一、效果如下
点击“测试中奖纪录”弹出弹框。弹框中内容超出时显示滚动条。
二、代码部分
1、html结构
<body>
<a href="javascript:;" id="bbb">测试中奖纪录</a>
<!--弹框6中奖纪录-->
<div class="tcbox" id="reward_info" style="display:none">
<div class="tcmain6">
<div class="tcclose"></div>
<div class="tc-content6">
<div class="top-wrap">
<h2>中奖纪录</h2>
</div>
<dl class="num-list" id="test-list">
<dt><span class="list-num">第20151225004期</span><span class="list-right">2015-12-25 11:01:12</span></dt>
<dd>
<div class="record-img-left"> <img src="data:images/s1.jpg"> </div>
<div class="record-right">
<h4>中奖幸运号:<span>10001234</span></h4>
<p>奖品筹备中, 等待发货</p>
<p>中通, 1273637484637333</p>
</div>
</dd>
<dt><span class="list-num">第20151225003期</span><span class="list-right">2015-12-25 11:01:12</span></dt>
<dd>
<div class="record-img-left"> <img src="data:images/s1.jpg"> </div>
<div class="record-right">
<h4>中奖幸运号:<span>10001234</span></h4>
<p>奖品筹备中, 等待发货</p>
<p>中通, 1273637484637333</p>
</div>
</dd>
<dt><span class="list-num">第20151225002期</span><span class="list-right">2015-12-25 11:01:12</span></dt>
<dd>
<div class="record-img-left"> <img src="data:images/s1.jpg"> </div>
<div class="record-right">
<h4>中奖幸运号:<span>10001234</span></h4>
<p>奖品筹备中, 等待发货</p>
<p>中通, 1273637484637333</p>
</div>
</dd>
<dt><span class="list-num">第20151225001期</span><span class="list-right">2015-12-25 11:01:12</span></dt>
<dd>
<div class="record-img-left"> <img src="data:images/s1.jpg"> </div>
<div class="record-right">
<h4>中奖幸运号:<span>10001234</span></h4>
<p>奖品筹备中, 等待发货</p>
<p>中通, 1273637484637333</p>
</div>
</dd>
</dl>
</div>
<p class="p-bottom">＊您还没有填写过<a href="javascript:;">领奖地址</a>，不要和奖品擦肩而过啊</p>
</div>
</div>
</body>
2、css如下
/*弹框1*/
.tcbox { width: 100%; height: 100%; position: fixed; top: 0px; left: 0px; background: transparent url("http://static9.pplive.cn/oth/2015/yiyuan/v_20150820174118/images/blackbg.png") repeat scroll 0% 0%; z-index:; }
.tcclose { width: 50px; height: 50px; cursor: pointer; position: absolute; top: 0px; right: -50px; background: url(../images/close-button.png) no-repeat center; overflow: hidden; }
/*弹层6*/
.tcmain6 { width: 500px; height: 610px; position: absolute; top: 50%; left: 50%; margin: -305px 0px 0px -250px; background: #fff; }
.tc-content6 .top-wrap { height: 54px; font-size: 16px; background-color: #f6f6f6; color: #4d4d4d; padding-top: 22px; }
.tc-content6 .top-wrap h2 { font-size: 20px; color: #333; text-align: center; padding-bottom: 5px; }
.tc-content6 .list-num { font-size: 16px; line-height: 22px; color: #1a1a1a; font-weight:; }
.tc-content6 .list-right { padding-left: 12px; font-size: 13px; color: #b2b2b2; }
.tc-content6 .p-title span { color: #ff6200; }
.tc-content6 .num-list { margin: 22px 24px 28px 40px; height: 453px; overflow: hidden; }
.tc-content6 .num-list dt { font-size: 14px; color: #1a1a1a; padding-bottom: 10px; }
