无缝滚动 封装代码

<script>

function wfgd(a,b,c,d){
    var a=document.getElementById(a);
    var b=document.getElementById(b);
    var c=document.getElementById(c);
    var d=d||20;
    var Auto=null;
        c.innerHTML=b.innerHTML;
        function auto(){
            if(a.scrollLeft>b.offsetWidth){
            a.scrollLeft-=b.offsetWidth;
            }else{
            a.scrollLeft++        
            }
        }
    Auto = setInterval(function(){auto()},d);
    a.onmouseover=function(){
        clearInterval(Auto)
    }
    a.onmouseout=function(){
        Auto = setInterval(function(){auto()},d);
    }
}
wfgd("scroll","all01","all02") 传入参数 id

</script>