本文实例讲述了JS动画效果打开、关闭层的实现方法。分享给大家供大家参考。具体如下：
<!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"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>层展开、关闭</title> <style type="text/css"> #main{ width:500px; margin:100px; height:500px;border:1px solid red } #test{ border:1px solid red; display:none;width:10px; height:10px; background:yellow } </style> </head> <body> <input type="button" value="打开" id="bt" /> <input type="button" value="关闭" id="bt1" /> <div id="main"><div id="test"></div> </div> </body> </html> <script type="text/javascript"> function $ (o) { return document.getElementById(o); } function XslideDown(obj,type,mX,num) { if(!type){return;} try{ var type1=type=="height""marginLeft"; var type2=type=="height""; XSetCss(obj,[type1,XgetOffset(obj)[type2]+"px"]); XSetCss(obj,[type,XgetOffset(obj)[type]+num+"px"]); if(XgetOffset(obj)[type]<mX){ setTimeout(function(){XslideDown(obj,type,mX,num);},10); } else{ XSetCss(obj,[type,mX]) } } catch(e){} } function XslideUp(obj,type,mX,num) { if(!type){return;} try{ var type1=type=="height""marginLeft"; var type2=type=="height""; XSetCss(obj,[type1,XgetOffset(obj)[type2]+"px"]); XSetCss(obj,[type,XgetOffset(obj)[type]-num+"px"]); if(XgetOffset(obj)[type]>mX){ setTimeout(function(){XslideUp(obj,type,mX,num);},1); } else{ XSetCss(obj,[type,mX]) obj.style.display="none"; } } catch(e){} } function XSetCss(obj,cssArgs){ if(arguments.length==2) { if(cssArgs.constructor==Object){ for(var o in cssArgs) { if(obj.style[o]!="undefiend") { obj.style[o]=cssArgs[o]; } } } if(cssArgs.constructor==Array&&cssArgs.length==2){ obj.style[cssArgs[0]]=cssArgs[1]; } } } function XgetOffset (obj) { return { height:obj.offsetHeight, width:obj.offsetWidth, top:parseInt((obj.parentNode.offsetHeight-obj.offsetHeight)/2), left:parseInt((obj.parentNode.offsetWidth-obj.offsetWidth)/2) } } function XopenDiv(o){ o.style.display="block"; XslideDown(o,"width",400,10); XslideDown(o,"height",400,10); } function XcloseDiv(o){ XslideUp(o,"width",10,10); XslideUp(o,"height",10,10); } $("bt").onclick=function(){ XopenDiv($("test")) } $("bt1").onclick=function(){ XcloseDiv($("test")) } </script>
希望本文所述对大家的javascript程序设计有所帮助。
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