.tc-content6 .num-list dd { font-size: 14px; color: #666; padding-left: 10px; padding-bottom: 30px; }
.p-bottom a { color: #ff6200; text-decoration: underline; }
.tc-content6 .record-img-left { width: 90px; height: 90px; border: 1px solid #b2b2b2; float: left; }
.tc-content6 .record-img-left img { display: block; width: 90px; }
.tc-content6 .record-right { margin-left: 105px; }
.tc-content6 .record-right h4 { font-size: 16px; color: #1a1a1a; font-weight: normal; padding-bottom: 8px; border-bottom: 1px dotted #e3e3e3; margin-bottom: 10px; }
.tc-content6 .record-right h4 span { color: #ff6200; margin-left: 8px; }
.tc-content6 .record-right p { font-size: 13px; color: #808080; line-height: 24px; }
3、重点部分，js
<script type="text/javascript">
$.fn.extend({//添加滚轮事件//by jun
mousewheel:function(Func){
return this.each(function(){
var _self = this;
_self.D = 0;//滚动方向
if($.browser.msie||$.browser.safari){
_self.onmousewheel=function(){_self.D = event.wheelDelta;event.returnValue = false;Func && Func.call(_self);};
}else{
_self.addEventListener("DOMMouseScroll",function(e){
_self.D = e.detail>0?-1:1;
e.preventDefault();
Func && Func.call(_self);
},false);
}
});
}
});
$.fn.extend({
jscroll:function(j){
return this.each(function(){
j = j || {}
j.Bar = j.Bar||{};//2级对象
j.Btn = j.Btn||{};//2级对象
j.Bar.Bg = j.Bar.Bg||{};//3级对象
j.Bar.Bd = j.Bar.Bd||{};//3级对象
j.Btn.uBg = j.Btn.uBg||{};//3级对象
j.Btn.dBg = j.Btn.dBg||{};//3级对象
var jun = { W:"12px"
,BgUrl:""
,Bg:"#fff586"
,Bar:{ Pos:"up"
,Bd:{Out:"#f9f0d5",Hover:"#f9f0d5"}
,Bg:{Out:"#fe970e",Hover:"#fe970e",Focus:"orange"}}
,Btn:{ btn:true
,uBg:{Out:"#fe970e",Hover:"#fe970e",Focus:"orange"}
,dBg:{Out:"#fe970e",Hover:"#fe970e",Focus:"orange"}}
,Fn:function(){}}
j.W = j.W||jun.W;
j.BgUrl = j.BgUrl||jun.BgUrl;
j.Bg = j.Bg||jun.Bg;
j.Bar.Pos = j.Bar.Pos||jun.Bar.Pos;
j.Bar.Bd.Out = j.Bar.Bd.Out||jun.Bar.Bd.Out;
j.Bar.Bd.Hover = j.Bar.Bd.Hover||jun.Bar.Bd.Hover;
j.Bar.Bg.Out = j.Bar.Bg.Out||jun.Bar.Bg.Out;
j.Bar.Bg.Hover = j.Bar.Bg.Hover||jun.Bar.Bg.Hover;
j.Bar.Bg.Focus = j.Bar.Bg.Focus||jun.Bar.Bg.Focus;
j.Btn.btn = j.Btn.btn!=undefined?j.Btn.btn:jun.Btn.btn;
j.Btn.uBg.Out = j.Btn.uBg.Out||jun.Btn.uBg.Out;
j.Btn.uBg.Hover = j.Btn.uBg.Hover||jun.Btn.uBg.Hover;
j.Btn.uBg.Focus = j.Btn.uBg.Focus||jun.Btn.uBg.Focus;
j.Btn.dBg.Out = j.Btn.dBg.Out||jun.Btn.dBg.Out;
j.Btn.dBg.Hover = j.Btn.dBg.Hover||jun.Btn.dBg.Hover;
j.Btn.dBg.Focus = j.Btn.dBg.Focus||jun.Btn.dBg.Focus;
j.Fn = j.Fn||jun.Fn;
var _self = this;
var Stime,Sp=0,Isup=0;
$(_self).css({overflow:"hidden",position:"relative",padding:"0px"});
var dw = $(_self).width(), dh = $(_self).height()-1;
var sw = j.W ? parseInt(j.W) : 21;
var sl = dw - sw
var bw = j.Btn.btn==true ? sw : 0;
if($(_self).children(".jscroll-c").height()==null){//存在性检测
$(_self).wrapInner("<div class='jscroll-c' style='top:0px;z-index:88;zoom:1;position:relative'></div>");
