两侧跟随的广告
程序员文章站
2022-03-20 15:46:38
跟随的广告 
跟随的广告
<style>
img{
position: absolute;
left:0;
top:50px;
}
#demo{
width:1000px;
margin:0 auto;
}
</style>
</head>
<body>
<img src="images/aside.jpg" alt="" id="pic"/>
<div id="demo">
<p>天王盖地虎，小鸡炖蘑菇</p>
<p>天王盖地虎，小鸡炖蘑菇</p>
<p>天王盖地虎，小鸡炖蘑菇</p>
<p>天王盖地虎，小鸡炖蘑菇</p>
<p>天王盖地虎，小鸡炖蘑菇</p>
<p>天王盖地虎，小鸡炖蘑菇</p>
<p>天王盖地虎，小鸡炖蘑菇</p>
<p>天王盖地虎，小鸡炖蘑菇</p>
<p>天王盖地虎，小鸡炖蘑菇</p>
<p>天王盖地虎，小鸡炖蘑菇</p>
<p>天王盖地虎，小鸡炖蘑菇</p>
<p>天王盖地虎，小鸡炖蘑菇</p>
<p>天王盖地虎，小鸡炖蘑菇</p>
<p>天王盖地虎，小鸡炖蘑菇</p>
<p>天王盖地虎，小鸡炖蘑菇</p>
<p>天王盖地虎，小鸡炖蘑菇</p>
<p>天王盖地虎，小鸡炖蘑菇</p>
<p>天王盖地虎，小鸡炖蘑菇</p>
<p>天王盖地虎，小鸡炖蘑菇</p>
<p>天王盖地虎，小鸡炖蘑菇</p>
<p>天王盖地虎，小鸡炖蘑菇</p>
<p>天王盖地虎，小鸡炖蘑菇</p>
<p>天王盖地虎，小鸡炖蘑菇</p>
<p>天王盖地虎，小鸡炖蘑菇</p>
<p>天王盖地虎，小鸡炖蘑菇</p>
<p>天王盖地虎，小鸡炖蘑菇</p>
<p>天王盖地虎，小鸡炖蘑菇</p>
<p>天王盖地虎，小鸡炖蘑菇</p>
<p>天王盖地虎，小鸡炖蘑菇</p>
<p>天王盖地虎，小鸡炖蘑菇</p>
<p>天王盖地虎，小鸡炖蘑菇</p>
<p>天王盖地虎，小鸡炖蘑菇</p>
<p>天王盖地虎，小鸡炖蘑菇</p>
<p>天王盖地虎，小鸡炖蘑菇</p>
<p>天王盖地虎，小鸡炖蘑菇</p>
<p>天王盖地虎，小鸡炖蘑菇</p>
</div>
</body>
</html>
<script type="text/javascript">
var pic = document.getelementbyid("pic");
var pict = pic.offsettop; //50
window.onscroll = function(){
var stop = document.documentelement.scrolltop || document.body.scrolltop;
//img它的top值要运动多少？ 目标dis
var dis = pict + stop;
move(pic,dis);
}
var timer = null;
function move(obj,target){
clearinterval(timer);
timer = setinterval(function(){
var speed = target - obj.offsettop > 0 ? 5 : -5;
if(math.abs(target - obj.offsettop) < 5){
obj.style.top = target + "px";
clearinterval(timer);
return
}
obj.style.top = speed + obj.offsettop + "px";
},20)
}
</script>
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