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本文实例讲述了jQuery实现的自定义滚动条。分享给大家供大家参考,具体如下:

可以自由的给滚动条定义背景,上下按钮,当然不仅仅是颜色,连图片当背景也可以。支持鼠标滚轮,点击滚动条滚轴定位,上下按钮久按加速,兼容 ie,firefox,chrome。

调用方法:

$("#a").jscroll();

demo:

<!DOCTYPE HTML>
<html lang="en-US">
<head>
  <meta charset="UTF-8"/>
  <title>demo</title>
  <link rel="stylesheet" type="text/css" href="/css/base.min.css" media="all"/>
  <style type="text/css">
  #a{width:500px;overflow:hidden;position:relative;height:200px;background:#f5f5f5;}
  </style>
</head>
<body>
  <div id="a">
    <p>测试文字</p>
    <p>测试文字</p>
    <p>测试文字</p>
    <p>测试文字</p>
    <p>测试文字</p>
    <p>测试文字</p>
    <p>测试文字</p>
    <p>测试文字</p>
    <p>测试文字</p>
    <p>测试文字</p>
    <p>测试文字</p>
    <p>测试文字</p>
    <p>测试文字</p>
    <p>测试文字</p>
    <p>测试文字</p>
    <p>测试文字</p>
    <p>测试文字</p>
    <p>测试文字</p>
    <p>测试文字</p>
    <p>测试文字</p>
    <p>测试文字</p>
    <p>测试文字</p>
    <p>测试文字</p>
    <p>测试文字</p>
    <p>测试文字</p>
    <p>测试文字</p>
    <p>底部</p>
  </div>
</body>
</html>
<script type="text/javascript" src="/UploadFiles/2021-04-02/jquery.min.js">

高级应用(自定义滚动条背景及上下按钮):

调用图片:

jQuery实现的自定义滚动条实例详解

demo:

<!DOCTYPE HTML>
<html lang="en-US">
<head>
  <meta charset="UTF-8"/>
  <title>demo</title>
  <link rel="stylesheet" type="text/css" href="/css/base.min.css" media="all"/>
  <style type="text/css">
  #a{width:500px;overflow:hidden;position:relative;height:200px;background:#f5f5f5;}
  </style>
</head>
<body>
  <div id="a">
    <p>测试文字</p>
    <p>测试文字</p>
    <p>测试文字</p>
    <p>测试文字</p>
    <p>测试文字</p>
    <p>测试文字</p>
    <p>测试文字</p>
    <p>测试文字</p>
    <p>测试文字</p>
    <p>测试文字</p>
    <p>测试文字</p>
    <p>测试文字</p>
    <p>测试文字</p>
    <p>测试文字</p>
    <p>测试文字</p>
    <p>测试文字</p>
    <p>测试文字</p>
    <p>测试文字</p>
    <p>测试文字</p>
    <p>测试文字</p>
    <p>测试文字</p>
    <p>测试文字</p>
    <p>测试文字</p>
    <p>测试文字</p>
    <p>测试文字</p>
    <p>测试文字</p>
    <p>底部</p>
  </div>
</body>
</html>
<script type="text/javascript" src="/UploadFiles/2021-04-02/jquery.min.js">

jquery.jscroll.js:

/**
 *
 * Copyright (c) 2009 May(qq104010230)
 * http://www.winwill.com
 * http://www.winwill.com/jquery/jscroll.html
 * admin@winwill.com
 */
/*--------------------------------------------------------------------------------------------------*/
$.fn.extend({//添加滚轮事件//by jun
  mousewheel:function(Func){
    return this.each(function(){
      var _self = this;
      _self.D = 0;//滚动方向
      if($.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"15px"
            ,BgUrl:""
            ,Bg:"#efefef"
            ,Bar:{ Pos:"up"
                ,Bd:{Out:"#b5b5b5",Hover:"#ccc"}
                ,Bg:{Out:"#fff",Hover:"#fff",Focus:"orange"}}
            ,Btn:{ btn:true
                ,uBg:{Out:"#ccc",Hover:"#fff",Focus:"orange"}
                ,dBg:{Out:"#ccc",Hover:"#fff",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"hidden",position:"relative",padding:"0px"});
      var dw = $(_self).width(), dh = $(_self).height()-1;
      var sw = j.W ".jscroll-c").height()==null){//存在性检测
    $(_self).wrapInner("<div class='jscroll-c' style='top:0px;z-index:9999;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%;top:0px;right:0;-moz-user-select:none;position:absolute;overflow:hidden;z-index:10000;'><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;-moz-user-select:none;border:1px 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-2});
      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})})
      var sch = jscrollc.height();
      //var sh = Math.pow(dh,2) / sch ;//Math.pow(x,y)x的y次方
      var sh = (dh-2*bw)*dh / sch
      if(sh<10){sh=10}
      var wh = sh/6//滚动时候跳动幅度
    //  sh = parseInt(sh);
      var curT = 0,allowS=false;
      jscrollh.height(sh);
      if(sch<=dh){jscrollc.css({padding:0});jscrolle.css({display:"none"})}else{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},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});
            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();
      })
    });
  }
});

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希望本文所述对大家jQuery程序设计有所帮助。

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