jquery实现拖动效果（代码分享）

话不多说，请看代码：
<！DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>Document</title></head><body> <style type="text/css"> .page{text-align:left;} .dragDiv{border:1px solid #ddd; padding:10px; width:300px; margin:0 auto; border-radius:4px; box-shadow:0 1px 2px #fefefe; position: fixed;} </style> <div class="dragDiv" id="drag"> <div class="drag-head">自己动手试试</div> <div class="drag-body"> 点击鼠标拖拖看 </div> </div></body><script src="http://apps.bdimg.com/libs/jquery/2.1.4/jquery.min.js"></script><script> var _drag = {}; _drag.top = 0; //拖动过的位置距离上边 _drag.left = 0; //拖动过的位置距离左边 _drag.maxLeft; //距离左边最大的距离 _drag.maxTop; //距离上边最大的距离 _drag.dragging = false; //是否拖动标志 //拖动函数 function bindDrag（el）{var winWidth = $（window）.width（）, winHeight =$（window）.height（）,objWidth = $（el）.outerWidth（）, objHeight = $（el）.outerHeight（）; _drag.maxLeft = winWidth - objWidth, _drag.maxTop = winHeight - objHeight; var els = el.style,x=0,y=0; var objTop = $（el）.offset（）.top, objLeft = $（el）.offset（）.left; $（el）.mousedown（function（e）{_drag.dragging = true; _drag.isDragged = true; x = e.clientX - el.offsetLeft;y = e.clientY - el.offsetTop;el.setCapture && el.setCapture（）;$（document）.bind（"mousemove",mouseMove）.bind（"mouseup",mouseUp）; return false; }）;function mouseMove（e）{e = e || window.event; if（_drag.dragging）{ _drag.top = e.clientY - y;_drag.left = e.clientX - x; _drag.top = _drag.top > _drag.maxTop ? _drag.maxTop : _drag.top; _drag.left = _drag.left > _drag.maxLeft ? _drag.maxLeft : _drag.left; _drag.top = _drag.top < 0 ? 0 : _drag.top; _drag.left = _drag.left <0 ? 0 : _drag.left; els.top = _drag.top + "px";els.left = _drag.left+ "px"; return false; } }function mouseUp（e）{_drag.dragging = false;el.releaseCapture && el.releaseCapture（）;e.cancelBubble = true; $（document）.unbind（"mousemove",mouseMove）.unbind（"mouseup",mouseUp）;} $（window）.resize（function（）{ var winWidth = $（window）.width（）, winHeight = $（window）.height（）, el = $（el）, elWidth = el.outerWidth（）, elHeight = el.outerHeight（）, elLeft = parseFloat（el.css（"left"））, elTop = parseFloat（el.css（"top"））; _drag.maxLeft = winWidth - elWidth; _drag.maxTop = winHeight - elHeight; _drag.top = _drag.maxTop < elTop ? _drag.maxTop : elTop; _drag.left = _drag.maxLeft < elLeft ? _drag.maxLeft : elLeft; el.css（{ top:_drag.top, left:_drag.left }） }） }bindDrag（document.getElementById（"drag"））;</script></html>
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