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jquery實(shí)現(xiàn)拖動效果（代碼分享）

更新時(shí)間：2017年01月25日 09:49:43 作者：艾瑞卡

本文主要分享了jquery實(shí)現(xiàn)拖動效果的示例代碼。具有很好的參考價(jià)值，下面跟著小編一起來看下吧

話不多說，請看代碼：

<!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">自己動手試試</div>
 <div class="drag-body">
 點(diǎn)擊鼠標(biāo)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; //拖動過的位置距離上邊
 _drag.left = 0; //拖動過的位置距離左邊
 _drag.maxLeft; //距離左邊最大的距離
 _drag.maxTop; //距離上邊最大的距離
 _drag.dragging = false; //是否拖動標(biāo)志
 //拖動函數(shù)
 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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