Example code to implement seamless upward scrolling of news list based on JS

Example code to implement seamless upward scrolling of news list based on JS_javascript skills

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Release： 2016-05-16 15:18:53

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When there is a lot of news and it is unprecedentedly limited, using scrolling is a good choice. This chapter will introduce how to achieve this effect through code examples.

Code examples are as follows:

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="author" content="http://www.jb51.net/" />
<title>文字列表无缝向上滚动代码</title>
<style type="text/css">
*{
margin:0px;
padding:0px;
border:0px;
}
body{font-size:12px}
#demo{
overflow:hidden;
height:80px;
width:280px;
margin:90px auto;
position:relative;
}
#demo1{
height:auto;
text-align:left;
}
#demo2{
height:auto;
text-align:left;
}
#demo1 li{
list-style-type:none;
height:22px;
text-align:left;
text-indent:15px;
}
#demo2 li{
list-style-type:none;
height:22px;
text-align:left;
text-indent:15px;
}
</style>
<script type="text/javascript"> 
var speed=40 
window.onload=function(){
var demo=document.getElementById("demo"); 
var demo2=document.getElementById("demo2"); 
var demo1=document.getElementById("demo1"); 
demo2.innerHTML=demo1.innerHTML 
function Marquee(){ 
if(demo.scrollTop>=demo1.offsetHeight){
demo.scrollTop=0; 
}
else{ 
demo.scrollTop=demo.scrollTop+1;
} 
} 
var MyMar=setInterval(Marquee,speed) 
demo.onmouseover=function(){clearInterval(MyMar)} 
demo.onmouseout=function(){MyMar=setInterval(Marquee,speed)} 
}
</script>
</head>
<body>
<div id="demo">
<ul id="demo1">
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<li><a href="#" target="_blank">只有努力才会有美好的明天</a></li>
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</ul>
<div id="demo2"></div>
</div>
</body>
</html>

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The above code implements the scrolling effect of the news list. The implementation process is introduced below:

1. Implementation principle:

The general principle is as follows. There are two sub-elements demo1 and demo2 in the demo element, and the content in demo1 is stored in demo2. The reason for doing this is so that demo2 can follow demo1 when scrolling upward. Otherwise, it will not be seamless scrolling, but seamless scrolling. When the content of demo1 is completely blocked, that is, when demo1 is completely scrolled up, demo2 will be exactly at the position where demo1 starts to scroll, and then the scrollTop value of demo will be reset. , let the scrolling start over, thus achieving a seamless scrolling effect.

This is the example code to implement seamless upward scrolling of news list based on JS. I hope you can apply this code according to your actual needs.