jQuery实现360°全景拖动展示

html,body{background:#333;}
 #loading{left:0;top:0;width:100%;height:100%;background:#333;color:#fff;}
 #loading span{left:45%;top:40%;font:normal 50px Arial;color:#fff;}
 #demo{left:50%;top:50%;margin-left:-512px;margin-top:-384px;width:1024px;height:768px;}
 #demo img{border-radius:8px;border:5px solid #555;}
 .back{font-size:18px;line-height:130%;padding:8px 20px;color:#fff;}
 #back-home{left:0px;top:0px;background:#35916D;}
 #back-article{right:0px;top:0px;background:#444;}
 #back-download{right:0px;bottom:0px;background:#CE565D;}

<div id="demo" class="px hide"><img /></div>
<div id="loading" class="px"><span class="pa"></span></div>

<script src="scripts/jquery.js?1.11.1"></script>
<script src="scripts/jquery.drag360.js"></script>
<script>
$(function(){
    $(document.body).attr({
      'onSelectStart' :'return false;',
      'oncontextmenu':'return false;',
      'onbeforecopy':'return false;',
      'oncopy':'return false;',
      'ondragstart':'return false;',
      'style':'-moz-user-select:none; -khtml-user-select: none; user-select: none;'
    });
 var Preload=function(images,callback){
  var done=0,val=0;
  var count=images.length; 
  var preload=function(url) {
   var image = $("<img />").attr("src", url).on("load",function () {
    complete();
   });
   };
  var complete=function() {
   done++;
   val=done/count*100;
   $('#loading span').text(Math.ceil(val) + "%");
   if(done==count){
    callback();
   }
  };
  for(var i=0;i<images.length;i++){
   preload(images[i]);
  }
 };
 var images=[
   'drag/shiwai ceshi0006.jpg',
   'drag/shiwai ceshi0012.jpg',
   'drag/shiwai ceshi0018.jpg',
   'drag/shiwai ceshi0024.jpg',
   'drag/shiwai ceshi0030.jpg',
   'drag/shiwai ceshi0036.jpg',
   'drag/shiwai ceshi0042.jpg',
   'drag/shiwai ceshi0048.jpg',
   'drag/shiwai ceshi0054.jpg',
   'drag/shiwai ceshi0060.jpg',
   'drag/shiwai ceshi0066.jpg',
   'drag/shiwai ceshi0072.jpg',
   'drag/shiwai ceshi0078.jpg',
   'drag/shiwai ceshi0084.jpg',
   'drag/shiwai ceshi0090.jpg',
   'drag/shiwai ceshi0096.jpg',
   'drag/shiwai ceshi0102.jpg',
   'drag/shiwai ceshi0108.jpg',
   'drag/shiwai ceshi0114.jpg',
   'drag/shiwai ceshi0120.jpg',
   'drag/shiwai ceshi0126.jpg',
   'drag/shiwai ceshi0132.jpg',
   'drag/shiwai ceshi0138.jpg',
   'drag/shiwai ceshi0144.jpg',
   'drag/shiwai ceshi0150.jpg',
   'drag/shiwai ceshi0156.jpg',
   'drag/shiwai ceshi0162.jpg',
   'drag/shiwai ceshi0168.jpg',
   'drag/shiwai ceshi0174.jpg',
   'drag/shiwai ceshi0180.jpg',
   'drag/shiwai ceshi0186.jpg',
   'drag/shiwai ceshi0192.jpg',
   'drag/shiwai ceshi0198.jpg',
   'drag/shiwai ceshi0204.jpg',
   'drag/shiwai ceshi0210.jpg',
   'drag/shiwai ceshi0216.jpg',
   'drag/shiwai ceshi0222.jpg',
   'drag/shiwai ceshi0228.jpg',
   'drag/shiwai ceshi0234.jpg',
   'drag/shiwai ceshi0240.jpg',
   'drag/shiwai ceshi0246.jpg',
   'drag/shiwai ceshi0252.jpg',
   'drag/shiwai ceshi0258.jpg',
   'drag/shiwai ceshi0264.jpg',
   'drag/shiwai ceshi0270.jpg',
   'drag/shiwai ceshi0276.jpg',
   'drag/shiwai ceshi0282.jpg',
   'drag/shiwai ceshi0288.jpg',
   'drag/shiwai ceshi0294.jpg',
   'drag/shiwai ceshi0300.jpg',
   'drag/shiwai ceshi0306.jpg',
   'drag/shiwai ceshi0312.jpg',
   'drag/shiwai ceshi0318.jpg',
   'drag/shiwai ceshi0324.jpg',
   'drag/shiwai ceshi0330.jpg',
   'drag/shiwai ceshi0336.jpg',
   'drag/shiwai ceshi0342.jpg',
   'drag/shiwai ceshi0348.jpg',
   'drag/shiwai ceshi0354.jpg',
   'drag/shiwai ceshi0360.jpg',
 ];
 Preload(images,function(){
  $("#loading").fadeOut();
  $("#demo img").attr("src",images[0]);
  $("#demo").fadeIn();
  $("#demo img").drag360(images);
 });

});
</script>

(function($){
    $.fn.drag360=function(images){
        var mdx,mmx,isDrag=false,unitStep=40,current=0;
        var that=$(this);
        var length=images.length;
        //触摸 
        that.on('touchstart',function(e){
            var touch = e.originalEvent;
                mdx = touch.changedTouches[0].pageX;
                isDrag=true;
        }).on('touchmove',function(e){
            e.preventDefault();
            touch = e.originalEvent.touches[0]||e.originalEvent.changedTouches[0];
            mmx=touch.pageX;
            if(isDrag){
                if(Math.abs(mmx-mdx)>unitStep){
                    if(mmx-mdx>0){
                        current=current+1;
                    }else{
                        current=current-1;
                    }
                    mdx=mmx;
                    if(current<0)current=length-1;
                    if(current>length-1)current=0;
                    that.attr("src",images[current]);
                }
            }
        }).on('touchend',function(e){
            isDrag=false;
        });
        //拖动
        that.on('mousedown',function(e){
            mdx=e.pageX;
            isDrag=true;
        }).on('mousemove',function(e){
            mmx=e.pageX;
            if(isDrag){
                if(Math.abs(mmx-mdx)>unitStep){
                    current=current+(mmx-mdx>0?1:-1);
                    mdx=mmx;
                    if(current<0)current=length-1;
                    if(current>length-1)current=0;
                    that.attr("src",images[current]);
                }
            }
            return false;
        })
        $(document).on('mouseup',function(e){
            isDrag=false;
        });
        $(document).on('mouseleave',function(e){
            isDrag=false;
        });
        return this;
    };
})(jQuery);