el = el[0];
274         el.addEventListener(type, fn, !!capture);
275       };
276 
277       me.removeEvent = function (el, type, fn, capture) {
278         if (el[0]) el = el[0];
279         el.removeEventListener(type, fn, !!capture);
280       };
281 
282       /*
283       current：当前鼠标位置
284       start：touchStart时候记录的Y（可能是X）的开始位置，但是在touchmove时候可能被重写
285       time： touchstart到手指离开时候经历的时间，同样可能被touchmove重写
286       lowerMargin：y可移动的最大距离，这个一般为计算得出 this.wrapperHeight - this.scrollerHeight
287       wrapperSize：如果有边界距离的话就是可拖动，不然碰到0的时候便停止
288       */
289       me.momentum = function (current, start, time, lowerMargin, wrapperSize) {
290         var distance = current - start,
291         speed = Math.abs(distance) / time,
292         destination,
293         duration,
294         deceleration = 0.0006;
295 
296         destination = current + (speed * speed) / (2 * deceleration) * (distance < 0 ? -1 : 1);
297         duration = speed / deceleration;
298 
299         if (destination < lowerMargin) {
300           destination = wrapperSize ? lowerMargin - (wrapperSize / 2.5 * (speed / 8)) : lowerMargin;
301           distance = Math.abs(destination - current);
302           duration = distance / speed;
303         } else if (destination > 0) {
304           destination = wrapperSize ? wrapperSize / 2.5 * (speed / 8) : 0;
305           distance = Math.abs(current) + destination;
306           duration = distance / speed;
307         }
308 
309         return {
310           destination: Math.round(destination),
311           duration: duration
312         };
313 
314       };
315 
316       $.extend(me, {
317         hasTouch: ‘ontouchstart‘ in window
318       });
319 
320 
321       //我们暂时只判断touch 和 mouse即可
322       $.extend(me.style = {}, {
323         transform: _prefixStyle(‘transform‘),
324         transitionTimingFunction: _prefixStyle(‘transitionTimingFunction‘),
325         transitionDuration: _prefixStyle(‘transitionDuration‘),
326         transitionDelay: _prefixStyle(‘transitionDelay‘),
327         transformOrigin: _prefixStyle(‘transformOrigin‘)
328       });
329 
330       $.extend(me.eventType = {}, {
331         touchstart: 1,
332         touchmove: 1,
333         touchend: 1,
334 
335         mousedown: 2,
336         mousemove: 2,
337         mouseup: 2
338       });
339 
340       $.extend(me.ease = {}, {
341         quadratic: {
342           style: ‘cubic-bezier(0.25, 0.46, 0.45, 0.94)‘,
343           fn: function (k) {
344             return k * (2 - k);
345           }
346         },
347         circular: {
348           style: ‘cubic-bezier(0.1, 0.57, 0.1, 1)‘, // Not properly "circular" but this looks better, it should be (0.075, 0.82, 0.165, 1)
349           fn: function (k) {
350             return Math.sqrt(1 - (--k * k));
351           }
352         },
353         back: {
354           style: ‘cubic-bezier(0.175, 0.885, 0.32, 1.275)‘,
355           fn: function (k) {
356             var b = 4;
357             return (k = k - 1) * k * ((b + 1) * k + b) + 1;
358           }
359         },
360         bounce: {
361           style: ‘‘,
362           fn: function (k) {
363             if ((k /= 1) < (1 / 2.75)) {
364               return 7.5625 * k * k;
365             } else if (k < (2 / 2.75)) {
366               return 7.5625 * (k -= (1.5 / 2.75)) * k + 0.75;
367             } else if (k < (2.5 / 2.75)) {
368               return 7.5625 * (k -= (2.25 / 2.75)) * k + 0.9375;
369             } else {
370               return 7.5625 * (k -= (2.625 / 2.75)) * k + 0.984375;
371             }
372           }
373         },
374         elastic: {
375           style: ‘‘,
376           fn: function (k) {
377             var f = 0.22,
378         e = 0.4;
379 
380             if (k === 0) { return 0; }
381             if (k == 1) { return 1; }
382 
383             return (e * Math.pow(2, -10 * k) * Math.sin((k - f / 4) * (2 * Math.PI) / f) + 1);
384           }
385         }
386       });
387       return me;
388     })();
389 
390     function IScroll(opts) {
391       this.wrapper = typeof opts.wrapper == ‘string‘ ? $(opts.wrapper) : opts.wrapper;
392       this.scroller = typeof opts.scroller == ‘string‘ ? $(opts.scroller) : opts.scroller;
393       if (!opts.wrapper[0] || !opts.scroller[0]) throw ‘param error‘;
394 
395       this.wrapper = this.wrapper[0];
396       this.scroller = this.scroller[0];
397 
398       //这个属性会被动态改变的，如果这里
