var ii=-1;
var speed=1;
var fangxiang=1;
 
var demo=document.getElementById('demo');
var demo1=document.getElementById('demo1');
var demo2=document.getElementById('demo2');
 
demo2.innerHTML=demo1.innerHTML
function andyzsy(){
if (ii==1)return
for(i=1;i<=speed;i++)
{
if(fangxiang=="2")
{
demo.scrollLeft=demo.scrollLeft-1;
if(demo.scrollLeft=="0")
demo.scrollLeft=demo1.offsetWidth
}
else
{
demo.scrollLeft++
 
if(demo.scrollLeft>=demo1.offsetWidth)
demo.scrollLeft=0
}
}
}
function setspeed(x)
{
speed=x;
}
function setfangxiang(x)
{
fangxiang=x;
}
setInterval(andyzsy,30)