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[学习笔记]JavaScript基础--淡入淡出

2015-08-08 15:04 671 查看

<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title></title>
<meta charset="utf-8" />
<style>
#div1 {
width: 200px;
height: 200px;
background: blue;
filter:alpha(opacity:30);
opacity:0.3;
}

</style>
<script>
var alpha = 30;
var timer = null;
window.onload = function () {
var oDiv = document.getElementById('div1');
oDiv.onmouseover=function()
{
startMove(100);
};
oDiv.onmouseout = function () {
startMove(30);
};

};
var timer=null;
function startMove(iTarget)
{
var oDiv=document.getElementById('div1');
clearInterval(timer);
timer = setInterval(function () {
var speed = 0;
if (alpha < iTarget) {
speed = 1;
}
else {
speed = -1;
}
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="div1">

</div>
</body>
</html>

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