js is a method of implementing multiple gradients on the same page

2020-05-27 04:11:49
OfStack

This article illustrates how js can achieve multiple gradients on the same page. Share with you for your reference. The specific analysis is as follows:

Here can achieve 5 elements in any 1, mouse up transparency gradually increase, mouse out, transparency gradually reduce the effect.

Point 1:


var speed = 0;
if(target>obj.alpha){
speed = 5;
}else{
speed = -5;
}

Based on the comparison between the target value and the current value, the positive or negative velocity is determined.

Point 2:


for(i=0; i<runs_li.length; i++){
runs_li[i].timer = null;
runs_li[i].alpha = 30;
runs_li[i].onmouseover = function(){
startrun(this,100);
}
runs_li[i].onmouseout = function(){
startrun(this,30);
}
}

Each element is assigned its own transparency value, and its transparency changes are separated.

Finally, add the code:


<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title> Headless document </title>
<style>
body,ul,li{margin:0; padding:0;}
#runs{width:300px; margin:10px auto;}
#runs li{width:80px; height:80px; background:#06c; list-style:none;
float:left; margin:10px; display:inline;
filter:alpha(opacity=30); opacity:0.3;}
</style>
<script>
window.onload = function(){
 var runs = document.getElementById("runs");
 var runs_li = runs.getElementsByTagName("li");
 var i=0; 
 for(i=0; i<runs_li.length; i++){
 runs_li[i].timer = null;
 runs_li[i].alpha = 30;
 runs_li[i].onmouseover = function(){
  startrun(this,100);
 }
 runs_li[i].onmouseout = function(){
  startrun(this,30);
 }
 }
}
function startrun(obj,target){
 clearInterval(obj.timer);
 obj.timer = setInterval(function(){
 var speed = 0;
 if(target>obj.alpha){
  speed = 5;
 }else{
  speed = -5;
 }
 
 if(obj.alpha == target){
  clearInterval(obj.timer);
 }else{
  obj.alpha = obj.alpha + speed;
  obj.style.filter = "alpha(opacity="+obj.alpha+")";
  obj.style.opacity = obj.alpha/100;
 }
 
 },30)
}
</script>
</head>
<body>
<ul id="runs">
 <li>1</li>
 <li>2</li>
 <li>3</li>
 <li>4</li>
 <li>5</li>
</ul>
</body>
</html>

I hope this article is helpful for you to design javascript program.