How to implement the scroll bar effect using JavaScript

This article mainly introduces how to implement the scrolling bar effect in JavaScript. it involves some techniques related to javascript operations on html elements to implement scrolling, which is of great practical value, for more information about how to implement the scroll bar effect of JavaScript, see the example in this article. Share it with you for your reference. The details are as follows:

    
       《script》   window.onload=function(){    var oDiv=document.getElementById('p1');    var oUl=oDiv.getElementsByTagName('ul')[0];    var oLi=oUl.getElementsByTagName('li');    var oLeft=document.getElementById('leftDiv');    var oright=document.getElementById('rightDiv');    oUl.innerHTML+=oUl.innerHTML;    oUl.style.width=oLi[0].offsetWidth*oLi.length+'px';    var speed=-2;    function move(){     if (oUl.offsetLeft<-oUl.offsetWidth/2){      oUl.style.left='0';     }else if(oUl.offsetLeft>0){      oUl.style.left=-oUl.offsetWidth/2+'px';     }     oUl.style.left=oUl.offsetLeft+speed+'px';    };    var timer=setInterval(move,30);    oLeft.onclick=function(){     speed=-2;    };    oright.onclick= function () {     speed=2;    };    oUl.onmouseover=function(){     clearInterval(timer);    };    oUl.onmouseout=function(){     timer=setInterval(move,30);    };   }  《script》   
  
  
   
 
 
    
  
  
    
  
  
    
  
  
    
  
  
   
 
 
  
  
 
  

I hope this article will help you design javascript programs.