Home > Article > Web Front-end > js method to achieve multiple gradient effects on the same page_javascript skills

js method to achieve multiple gradient effects on the same page_javascript skills

WBOYOriginal: 2016-05-16 16:04:531134browse

The example in this article describes how to implement multiple gradient effects on the same page using js. Share it with everyone for your reference. The specific analysis is as follows:

Here you can achieve the effect of any one of the 5 elements. When the mouse is moved up, the transparency gradually increases, and when the mouse is moved out, the transparency gradually decreases.

Point 1:

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

Determine whether the speed is positive or negative based on the comparison between the target value and the current value.

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);
}
}

Add its own transparency value to each element, and separate its transparency changes.

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>无标题文档</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 will be helpful to everyone’s JavaScript programming design.

Statement：

The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Previous article：js method to achieve star rating effect_javascript skillsNext article：js method to achieve star rating effect_javascript skills

See more

js method to achieve multiple gradient effects on the same page_javascript skills

Related articles