js method to achieve sharing and sliding effects as the page scrolls

js method to achieve sharing and sliding effects as the page scrolls_javascript skills

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Release： 2016-05-16 16:04:57

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The example in this article describes the method of using js to achieve the effect of sharing and sliding as the page scrolls. Share it with everyone for your reference. The details are as follows:

Scroll the page up and down, and the shared modules will slide along with it.

Key Points:

Copy code The code is as follows:

var scrtop =document.documentElement.scrollTop||document.body.scrollTop;

var height = document.documentElement.clientHeight||document.body.clientHeight;

var top = scrtop (height - jb51.offsetHeight)/2;

top = parseInt(top);

Get the vertical center position of the page

Above code:

<!DOCTYPE html>
<html>
<head>
<meta charset="gb2312" />
<title>无标题文档</title>
<style>
body{margin:0; padding:0; font:12px/1.5 arial; height:2000px;}
#jb51{width:100px; height:200px; line-height:200px;
text-align:center; border:1p solid #ccc;
background:#f5f5f5; position:absolute; left:-100px; top:0;}
#jb51_tit{position:absolute; right:-20px; top:60px;
width:20px; height:60px; padding:10px 0;
background:#06c; text-align:center;
line-height:18px; color:#fff;}
</style>
<script>
window.onload = function(){
 var jb51 = document.getElementById("jb51");
 jb51.onmouseover = function(){
 startrun(jb51,0,"left")
 }
 jb51.onmouseout = function(){
 startrun(jb51,-100,"left")
 }
 window.onscroll = window.onresize = function(){
 var scrtop=document.documentElement.scrollTop||document.body.scrollTop;
 var height=document.documentElement.clientHeight||document.body.clientHeight;
 var top = scrtop + (height - jb51.offsetHeight)/2;
 top = parseInt(top);
 startrun(jb51,top,"top")
 }
}
var timer = null
function startrun(obj,target,direction){
 clearInterval(timer);
 timer = setInterval(function(){
 var speed = 0;
 if(direction == "left"){
  speed = (target-obj.offsetLeft)/8;
  speed = speed>0&#63;Math.ceil(speed):Math.floor(speed);
  if(obj.offsetLeft == target){
  clearInterval(timer);
  }else{
  obj.style.left = obj.offsetLeft + speed + "px";
  }
 }
  if(direction == "top"){
  speed = (target-obj.offsetTop)/8;
  speed = speed>0&#63;Math.ceil(speed):Math.floor(speed);
  if(obj.offsetTop == target){
  clearInterval(timer);
  }else{
  obj.style.top = obj.offsetTop + speed + "px";
  }
  document.title = obj.offsetTop + ',' + target + ',' +speed;
 }
 },30)
}
</script>
</head>
<body>
<div id="jb51">
 分享到内容
 <span id="jb51_tit">分享到</span>
</div>
</body>
</html>

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