$(_self).children(".jscroll-c").prepend("<div style='height:0px;overflow:hidden'></div>");
$(_self).append("<div class='jscroll-e' unselectable='on' style=' height:100%;border-radius:4px;top:0;right:0;-moz-user-select:none;position:absolute;overflow:hidden;z-index:89;'><div class='jscroll-u' style='position:absolute;top:0px;width:100%;left:0;background:blue;overflow:hidden'></div><div class='jscroll-h' unselectable='on' style='background:green;position:absolute;left:0;cursor:pointer;border-radius:10px;-moz-user-select:none;border:2px solid'></div><div class='jscroll-d' style='position:absolute;bottom:0px;width:100%;left:0;background:blue;overflow:hidden'></div></div>");
}
var jscrollc = $(_self).children(".jscroll-c");
var jscrolle = $(_self).children(".jscroll-e");
var jscrollh = jscrolle.children(".jscroll-h");
var jscrollu = jscrolle.children(".jscroll-u");
var jscrolld = jscrolle.children(".jscroll-d");
if($.browser.msie){document.execCommand("BackgroundImageCache", false, true);}
jscrollc.css({"padding-right":sw});
jscrolle.css({width:sw,background:j.Bg,"background-image":j.BgUrl});
jscrollh.css({top:bw,background:j.Bar.Bg.Out,"background-image":j.BgUrl,"border-color":j.Bar.Bd.Out,width:sw-4});
jscrollu.css({height:bw,background:j.Btn.uBg.Out,"background-image":j.BgUrl});
jscrolld.css({height:bw,background:j.Btn.dBg.Out,"background-image":j.BgUrl});
jscrollh.hover(function(){if(Isup==0)$(this).css({background:j.Bar.Bg.Hover,"background-image":j.BgUrl,"border-color":j.Bar.Bd.Hover})},function(){if(Isup==0)$(this).css({background:j.Bar.Bg.Out,"background-image":j.BgUrl,"border-color":j.Bar.Bd.Out})})
jscrollu.hover(function(){if(Isup==0)$(this).css({background:j.Btn.uBg.Hover,"background-image":j.BgUrl})},function(){if(Isup==0)$(this).css({background:j.Btn.uBg.Out,"background-image":j.BgUrl})})
jscrolld.hover(function(){if(Isup==0)$(this).css({background:j.Btn.dBg.Hover,"background-image":j.BgUrl})},function(){if(Isup==0)$(this).css({background:j.Btn.dBg.Out,"background-image":j.BgUrl})})
//alert(jscrollc.height());
//alert(jscrollc.width()); var sch = jscrollc.height();
//var sh = Math.pow(dh,2) / sch ;//Math.pow(x,y)x的y次方
//alert("dh :"+dh); //lxy
//alert("bw :"+bw); //lxy
//alert("sch :"+sch); var sh = (dh-2*bw)*dh / sch;
//alert(sh);//lxy
if(sh<10){sh=10}
var wh = sh/6
// sh = parseInt(sh);
var curT = 0,allowS=false;
//alert(sh);//lxy
jscrollh.height(sh);
//console.log(sch+":"+dh);
if(sch<=dh){jscrollc.css({padding:0});jscrolle.css({display:"none"})}else{jscrolle.css({display:"block"});allowS=true;}
if(j.Bar.Pos!="up"){
curT=dh-sh-bw;
setT();
}
jscrollh.bind("mousedown",function(e){
j['Fn'] && j['Fn'].call(_self);
Isup=1;
jscrollh.css({background:j.Bar.Bg.Focus,"background-image":j.BgUrl})
var pageY = e.pageY ,t = parseInt($(this).css("top"));
$(document).mousemove(function(e2){
