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<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
</head>
<body>
<div id="a1" style="width:500px; height:500px; opacity:0;-moz-opacity:0.5;filter:alpha(opacity=50)" onclick="hua()"><img src="21a4462309f79052eea1b3080af3d7ca7bcbd54e.jpg"/></div>
</body>
</html>
<script type="text/jscript">
window.onscroll = function()
{
var d = document.getElementById("a1");
if(window.scrollY >= 100)
{
hua();
}
else{xs()}
}
function hua()
{
var zuo = document.getElementById("a1");
kd = zuo.style.opacity;
kd =parseFloat(kd)+0.01;
if(parseFloat(kd)>=1)
{
return;
}
else
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zuo.style.opacity = kd;
window.setTimeout("hua()",20)
}
}
function xs()
{
var zuo = document.getElementById("a1");
kd = zuo.style.opacity;
kd =parseFloat(kd)-0.01;
if(parseFloat(kd)<=0)
{
return;
}
else
{
zuo.style.opacity = kd;
window.setTimeout("xs()",20)
}
}
</script>
这是运用滚动监听实现的图片渐显渐隐的效果，滚轮滚动到下方图片显示，滚动回去图片隐藏，运用了函数
时间： 2024-09-30 09:21:59