導語：如何實現JavaScript的DIV塊來回滾動效果呢?下面是小編給大家提供的程式碼實現過程，大家可以參考閱讀，更多詳情請關注應屆畢業生考試網。
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<p id="xx" style=" position:relative;left:100px;width:100px;height:50px;border: solid 1px red;">指令碼之家</p>
<script type="text/javascript">
function ls(){
var p=true;//開關,true開,false關
var xx=lementById('xx');
var xxleft = parseInt();
var speed = 20;
var t=setInterval(rollRight,speed);
//向左移動
function rollLeft(){
if(p){
xxleft--;
= xxleft+'px';
if(xxleft <=0 ){
clearInterval(t);
t=setInterval(rollRight,speed);
}
}
}
//向右移動
function rollRight(){
if(p){
xxleft++;
= xxleft+'px';
if(xxleft >= 300){
clearInterval(t);
t=setInterval(rollLeft,speed);
}
}
}
}
ls();
</script>
</body>
</html>
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