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JavaScript 高级课程之缓冲收缩(多个DIV),谈入谈出

2016-06-08 14:20 357 查看

<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>JavaScript 高级课程之缓冲收缩(多个DIV),谈入谈出</title>
<style>
div { width:100px ; height:100px; margin-top:10px; background-color:#FF0004; filter:alpha(opacity:10); opacity:0.1;}
</style>
<script>
window.onload = function(){
var aDiv = document.getElementsByTagName('div');
for(var i=0; i<aDiv.length; i++){
aDiv[i].alpha = 10;   // 每个DIV设置透明度
aDiv[i].Timer = null; // 每个DIV设置定时器
aDiv[i].onmouseover = function(){
startMove(this,100);
}
aDiv[i].onmouseout = function(){
startMove(this,10);
}
}
}
function startMove(obj, iT){
clearInterval(obj.Timer);
obj.Timer = setInterval(function(){
var iSeppd =  (iT - obj.alpha)/8;
iSeppd = iSeppd>0?Math.ceil(iSeppd):Math.floor(iSeppd);
if(obj.alpha == iT){
clearInterval(obj.Timer);
}else{
obj.alpha += iSeppd;
obj.style.filter = 'alpha(opacity:'+obj.alpha+')';
obj.style.opacity = obj.alpha/100;
obj.innerHTML = obj.alpha;
}
},20)
}
</script>
</head>
<body>
<div></div>
<div></div>
<div></div>
<div></div>
</body>
</html>

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