学校常用对联广告代码

js代码如下,请另存为 x.js 文件然后在目标页面引用.此代码兼容各浏览器,符号w3c标准.绝对可用.
Javascript代码
function couplet(){
if(arguments.length>=1) this.objID = document.getElementById(arguments[0]);
if(arguments.length>=2) this.divTop = arguments[1];
if(arguments.length>=3) this.divPlane = arguments[2];
if(arguments.length>=4) this.scrollDelay = arguments[4];
if(arguments.length>=5) this.waitTime = arguments[5];
if(!this.objID){
alert("对象名【"+ arguments[0] +"】无效，对联无法初始化，请检查对象名称是否正确！");
this.objID = null; return;
}else{
this.objID.style.position="absolute";
this.objID.style.display="block";
this.objID.style.zIndex=9999;
}
if("" == this.objID.style.top){
if(isNaN(this.divTop)){
alert("对象垂直位置(top)参数必须为数字。"); return;
}else{
this.objID.style.top = this.divTop+"px";
}
}
if("" == this.objID.style.left && "" == this.objID.style.right){
if(isNaN(this.divPlane)){
alert("对象水平位置(left||right)参数必须为数字。"); return;
}
if(this.divPlane>0) this.objID.style.left = this.divPlane+"px";
if(this.divPlane<0) this.objID.style.right = Math.abs(this.divPlane)+"px";
}
if(this.scrollDelay<15 || isNaN(this.scrollDelay)) this.scrollDelay = 15;
if(this.waitTime<500 || isNaN(this.waitTime)) this.waitTime = 500;
if(arguments.length>=1) this.start();
}
couplet.prototype.start = function(){
if(null == this.objID) return;
var objCouplet = this;
timer = this.scrollDelay;
objCouplet.lastScrollY = 0;
objCouplet.timerID = null;
objCouplet.startID = function(){
if("block" == objCouplet.objID.style.display){
objCouplet.run();
}else{
clearInterval(objCouplet.timerID);
}
}
objCouplet.Begin = function(){
objCouplet.timerID = setInterval(objCouplet.startID,timer);
}

setTimeout(objCouplet.Begin,this.waitTime);
}
couplet.prototype.run = function(){
if(document.documentElement && document.documentElement.scrollTop){
uu_scrY = parseFloat(document.documentElement.scrollTop);
}else if(document.body){
uu_scrY = parseFloat(document.body.scrollTop);
}
uu_divX = parseFloat(this.objID.style.top.replace("px",""));
uu_curTop = .1 * (uu_scrY - this.lastScrollY);
uu_curTop = uu_curTop>0?Math.ceil(uu_curTop):Math.floor(uu_curTop);
this.objID.style.top = parseFloat(uu_divX + uu_curTop) + "px";
this.lastScrollY += uu_curTop;
}

在目标页面使用方法:
Html代码
<script type="text/javascript" src="skin/js/fddl.js"></script>
<script type="text/javascript">
function floatjs(){
new couplet("maple1",50,1);
new couplet("maple2",50,-1);
}
if( window.addEventListener) window.addEventListener('load',floatjs,false);
else window.attachEvent('onload',floatjs);
</script>
<div id="maple1">
<div>
<img src="images/1.gif" style="max-width: 100%;height: auto;" border="0" />
</div>
</div>
<div id="maple2">
<div>
<img src="images/2.gif" style="max-width: 100%;height: auto;" border="0" />
</div>
</div>