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js implementation of simple left and right fixed advertising effect examples_javascript skills

WBOYOriginal: 2016-05-16 16:05:011288browse

The example in this article describes how to achieve a simple fixed advertising effect on the left and right sides using js. Share it with everyone for your reference. The specific analysis is as follows:

Most websites have fixed advertising spaces on the left and right sides. The following is the simplest code to achieve this effect. There may be a little jitter when scrolling under IE. This problem will be solved later. Let’s implement it first.

Point 1:

var adtop = adleft.offsetTop;

Get the position of the element from the top, which is needed when scrolling.

Point 2:

Copy code The code is as follows:

adleft.style.top=adtop (document.documentElement. scrollTop || document.body.scrollTop) "px";

When scrolling, the value assigned to the top position of the element is the distance between the element itself and the top plus the scrolling distance.

Above code:

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>无标题文档</title>
<style>
body{margin:0; padding:0}
#adleft,#adright{
width:30px;
height:100px;
padding:20px;
font:14px/20px arial;
text-align:center;
background:#06c;
position:absolute;
cursor:pointer;
color:#fff
}
#adleft{left:0; top:150px; }
#adright{right:0; top:150px;}
</style>
<script>
window.onload = function(){
 var adleft = document.getElementById("adleft");
 var adright = document.getElementById("adright");
 var adtop = adleft.offsetTop;
 window.onscroll = function(){
  adleft.style.top = adtop + (document.documentElement.scrollTop || document.body.scrollTop) +"px"; 
  adright.style.top = adtop + (document.documentElement.scrollTop || document.body.scrollTop) +"px"; 
 }
} 
</script>
</head>
<body style="height:2000px;">
<h1>左右广告</h1>
<div id="adleft">左边广告</div>
<div id="adright">右边广告</div>
</body>
</html>

I hope this article will be helpful to everyone’s JavaScript programming design.

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