jquery簡單的拖動效果
阿新 • • 發佈：2019-01-02
<!DOCTYPE html> <html> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>簡單拖曵原理例項</title> <style type="text/css"> #drag{width: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：標記拖曳狀態dragging ,座標位置iX, iY * mousedown:fn(){dragging = true, 記錄起始座標位置，設定滑鼠捕獲} * mouseover:fn(){判斷如果dragging = true, 則當前座標位置 - 記錄起始座標位置，絕對定位的元素獲得差值} * mouseup:fn(){dragging = false, 釋放滑鼠捕獲，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>來拖動我啊</h2> </div> </body> </html>