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1121项目第四天

2024-08-22 09:04:20   222人阅读

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<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=http://www.mamicode.com/"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
    {
        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

 

1121项目第四天


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