curT =t+ e2.pageY - pageY;//pageY浏览器可视区域鼠标位置，screenY屏幕可视区域鼠标位置
setT();
});
$(document).mouseup(function(){
Isup=0;
jscrollh.css({background:j.Bar.Bg.Out,"background-image":j.BgUrl,"border-color":j.Bar.Bd.Out})
$(document).unbind();
});
return false;
});
jscrollu.bind("mousedown",function(e){
j['Fn'] && j['Fn'].call(_self);
Isup=1;
jscrollu.css({background:j.Btn.uBg.Focus,"background-image":j.BgUrl})
_self.timeSetT("u");
$(document).mouseup(function(){
Isup=0;
jscrollu.css({background:j.Btn.uBg.Out,"background-image":j.BgUrl})
$(document).unbind();
clearTimeout(Stime);
Sp=0;
});
return false;
});
jscrolld.bind("mousedown",function(e){
j['Fn'] && j['Fn'].call(_self);
Isup=1;
jscrolld.css({background:j.Btn.dBg.Focus,"background-image":j.BgUrl})
_self.timeSetT("d");
$(document).mouseup(function(){
Isup=0;
jscrolld.css({background:j.Btn.dBg.Out,"background-image":j.BgUrl})
$(document).unbind();
clearTimeout(Stime);
Sp=0;
});
return false;
});
_self.timeSetT = function(d){
var self=this;
if(d=="u"){curT-=wh;}else{curT+=wh;}
setT();
Sp+=2;
var t =500 - Sp*50;
if(t<=0){t=0};
Stime = setTimeout(function(){self.timeSetT(d);},t);
}
jscrolle.bind("mousedown",function(e){
j['Fn'] && j['Fn'].call(_self);
curT = curT + e.pageY - jscrollh.offset().top - sh/2;
asetT();
return false;
});
function asetT(){
if(curT<bw){curT=bw;}
if(curT>dh-sh-bw){curT=dh-sh-bw;}
jscrollh.stop().animate({top:curT-2},100);
var scT = -((curT-bw)*sch/(dh-2*bw));
jscrollc.stop().animate({top:scT},1000);
};
function setT(){
if(curT<bw){curT=bw;}
if(curT>dh-sh-bw){curT=dh-sh-bw;}
jscrollh.css({top:curT-2});
var scT = -((curT-bw)*sch/(dh-2*bw));
jscrollc.css({top:scT});
};
$(_self).mousewheel(function(){
if(allowS!=true) return;
j['Fn'] && j['Fn'].call(_self);
if(this.D>0){curT-=wh;}else{curT+=wh;};
setT();
})
});
}
}); $("#bbb").click(function(){
$("#reward_info").show();
$(".num-list").jscroll({
W:"8px" //滚动条宽度
,BgUrl:"" //背景条图片路径
,Bg:"#d6d6d6" //背景条颜色
,Bar:{ Pos:"up" //滚动条默认在顶部，换成down则默认在底部
,Bd:{Out:"#ff6200",Hover:"#d75606"} //移动条的边框颜色/鼠标一上去的颜色
,Bg:{Out:"#ff6200",Hover:"#d75606",Focus:"a44103"}} //移动条的填充颜色，移动上去的颜色，点击的颜色
,Btn:{ btn:false //换成false则上下按钮不显示
,uBg:{Out:"#633",Hover:"#966",Focus:"c99"} //上面按钮的填充颜色，移动上去的颜色，点击的颜色
,dBg:{Out:"#633",Hover:"#966",Focus:"c99"}} //下面按钮的填充颜色，移动上去的颜色，点击的颜色
,Fn:function(){}
}); }); </script>
三、注意事项
1、对jquery库有要求
我平时测试习惯调用在线jquery，地址如下，容易记。
<script src="http://code.jquery.com/jquery-latest.js"></script>
版本为：v1.11.1，在jscroll.js库不支持该版本的jquery。应当使用高版本的。jQuery 1.2.3测试没问题。
2、弹层中显示注意
一定是先调用$("#reward_info").show();把弹层显示出来，再调用$(".num-list").jscroll()方法显示滚动条。
因为原理是要获得内容的高度。在调用show前，没有渲染，得不到高度，显示不出滚动条。
3、高度变化时及时刷新
当内容高度变化时，需及时调用$(".num-list").jscroll()刷新才能正确显示。
本文作者starof,因知识本身在变化，作者也在不断学习成长，文章内容也不定时更新，为避免误导读者，方便追根溯源，请诸位转载注明出处：http://www.cnblogs.com/starof/p/5128341.html有问题欢迎与我讨论，共同进步。