本文实例讲述了JS带缓冲效果打开、关闭、移动一个层的方法。分享给大家供大家参考。具体实现方法如下：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" lang="gb2312"> <head> <title>JavaScript缓冲打开层</title> <meta http-equiv="Content-Type" content="text/html; charset=gb2312"/> <style type="text/css"> * { margin:0; padding:0; } body { margin:5px auto; text-align:center; background:#f0f0f0; } #d1 { position:absolute; top:20px; left:20px; width:100px; height:60px; border:1px solid #808; } #d2 { position:absolute; top:100px; left:20px; width:100px; height:60px; border:1px solid #808; } #open1, #close1, #open2, #close2 { cursor:pointer; background:#ccf; margin:5px; } #open1, #open2 { display:block; } #close1, #close2 { display:none; } </style> </head> <body> <div id="d1"> 移动位置 <span id="open1">Open</span> <span id="close1">Close</span> </div> <div id="d2"> 改变大小 <span id="open2">Open</span> <span id="close2">Close</span> </div> <div id="debug">AAA</div> <script type="text/javascript"> //<[CDATA[ var sl = 20; //初始left值 var el = 500; //结束left值 var sw = 100;//初始width值 var ew = 580;//结束width值 var p = 10; //缓冲变量 var t = 20; //时间变量 var d1 = document.getElementById('d1'); var d2 = document.getElementById('d2'); var debug = document.getElementById('debug'); var open1 = document.getElementById('open1'); var close1 = document.getElementById('close1'); var open2 = document.getElementById('open2'); var close2 = document.getElementById('close2'); function fo1() { var cl = parseInt(getStyle(d1,'left')); //当前left值 if (cl<el) { d1.style.left = cl + Math.ceil((el-cl)/p) + 'px'; //当前值+缓冲增量 debug.innerHTML = getStyle(d1,'left'); //cl + 'px'; setTimeout('fo1()', t); } else { d1.style.left = el + 'px'; open1.style.display = 'none'; close1.style.display = 'block'; } } function fc1() { var cl = parseInt(getStyle(d1,'left')); //当前left值 if (cl>sl) { d1.style.left = cl - Math.ceil((cl-sl)/p) + 'px'; //当前值-缓冲增量 debug.innerHTML = getStyle(d1,'left'); //cl + 'px'; setTimeout('fc1()', t); } else { d1.style.left = sl + 'px'; open1.style.display = 'block'; close1.style.display = 'none'; } } function fo2() { var cw = parseInt(getStyle(d2,'width')); //当前width值 if (cw<ew) { d2.style.width = cw + Math.ceil((ew-cw)/p) + 'px'; //当前值+缓冲增量 debug.innerHTML = getStyle(d2,'width'); //cw + 'px'; setTimeout('fo2()', t); } else { d2.style.width = ew + 'px'; open2.style.display = 'none'; close2.style.display = 'block'; } } function fc2() { var cw = parseInt(getStyle(d2,'width')); //当前width值 if (cw>sw) { d2.style.width = cw - Math.ceil((cw-sw)/p) + 'px'; //当前值-缓冲增量 debug.innerHTML = getStyle(d2,'width'); //cw + 'px'; setTimeout('fc2()', t); } else { d2.style.width = sw + 'px'; open2.style.display = 'block'; close2.style.display = 'none'; } } function getStyle( elem, name ) { if (elem.style[name]) { return elem.style[name]; } else if (elem.currentStyle) { return elem.currentStyle[name]; } else if (document.defaultView && document.defaultView.getComputedStyle){ name = name.replace(/([A-Z])/g,"-$1"); name = name.toLowerCase(); var s = document.defaultView.getComputedStyle(elem,""); return s && s.getPropertyValue(name); } else { return null; } } //]]> </script> </body> </html>
希望本文所述对大家的javascript程序设计有所帮助。