淡入淡出

来源：互联网发布：你的理想是什么知乎编辑：程序博客网时间：2024/04/30 14:34

淡入淡出：
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>淡入淡出（改变透明度）</title>
<style>
#div1{
width:100px;
height:200px;
left:0px;
top:150px;
background: red;
position:absolute;
opacity:0.3;
filter:alpha(opacity:30);
}
</style>
<script>
window.onload = function() {

var oDiv = document.getElementById('div1');

oDiv.onmouseover = function() {
startMove(100);
};
oDiv.onmouseout = function() {
startMove(30);
};

var timer = null;
var alpha=30;
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;
//第一个alpha,本身是字符串，需加单引号
oDiv.style.filter = 'alpha(opacity:'+alpha+')';
oDiv.style.opacity=alpha/100;
}
//不加else,最后点击按钮，也会运动（在运动和停止隔开，if/else）
}, 30);
};
};
//alert(oDiv.offsetLeft);
</script>
</head>
<body>
<div id="div1">
</div>
</body>
</html>

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