<!DOCTYPE html> <html> <title>简单拖曵原理实例</title> <script language="javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js"></script> <script type="text/javascript"> $(function(){ //样式 $("#drag").css({"position":"absolute","top":"100px","left":"100px","border":"1px solid #789","width":"150px","height":"90px","background":"#988f82","cursor":"move"}) /*+++++ 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"></div> </body> </html>
