js运动之"焦点图"
2018-01-17 本文已影响0人
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ed.jpg
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<style>
#div1 {
width: 200px;
height: 200px;
background:red;
/*兼容性问题，filter:alpha(opacity:30);给IE。opacity:0.3;给火狐谷歌用。*/
filter:alpha(opacity:30);
opacity:0.3;
}
</style>
<script>
window.onload=function(){
var oDiv=document.getElementById('div1');
oDiv.onmouseover=function(){
startMove(100);
};
oDiv.onmouseout=function(){
startMove(30);
};
};
var alpha=30;
var timer=null;
function startMove(iTarget){
var oDiv=document.getElementById('div1');
clearInterval(timer);
timer=setInterval(function(){
var speed=0;
if(alpha<iTarget){
speed=5;
}else{
speed=-5;
}
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>
