帮忙解释一下，谢谢大神

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帮忙解释一下，谢谢大神

<!DOCTYPE html>

<html>

<head>

<title>Js实现菜单弹性菜单</title>

body, ul, ol, dl, dt, dd, h1, h2, h3, h4, h5, p, form { padding: 0; margin: 0; }

li { list-style: none; }

img { border: 0; }

body { font-family: Arial; background: #fff url() repeat-x; }

#header { width: 960px; height: 107px; margin: 0 auto 12px; position: relative; }

#header h1 { padding-top: 15px; float: left; }

#header ul { height: 44px; position: absolute; right: 0; bottom: 0; }

#header .normal, #header .active { float: left; width: 88px; height: 44px; position: relative; z-index: 1; }

#header .normal a, #header .active a { float: left; width: 88px; height: 44px; line-height: 44px; text-align: center; text-decoration: none; font-size: 14px; font-weight: bold; }

#header .active a { color: #fff; }

#header .normal a { color: #999; }

#btn_bg { width: 83px; height: 42px; background: url(cloud.gif); position: absolute; overflow:hidden; left: 608px; bottom: 0; z-index: 2; }

#btn_bg ul { width: 528px; left:-176px; position:absolute; }

</style>

var away;

window.onload=function()

{

var odiv=document.getElementById("btn_bg");

var oul=odiv.getElementsByTagName("ul")[0];

var oli=document.getElementById("header").getElementsByTagName("ul")[0].getElementsByTagName("li");

var i=0;

for(i=0;i<oli.length;i++)

{

oli[i].index=i;

oli[i].onmouseover=function()

{

away=432+88*this.index;

menuInterval();

};

}

var timer=null;

function menuInterval()

{

if(timer)

{

clearInterval(timer);

}

timer=setInterval(menuMove, 30);

}

var step=0;

var l=0;

function menuMove()

{

var odiv=document.getElementById("btn_bg");

var oul=odiv.getElementsByTagName("ul")[0];

step+=(away-odiv.offsetLeft)/10;

step=step*0.78;

l=parseInt(odiv.offsetLeft+step);

odiv.style.left=l+"px";

oul.style.left=-l+432+"px";;

}

</script>

</head>

<body>

<ul>

</ul>

<ul>

</ul>

</div>

</body>

</html>

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1回答

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帮忙解释一下 ，谢谢大神

1回答

帮忙解释一下，谢谢大神