div拖拽效果 JQuery

 1 <!DOCTYPE html>
 2 <html>
 3 <head>
 4 <meta name="description" content="jQuery拖拽div" />
 5   <meta charset="utf-8">
 6   <title>JS Bin</title>
 7   <style>
 8     #div{ width:200px; height:200px; background:#ccc; position:absolute;}
 9 #div h1{ height:30px; line-height:30px; font-size:12px; text-align:center;background: #f1f1f1;border-bottom: 1px solid #ccc;}
10   </style>
11   <script type="text/javascript" src="http://lib.sinaapp.com/js/jquery/1.10.2/jquery-1.10.2.js"></script>
12   
13 </head>
14 <body>
15   <div id="div"><h1>标题</h1></div>
16 <script>
17   $.fn.setDrag = function(options){
18     var defaults = {
19     },
20         that    = $(this),
21         opts    = $.extend({}, defaults, options),
22         doc     = $(document),
23         width   = $(window).width(),
24         height  = $(window).height(),
25         startX  = 0,
26         startY  = 0,
27         lastX   = 0,
28         lastY   = 0,
29         box     = that.parent(), // handler.parentNode
30         handler = that[0],
31         drag    = {
32             down: function(e){
33                 that.css('cursor', 'move');
34                 startX            = e.clientX - parseInt(box.css('left'));
35                 startY            = e.clientY - parseInt(box.css('top'));
36                 this.setCapture && this.setCapture(); // IE to prevent fast drag losing of object
37                 doc.on('mousemove', drag.move);
38                 doc.on('mouseup', drag.up);
39                 return false; // chrome to prevent rolling screen, and the loss of the mouse move style
40             },
41             move: function(e){
42                 lastX             = e.clientX - startX;
43                 lastY             = e.clientY - startY;
44                 lastX             = Math.max(0, Math.min(width - box.outerWidth(), lastX));
45                 lastY             = Math.max(0, Math.min(height - box.outerHeight() - 1, lastY));
46                 box.css({'top': lastY + 'px', 'left': lastX + 'px'});
47                 window.getSelection ? window.getSelection().removeAllRanges() : document.selection.empty(); // cancel the selected text
48                 e.stopPropagation();
49             },
50             up: function(){
51                 // that.css('cursor', 'auto');
52                 doc.off('mousemove', drag.move);
53                 doc.off('mouseup', drag.up);
54                 handler.releaseCapture && handler.releaseCapture(); // IE to prevent fast drag losing of object
55             }
56         };
57     that.on('mousedown', drag.down);
58 }
59 
60 $('#div h1').setDrag();
61 </script>  
62 
63 </body>
64 </html>
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