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JS实现的选项卡切换

2016-01-02 09:49 666 查看

<!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>test</title>
<style>
*{margin:0;padding:0;}
body{font-size:14px;font-family:"Microsoft YaHei";}
ul,li{list-style:none;}
#tab{position:relative;}
#tab .tabList ul li{
float:left;
background:#fefefe;
background:-moz-linear-gradient(top, #fefefe, #ededed);
background:-o-linear-gradient(left top,left bottom, from(#fefefe), to(#ededed));
background:-webkit-gradient(linear,left top,left bottom, from(#fefefe), to(#ededed));
border:1px solid #ccc;
padding:5px 0;
width:100px;
text-align:center;
margin-left:-1px;
position:relative;
cursor:pointer;
}
#tab .tabCon{
position:absolute;
left:-1px;
top:32px;
border:1px solid #ccc;
border-top:none;
width:403px;
height:100px;
}
#tab .tabCon div{
padding:10px;
position:absolute;
opacity:0;
filter:alpha(opacity=0);
}
#tab .tabList li.cur{
border-bottom:none;
background:#fff;
}
#tab .tabCon div.cur{
opacity:1;
filter:alpha(opacity=100);
}
</style>
</head>
<body>
<div id="tab" style="margin-left:460px;margin-top:20px">
<div class="tabList">
<ul>
<li class="cur">菜单1</li>
<li>菜单2</li>
<li>菜单3</li>
<li>菜单4</li>
</ul>
</div>
<div class="tabCon">
<div class="cur">内容11111111111111111111111111</div>
<div>内容222222222222222222222222222</div>
<div>内容33333333333333333333333</div>
<div>内容4444444444444444444444444444</div>
</div>
</div>
<script>
window.onload = function() {
var oDiv = document.getElementById("tab");
var oLi = oDiv.getElementsByTagName("div")[0].getElementsByTagName("li");
var aCon = oDiv.getElementsByTagName("div")[1].getElementsByTagName("div");
var timer = null;
for (var i = 0; i < oLi.length; i++) {
oLi[i].index = i;
oLi[i].onmouseover = function() {
show(this.index);
}
}
function show(a) {
index = a;
var alpha = 0;
for (var j = 0; j < oLi.length; j++) {
oLi[j].className = "";
aCon[j].className = "";
aCon[j].style.opacity = 0;
aCon[j].style.filter = "alpha(opacity=0)";
}
oLi[index].className = "cur";
clearInterval(timer);
timer = setInterval(function() {
alpha += 2;
alpha > 100 && (alpha = 100);
aCon[index].style.opacity = alpha / 100;
aCon[index].style.filter = "alpha(opacity=" + alpha + ")";
alpha == 100 && clearInterval(timer);
},
5)
}
}
</script>
</body>
</html>

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