399       this.scrollerStyle = this.scroller.style;
400 
401       this.options = {
402         //每次要求移动的步长
403         setp: false,
404         //是否具有滚动条
405         scrollbars: true,
406         // 其实时期Y的位置
407         startY: 0,
408         //超出边界还原时间点
409         bounceTime: 600,
410         //超出边界返回的动画
411         bounceEasing: utils.ease.circular,
412 
413         //超出边界时候是否还能拖动
414         bounce: true,
415 
416         bindToWrapper: true,
417 
418         //当window触发resize事件60ms后还原
419         resizePolling: 60,
420         startX: 0,
421         startY: 0
422       };
423 
424       for (var i in opts) {
425         this.options[i] = opts[i];
426       }
427 
428       this.translateZ = ‘ translateZ(0)‘;
429 
430       this.x = 0;
431       this.y = 0;
432       this._events = {};
433       this._init();
434 
435       //更新滚动条位置
436       this.refresh();
437 
438       //更新本身位置
439       this.scrollTo(this.options.startX, this.options.startY);
440 
441       this.enable();
442 
443     };
444 
445     IScroll.prototype = {
446       _init: function () {
447         this._initEvents();
448 
449         //初始化滚动条，滚动条此处需要做重要处理
450         if (this.options.scrollbars) {
451           this._initIndicator();
452         }
453       },
454       refresh: function () {
455         var rf = this.wrapper.offsetHeight;     // Force reflow
456 
457         this.wrapperHeight = this.wrapper.clientHeight;
458         this.scrollerHeight = this.scroller.offsetHeight;
459         this.maxScrollY = this.wrapperHeight - this.scrollerHeight;
460 
461         this.endTime = 0;
462 
463         this._execEvent(‘refresh‘);
464 
465         this.resetPosition();
466 
467       },
468       _initEvents: function (remove) {
469         var eventType = remove ? utils.removeEvent : utils.addEvent;
470         var target = this.options.bindToWrapper ? this.wrapper : window;
471 
472         eventType(window, ‘orientationchange‘, this);
473         eventType(window, ‘resize‘, this);
474 
475         if (utils.hasTouch) {
476           eventType(this.wrapper, ‘touchstart‘, this);
477           eventType(target, ‘touchmove‘, this);
478           eventType(target, ‘touchcancel‘, this);
479           eventType(target, ‘touchend‘, this);
480         } else {
481           eventType(this.wrapper, ‘mousedown‘, this);
482           eventType(target, ‘mousemove‘, this);
483           eventType(target, ‘mousecancel‘, this);
484           eventType(target, ‘mouseup‘, this);
485         }
486 
487         eventType(this.scroller, ‘transitionend‘, this);
488         eventType(this.scroller, ‘webkitTransitionEnd‘, this);
489         eventType(this.scroller, ‘oTransitionEnd‘, this);
490         eventType(this.scroller, ‘MSTransitionEnd‘, this);
491       },
492       _start: function (e) {
493         if (!this.enabled || (this.initiated && utils.eventType[e.type] !== this.initiated)) {
494           return;
495         }
496 
497         var point = e.touches ? e.touches[0] : e, pos;
498         this.initiated = utils.eventType[e.type];
499 
500         this.moved = false;
501 
502         this.distY = 0;
503 
504         //开启动画时间，如果之前有动画的话，便要停止动画，这里因为没有传时间，所以动画便直接停止了
505         this._transitionTime();
506 
507         this.startTime = utils.getTime();
508 
509         //如果正在进行动画，需要停止，并且触发滑动结束事件
510         if (this.isInTransition) {
511           this.isInTransition = false;
512           pos = this.getComputedPosition();
513           var _x = Math.round(pos.x);
514           var _y = Math.round(pos.y);
515 
516           if (_y < 0 && _y > this.maxScrollY && this.options.adjustXY) {
517             _y = this.options.adjustXY.call(this, _x, _y).y;
518           }
519 
520           //移动过去
521           this._translate(_x, _y);
522           this._execEvent(‘scrollEnd‘);
523         }
524 
525         this.startX = this.x;
526         this.startY = this.y;
527         this.absStartX = this.x;
528         this.absStartY = this.y;
529         this.pointX = point.pageX;
530         this.pointY = point.pageY;
531 
532         this._execEvent(‘beforeScrollStart‘);
533 
534         e.preventDefault();
535 
536       },
537 
538       _move: function (e) {
539         if (!this.enabled || utils.eventType[e.type] !== this.initiated) {
540           return;
541         }
542         e.preventDefault();
543 
544         var point = e.touches ? e.touches[0] : e,
545       deltaX = point.pageX - this.pointX,
546       deltaY = point.pageY - this.pointY,
