用鼠标拖动代替滚动条拖动

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <title>无标题文档</title>
    <script type="text/javascript" src="jquery.min.js"></script>
    <script language="javascript">
        //设定整体框架适应屏幕大小
        function setFrame(){
            $("#dragWrap").width($('body').width());
            $("#dragBody").width($('body').width());
            $("#dragWrap").height($(document).height()-50);
        }
        
        $(document).ready(function (){
            setFrame();//加载时，重设框架高宽度
            
            //鼠标移动操作
            var drag = function drag(){
             this.dragWrap = $("#dragWrap");
            this.init.apply(this,arguments);
            };
            drag.prototype = {
              constructor:drag,
              _dom : {},
              _x : 0,
              _y : 0,
              _top :0,
              _left: 0,
              move : false,
              down : false,
              init : function () {
                this.bindEvent();
              },
              bindEvent : function () {
                var t = this;
                $('body').on('mousedown','#dragWrap',function(e){
                  e && e.preventDefault();
                  if ( !t.move) {
                    t.mouseDown(e);
                  }
                });
                $('body').on('mouseup','#dragWrap',function(e){
                  t.mouseUp(e);
                });

                $('body').on('mousemove','#dragWrap',function(e){
                  if (t.down) {
                    t.mouseMove(e);
                  }
                });
              },
              mouseMove : function (e) {
                e && e.preventDefault();
                this.move = true;
                var x = this._x - e.clientX,
                    y = this._y - e.clientY,
                    dom = $('#dragWrap');
                dom.scrollLeft(this._left + x);
                dom.scrollTop(this._top + y);
              },
              mouseUp : function (e) {
                e && e.preventDefault();
                this.move = false;
                this.down = false;
                this.dragWrap.css('cursor','');
              },
              mouseDown : function (e) {
                this.move = false;
                this.down = true;
                this._x = e.clientX;
                this._y = e.clientY;
                this._top = $('#dragWrap').scrollTop();
                this._left = $('#dragWrap').scrollLeft();
                this.dragWrap.css('cursor','move');
              }
            };
            var drag = new drag();
            
        });
    </script>

    <style type="text/css">
        *{margin:0;padding:0;}
        html{background-color:#fff;}
        body{position:relative;height:100%;font-size:12px;font-family:"Microsoft YaHei";_font-family:"SimSun";}
        img,a:hover img{border:none;}
        a{text-decoration:none;color:#000;cursor:pointer;}
        ul,li{list-style:none;}
        #leftBar{width:0.9%;height:99.1%;top:0.9%;left:0.08%;}
        #dragWrap{position:relative;overflow:hidden;padding-top:50px;}
        #dragWrap img{vertical-align:top;}
        #dragBody{width:6974px;position:absolute;zoom:1;}
    </style>

</head>

<body>
    <div id="dragWrap">
        <div id="dragBody">
            <img src="big.jpg" style="6974px;height:4000px;" alt="" />
        </div>
    </div>
</body>
</html>
此段代码实现了用鼠标拖动，代替滚动条拖动的效果，非常适合触摸屏使用。