1.html代码

复制代码 代码如下:

<div>

<div id="tab">

<h2>标题一</h2>

<h2>标题二</h2>

<h2>标题三</h2>

<h2>标题四</h2>

div>

<dl id="tabcon">

<dd>内容一</dd>

<dd>内容二</dd>

<dd>内容三</dd>

<dd>内容四</dd>

</dl>

<div>

2 .js部分

复制代码 代码如下:

<script type="text/javascript" defer="defer">

var tab = document.getElementById("tab").getElementsByTagName("h2");

function swap(n) {

return function() {

for(var i=0; i<tab.length; i++) {

document.getElementById("tabcon" + i).style.display = "none";

document.getElementById("tab" + i).className = "";

}

document.getElementById("tabcon" + n).style.display = "block";

document.getElementById("tab" + n).className = "focus";

}

}

for(var i=0; i<tab.length; i++) {

tab[i].setAttribute("id", "tab" + i);

if(window.addEventListener) {

tab[i].addEventListener("mouseover", swap(i), false);

} else if(window.attachEvent) {

tab[i].attachEvent("onmouseover", swap(i));

}

}

var tabcon = document.getElementById("tabcon").getElementsByTagName("dd");

for(i=0; i<tabcon.length; i++) {

tabcon[i].setAttribute("id", "tabcon" + i);

}

if(document.createEvent) {

var evObj = document.createEvent('MouseEvents');

evObj.initEvent( 'mouseover', true, false);

tab[0].dispatchEvent(evObj);

} else if( document.createEventObject) {

tab[0].fireEvent('onmouseover');

}

</script>