547       timestamp = utils.getTime(),
548       newX, newY,
549       absDistX, absDistY;
550 
551         this.pointX = point.pageX;
552         this.pointY = point.pageY;
553 
554         this.distX += deltaX;
555         this.distY += deltaY;
556         absDistX = Math.abs(this.distX);
557         absDistY = Math.abs(this.distY);
558 
559         // 如果一直按着没反应的话这里就直接返回了
560         if (timestamp - this.endTime > 300 && (absDistX < 10 && absDistY < 10)) {
561           return;
562         }
563 
564         newY = this.y + deltaY;
565 
566         if (newY > 0 || newY < this.maxScrollY) {
567           newY = this.options.bounce ? this.y + deltaY / 3 : newY > 0 ? 0 : this.maxScrollY;
568         }
569 
570         if (!this.moved) {
571           this._execEvent(‘scrollStart‘);
572         }
573 
574         this.moved = true;
575 
576         //暂时只考虑input问题，有效再扩展
577         var el = document.activeElement;
578         if (el.nodeName.toLowerCase() == ‘input‘) {
579           el.blur();
580           this.disable();
581           setTimeout($.proxy(function () {
582             this.enable();
583           }, this), 250);
584           return;
585         }
586 
587         this._translate(0, newY, true);
588 
589         if (timestamp - this.startTime > 300) {
590           this.startTime = timestamp;
591           this.startX = this.x;
592           this.startY = this.y;
593         }
594 
595 
596       },
597       _end: function (e) {
598 
599         if (!this.enabled || utils.eventType[e.type] !== this.initiated) {
600           return;
601         }
602 
603         var point = e.changedTouches ? e.changedTouches[0] : e,
604       momentumY,
605       duration = utils.getTime() - this.startTime,
606       newX = Math.round(this.x),
607       newY = Math.round(this.y),
608       distanceX = Math.abs(newX - this.startX),
609       distanceY = Math.abs(newY - this.startY),
610       time = 0,
611       easing = ‘‘;
612 
613         this.isInTransition = 0;
614         this.initiated = 0;
615         this.endTime = utils.getTime();
616 
617         if (this.resetPosition(this.options.bounceTime)) {
618           return;
619         }
620 
621         this.scrollTo(newX, newY);
622         if (!this.moved) {
623           //click 的情况
624 
625           this._execEvent(‘scrollCancel‘);
626           return;
627         }
628 
629         if (duration < 300) {
630 
631           momentumY = utils.momentum(this.y, this.startY, duration, this.maxScrollY, this.options.bounce ? this.wrapperHeight : 0);
632           //      newX = momentumX.destination;
633           newY = momentumY.destination;
634           time = Math.max(momentumY.duration);
635           this.isInTransition = 1;
636         }
637 
638         if (newY != this.y) {
639           if (newY > 0 || newY < this.maxScrollY) {
640             easing = utils.ease.quadratic;
641           }
642 
643           this.scrollTo(newX, newY, time, easing);
644           return;
645         }
646 
647         this._execEvent(‘scrollEnd‘);
648       },
649 
650       _resize: function () {
651         var that = this;
652 
653         clearTimeout(this.resizeTimeout);
654 
655         this.resizeTimeout = setTimeout(function () {
656           that.refresh();
657         }, this.options.resizePolling);
658       },
659 
660       _transitionTimingFunction: function (easing) {
661         this.scrollerStyle[utils.style.transitionTimingFunction] = easing;
662 
663         this.indicator && this.indicator.transitionTimingFunction(easing);
664       },
665 
666       //开始或者停止动画
667       _transitionTime: function (time) {
668         time = time || 0;
669         this.scrollerStyle[utils.style.transitionDuration] = time + ‘ms‘;
670 
671         //滚动条，我们这里只会出现一个滚动条就不搞那么复杂了
672         this.indicator && this.indicator.transitionTime(time);
673 
674       },
675 
676       getComputedPosition: function () {
677         var matrix = window.getComputedStyle(this.scroller, null), x, y;
678 
679         matrix = matrix[utils.style.transform].split(‘)‘)[0].split(‘, ‘);
680         x = +(matrix[12] || matrix[4]);
681         y = +(matrix[13] || matrix[5]);
682 
683         return { x: x, y: y };
684       },
685 
686       _initIndicator: function () {
687         //滚动条
688         var el = createDefaultScrollbar();
689         this.wrapper.appendChild(el);
690         this.indicator = new Indicator(this, { el: el });
