一、一个DIV设置淡入淡出
代码：
<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8">
<title>运动--淡入淡出</title>
<!-- <link href="test_css.css" rel="stylesheet" type="text/css">
<script type="text/javascript" src="test.js"></script>-->
<style>
#div {
200px;
height: 200px;
background: #ff2e1d;
position: absolute;
left: 100px;
top: 100px;
opacity: 0.3;
filter: alpha(opacity:30);
<!-- 仅支持IE浏览器 -->
}
</style>
<script>
window.onload = function () {
var oDiv = document.getElementById("div");
oDiv.onmouseover = function () {
startMove(100);
};
oDiv.onmouseout = function () {
startMove(30);
};
var alpha = 30;
var timer = null;
function startMove(iTarget) {
clearInterval(timer);
timer = setInterval(function () {
var speed = 0;
if (alpha < iTarget) {
speed = 10;
} else {
speed = -10;
}
if (alpha == iTarget) {
clearInterval(timer);
} else {
alpha += speed;
oDiv.style.filter = 'alpha(opacity:' + alpha + ')';
oDiv.style.opacity = alpha / 100;
}
}, 30);
}
}
</script>
</head>
<body>
<div id="div"></div>
</body>
</html>
运行结果：
初始：
鼠标移入：
鼠标移出：
二、多个DIV设置淡入淡出
代码：
<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8">
<title>无标题文档</title>
<style>
div {200px; height:200px; margin:20px; float:left; background:red; filter:alpha(opacity:30); opacity:0.3;}
</style>
<script>
window.onload=function ()
{
var aDiv=document.getElementsByClassName("e");
for(var i=0;i<aDiv.length;i++)
{
aDiv[i].alpha=30;
aDiv[i].onmouseover=function ()
{
startMove(this, 100);
};
aDiv[i].onmouseout=function ()
{
startMove(this, 30);
};
}
};
function startMove(obj, iTarget)
{
clearInterval(obj.timer);
obj.timer=setInterval(function (){
var speed=(iTarget-obj.alpha)/6;
speed=speed>0?Math.ceil(speed):Math.floor(speed);
if(obj.alpha==iTarget)
{
clearInterval(obj.timer);
}
else
{
obj.alpha+=speed;
obj.style.filter='alpha(opacity:'+obj.alpha+')';
obj.style.opacity=obj.alpha/100;
}
}, 30);
}
</script>
</head>
<body>
<div class="e"></div>
<div class="e"></div>
<div class="e"></div>
<div class="e"></div>
</body>
</html>