<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>JS实现透明度渐变动画</title>
<style type="text/css">
*{margin:0;padding:0;}
#box{width:200px;height:200px;background-color:red;filter:alpha(opacity=30);opacity:0.3;}
</style>
<script type="text/javascript">
window.onload = function(){
var box = document.getElementById(‘box‘);
box.onmouseover = function(){
changeopa(100);
}
box.onmouseout = function(){
changeopa(30);
}
}
var timer;
var opa=30;
function changeopa(aim){
var box = document.getElementById(‘box‘);
clearInterval(timer);
timer=setInterval(function(){
if(opa==aim){
clearInterval(timer);
}else{
opa+=(aim-65)/3.5;
box.style.opacity=opa/100;
box.style.filter=‘alpha(opacity=‘+opa+‘)‘;
console.log(opa);
}
},30)
}
</script>
</head>
<body>
<div id="box"></div>
</body>
</html>
遇到的问题及注意事项：
1、浮点运算进行多次后会出现误差，尽量使用整数运算。
时间： 2024-11-10 13:07:37