js跑马灯代码(自写)

function cls_marquee(id,id1,id2,sp){
this.obj_id=id;
this.obj_id1=id1;
this.obj_id2=id2;
this.speed=sp;
eval(this.obj_id2+".innerHTML="+this.obj_id1+".innerHTML");
function Marquee(){
if(eval(id2).offsetTop-eval(id).scrollTop<=0)
eval(id).scrollTop-=eval(id1).offsetHeight
else{
eval(id).scrollTop++
}
}
var MyMar=setInterval(Marquee,sp)
eval(this.obj_id).onmouseover=function() {clearInterval(MyMar)}
eval(this.obj_id).onmouseout=function() {MyMar=setInterval(Marquee,sp)}
}

<script type="text/javascript" >
function show() {
var info = document.getElementById('Text1');
info.value = info.value.substr(1) + info.value[0];
}
setInterval(show, 500);
function show1() {
var info1 = document.getElementById('Text2');
info1.value = info1.value[info1.value.length-1] + info1.value.substr(0, info1.value.length-1);
}
setInterval(show1, 500);
</script>
<input id="Text1" type="text" value="欢迎来测试" />
<input id="Button1" type="button" value="滚动"/><br />
<input id="Text2" type="text" value="北京欢迎您" />
<input id="Button2" type="button" value="滚动" onclick="show1()" />