691 
692         this.on(‘scrollEnd‘, function () {
693           this.indicator.fade();
694         });
695 
696         var scope = this;
697         this.on(‘scrollCancel‘, function () {
698           scope.indicator.fade();
699         });
700 
701         this.on(‘scrollStart‘, function () {
702           scope.indicator.fade(1);
703         });
704 
705         this.on(‘beforeScrollStart‘, function () {
706           scope.indicator.fade(1, true);
707         });
708 
709         this.on(‘refresh‘, function () {
710           scope.indicator.refresh();
711         });
712 
713       },
714 
715       //移动x，y这里比较简单就不分离y了
716       _translate: function (x, y, isStep) {
717 
718         //处理步长
719         if (this.options.setp && !isStep) {
720           var flag2 = y > 0 ? 1 : -1; //这个会影响后面的计算结果
721           var top = Math.abs(y);
722           var mod = top % this.options.setp;
723           top = (parseInt(top / this.options.setp) * this.options.setp + (mod > (this.options.setp / 2) ? this.options.setp : 0)) * flag2;
724           y = top;
725         }
726 
727         this.scrollerStyle[utils.style.transform] = ‘translate(‘ + x + ‘px,‘ + y + ‘px)‘ + this.translateZ;
728 
729         this.x = x;
730         this.y = y;
731 
732         if (this.options.scrollbars) {
733           this.indicator.updatePosition();
734         }
735 
736       },
737 
738       resetPosition: function (time) {
739         var x = this.x,
740         y = this.y;
741 
742         time = time || 0;
743 
744         if (this.y > 0) {
745           y = 0;
746         } else if (this.y < this.maxScrollY) {
747           y = this.maxScrollY;
748         }
749 
750         if (y == this.y) {
751           return false;
752         }
753 
754         this.scrollTo(x, y, time, this.options.bounceEasing);
755 
756         return true;
757       },
758 
759       //移动
760       scrollTo: function (x, y, time, easing) {
761 
762         //      //l_wang 必须项目高度的整数
763         //      if (y < 0 && y > this.maxScrollY && this.options.adjustXY) {
764         //        y = this.options.adjustXY.call(this, x, y).y;
765         //      }
766 
767 
768         if (this.options.adjustXY) {
769           y = this.options.adjustXY.call(this, x, y).y;
770         }
771 
772         //l_wang 验证该项是否可选
773         if (this.options.checkSelected) {
774           y = this.options.checkSelected.call(this, x, y).y;
775         }
776 
777         easing = easing || utils.ease.circular;
778 
779         this.isInTransition = time > 0;
780 
781         if (!time || easing.style) {
782           this._transitionTimingFunction(easing.style);
783           this._transitionTime(time);
784           this._translate(x, y);
785         }
786       },
787 
788       //统一的关闭接口
789       disable: function () {
790         this.enabled = false;
791       },
792       //统一的open接口
793       enable: function () {
794         this.enabled = true;
795       },
796 
797       on: function (type, fn) {
798         if (!this._events[type]) {
799           this._events[type] = [];
800         }
801 
802         this._events[type].push(fn);
803       },
804 
805       _execEvent: function (type) {
806         if (!this._events[type]) {
807           return;
808         }
809 
810         var i = 0,
811             l = this._events[type].length;
812 
813         if (!l) {
814           return;
815         }
816 
817         for (; i < l; i++) {
818           this._events[type][i].call(this);
819         }
820       },
821       destroy: function () {
822         this._initEvents(true);
823         this._execEvent(‘destroy‘);
824         this.indicator && this.indicator.destroy();
825 
826         console.log(‘destroy‘)
827 
828       },
829 
830       _transitionEnd: function (e) {
831         if (e.target != this.scroller || !this.isInTransition) {
832           return;
833         }
834 
835         this._transitionTime();
836         if (!this.resetPosition(this.options.bounceTime)) {
837           this.isInTransition = false;
838           this._execEvent(‘scrollEnd‘);
839         }
840       },
841 
842       //事件具体触发点
843       handleEvent: function (e) {
844         switch (e.type) {
845           case ‘touchstart‘:
846           case ‘mousedown‘:
847             this._start(e);
848             break;
849           case ‘touchmove‘:
850           case ‘mousemove‘:
851             this._move(e);
852             break;
