js代码

<script language="javascript">
var ph=document.getElementById("phone");
var otime=null;
var num=-300;
function tomove(){
	
	otime=setInterval(function (){
		num+=10;
		if(num==1100)
		{
			num=-300;
			clearInterval(otime);
		}
		ph.style.backgroundPosition=num+"px 0px";
		
		},20)
	}
tomove();
setInterval(function(){
	tomove();	
},3000);
</script>