                        課程
                    
                        /前端開發(fā)
                        
                            /JavaScript
                        
                        /信息滾動效果制作

有人能幫我看下代碼嗎 JS沒任何報錯就是滾不起來 scrollTop的值一直是0 賦值居然沒用！

<html>
<head>
????<meta?charset="UTF-8">
????<title>信息滾動條</title>

<style?type="text/css">
*{
????margin:?0;
????padding:?0;
}????
ul{
????list-style:?none;
}
a?{
????color:?#333;
????text-decoration:?none;?????/*?超鏈接樣式?*/
}
a:hover?{
????color:?#ff0000;
}
.info-box{
????width:?300px;
????height:?200px;
????margin:?150px?auto;
????border:?2px?solid?gray;
????border-radius:?25px;
????background:?pink;
????overflow:?hidden;
}
.box-title{
????width:100%;
????height:?40px;
????line-height:?40px;
????background:?yellow;
????border-top-left-radius:?25px;
????border-top-right-radius:25px;?
????color:gray;
????font-size:?20px;
????text-indent:?35px;
????overflow:?hidden;
}
#box_content{
????width:?240px;
????height:?240px;
????margin:?0?auto;
????background:?green;
}
#box_content?ul?li{
????height:?40px;
}
#box_content?ul?li?a{
????float:?left;
????display:?block;
????width:?180px;
????height:?40px;
????overflow:?hidden;
}

#box_content?ul?li?span{
????float:?right;
????color:?#999;
}
</style>


</head>
<body>
????<div>
????????<div>奧萊蕾西亞</div>

????????<div?id="box_content">
????????????<ul?id="info_one">
????????????????<li><a?href="#">1.讓我掉下眼淚的</a><span>time</span></li>
????????????????<li><a?href="#">2.不是昨夜的酒。</a><span>time</span></li>
????????????????<li><a?href="#">3.讓我依依不舍的，</a><span>time</span></li>
????????????????<li><a?href="#">4.不止你的溫柔。</a><span>time</span></li>
????????????????<li><a?href="#">5.余路還要走多久,</a><span>time</span></li>
????????????????<li><a?href="#">6.你攥著我的手。</a><span>time</span></li>
????????????</ul>
????????????<ul?id="info_two"></ul>
????????</div>
????</div>

????<script?type="text/javascript">
????????var?content?=?document.getElementById('box_content');
????????var?info?=?document.getElementById("info_one");
????????var?info2?=?document.getElementById("info_two");????
????????content.scrollTop?=?20;
????????alert(content.scrollTop);

????????var?speed?=?50;
????????content.scrollTop?=?0;
????????info2.innerHTML?=?info.innerHTML;
?????????function?scrollUp(){
?????????????if(content.scrollTop?>=?info.scrollHeight)?{
?????????????????content.scrollTop?=?0;
?????????????????}else{
???????????????????content.scrollTop?++;?
?????????????????}?
????????}
????????var?myScroll?=?setInterval("scrollUp()",speed);
????????content.onmouseover?=?function(){
?????????????clearInterval(myScroll);
????????????}
????????content.onmouseout?=?function(){
?????????????myScroll?=?setInterval("scrollUp()",speed);
????????????}
????</script>
</body>
</html>