853           case ‘touchend‘:
854           case ‘mouseup‘:
855           case ‘touchcancel‘:
856           case ‘mousecancel‘:
857             this._end(e);
858             break;
859           case ‘orientationchange‘:
860           case ‘resize‘:
861             this._resize();
862             break;
863           case ‘transitionend‘:
864           case ‘webkitTransitionEnd‘:
865           case ‘oTransitionEnd‘:
866           case ‘MSTransitionEnd‘:
867             this._transitionEnd(e);
868             break;
869         }
870       }
871 
872     };
873 
874     function createDefaultScrollbar() {
875       var scrollbar = document.createElement(‘div‘),
876         indicator = document.createElement(‘div‘);
877 
878       scrollbar.style.cssText = ‘position:absolute;z-index:9999‘;
879       scrollbar.style.cssText += ‘;width:7px;bottom:2px;top:2px;right:1px‘;
880       scrollbar.style.cssText += ‘;overflow:hidden‘;
881 
882       indicator.style.cssText = ‘-webkit-box-sizing:border-box;-moz-box-sizing:border-box;box-sizing:border-box;position:absolute;background:rgba(0,0,0,0.5);border:1px solid rgba(255,255,255,0.9);border-radius:3px‘;
883       indicator.style.width = ‘100%‘;
884 
885       scrollbar.appendChild(indicator);
886 
887       return scrollbar;
888     }
889 
890     function Indicator(scroller, opts) {
891       this.wrapper = typeof opts.el == ‘string‘ ? document.querySelector(opts.el) : opts.el;
892       this.indicator = this.wrapper.children[0];
893 
894       this.wrapperStyle = this.wrapper.style;
895       this.indicatorStyle = this.indicator.style;
896       this.scroller = scroller;
897 
898       this.sizeRatioY = 1;
899       this.maxPosY = 0;
900 
901       this.wrapperStyle[utils.style.transform] = this.scroller.translateZ;
902       this.wrapperStyle[utils.style.transitionDuration] = ‘0ms‘;
903       //this.wrapperStyle.opacity = ‘0‘;
904     }
905 
906     Indicator.prototype = {
907       transitionTime: function (time) {
908         time = time || 0;
909         this.indicatorStyle[utils.style.transitionDuration] = time + ‘ms‘;
910       },
911       transitionTimingFunction: function (easing) {
912         this.indicatorStyle[utils.style.transitionTimingFunction] = easing;
913       },
914       refresh: function () {
915 
916         this.transitionTime();
917 
918         var r = this.wrapper.offsetHeight; // force refresh
919 
920         this.wrapperHeight = this.wrapper.clientHeight;
921 
922 
923         this.indicatorHeight = Math.max(Math.round(this.wrapperHeight * this.wrapperHeight / (this.scroller.scrollerHeight || this.wrapperHeight || 1)), 8);
924         this.indicatorStyle.height = this.indicatorHeight + ‘px‘;
925 
926 
927         this.maxPosY = this.wrapperHeight - this.indicatorHeight;
928         this.sizeRatioY = (this.scroller.maxScrollY && (this.maxPosY / this.scroller.maxScrollY));
929 
930         this.updatePosition();
931       },
932       destroy: function () {
933         this.wrapper.remove();
934       },
935       updatePosition: function () {
936         var y = Math.round(this.sizeRatioY * this.scroller.y) || 0;
937         this.y = y;
938 
939         //不需要兼容方式了
940         this.indicatorStyle[utils.style.transform] = ‘translate(0px,‘ + y + ‘px)‘ + this.scroller.translateZ;
941 
942       },
943       fade: function (val, hold) {
944         if (hold && !this.visible) {
945           return;
946         }
947 
948         clearTimeout(this.fadeTimeout);
949         this.fadeTimeout = null;
950 
951         var time = val ? 250 : 500,
952             delay = val ? 0 : 300;
953 
954         val = val ? ‘1‘ : ‘0‘;
955 
956         this.wrapperStyle[utils.style.transitionDuration] = time + ‘ms‘;
957 
958         this.fadeTimeout = setTimeout($.proxy(function (val) {
959           this.wrapperStyle.opacity = val;
960           this.visible = +val;
961         }, this), delay);
962 
963       }
964     };
965 
966     IScroll.utils = utils;
967 
968   </script>
969   <script type="text/javascript">
970 
971     var s = new IScroll({
972       wrapper: $(‘#wrapper‘),
973       scroller: $(‘#scroller‘),
974       scrollbars: false,
975       setp: 30
976     });
977 
978     var s1 = new IScroll({
979       wrapper: $(‘#wrapper2‘),
980       scroller: $(‘#scroller2‘),
981       scrollbars: false,
982       setp: 30
983     });
984 
985     new FastClick(document.body);
986 
987   </script>
988 </body>
989 </html>