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  • jquery简单的拖动效果

    <!DOCTYPE html>
    <html>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <title>简单拖曵原理实例</title>
    	<style type="text/css">
        	#drag{400px;height:300px;background:url(http://upload.yxgz.cn/uploadfile/2009/0513/20090513052611873.jpg);cursor:move;position:absolute;top:100px;left:100px;border:solid 1px #ccc;}
    		h2{color:#fff;background: none repeat scroll 0 0 rgba(16, 90, 31, 0.7);color:#FFFFFF;height:40px;line-height:40px;margin:0;}
        </style>
    	<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js" type="text/javascript"></script>
        <script type="text/javascript">
            $(function(){
                /*--------------拖曳效果----------------
                *原理:标记拖曳状态dragging ,坐标位置iX, iY
                *         mousedown:fn(){dragging = true, 记录起始坐标位置,设置鼠标捕获}
                *         mouseover:fn(){判断如果dragging = true, 则当前坐标位置 - 记录起始坐标位置,绝对定位的元素获得差值}
                *         mouseup:fn(){dragging = false, 释放鼠标捕获,防止冒泡}
                */
                var dragging = false;
                var iX, iY;
                $("#drag").mousedown(function(e) {
                    dragging = true;
                    iX = e.clientX - this.offsetLeft;
                    iY = e.clientY - this.offsetTop;
                    this.setCapture && this.setCapture();
                    return false;
                });
                document.onmousemove = function(e) {
                    if (dragging) {
                    var e = e || window.event;
                    var oX = e.clientX - iX;
                    var oY = e.clientY - iY;
                    $("#drag").css({"left":oX + "px", "top":oY + "px"});
                    return false;
                    }
                };
                $(document).mouseup(function(e) {
                    dragging = false;
                    $("#drag")[0].releaseCapture();
                    e.cancelBubble = true;
                })
    
            })
    
        </script>
    </head>
    
    <body>
        <div id="drag">
        	<h2>来拖动我啊</h2>
        </div>
    </body>
    </html>
    


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  • 原文地址:https://www.cnblogs.com/aukle/p/3220260.html
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