演示效果--在图片上按住鼠标移动图片
1 把如下代码复制到<head>与</head>之间 <style type="text/css"> <!-- #pic { width:480px; height:320px; border: 3px solid #ccc; background-image: url(images/butong_net.jpg); background-repeat: no-repeat; background-position: 0px 0px; cursor: move; } --> </style> <script type="text/javascript"> <!-- var p = new Array(); var speed = 0.05; //速度 var picWidth = 1280; // 大图的宽高 var picHeight = 971; var x,y // 鼠标点下去时背景的坐标 var x_new,y_new //位移 var haveclick = false; function getmouseposition(event) { if(document.all) { x = document.body.scrollLeft+event.clientX; y = document.body.scrollTop+event.clientY; }else { x = event.layerX; y = event.layerY; } haveclick = true; } function movestop() { haveclick = false; } function movestart(event) { if(haveclick) { if(document.getElementById('pic').style.backgroundPosition.length==0) {document.getElementById('pic').style.backgroundPosition="0px 0px";} p = document.getElementById('pic').style.backgroundPosition.split(" ") if(document.all) { x_new = document.body.scrollLeft+event.clientX; y_new = document.body.scrollTop+event.clientY; }else { x_new = event.layerX; y_new = event.layerY; } x2 = (speed*(x_new-x)+parseInt(p[0])).toString(10); // 计算位移量 y2 = (speed*(y_new-y)+parseInt(p[1])).toString(10); if (x2<-picWidth+420) x2=-picWidth+420; if (y2>0) y2=0; if (x2>0) x2=0; if (y2<-picHeight+300) y2=-picHeight+300; document.getElementById('pic').style.backgroundPosition=x2+"px "+y2+"px"; } } --> </script> 2 把如下代码复制到<body>与</body>之间 <div id="pic" onmousedown="getmouseposition(event)" onmousemove="movestart(event)" onmouseup="movestop()" onmouseout="movestop()"> </div>