11.10document对象练习

时间：2021-02-04 06:36:51
<!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>

<style>

#cd1{ width:100px; height:175px; background-color:#900; color:#0F0; text-align:center; vertical-align:middle; line-height:35px; }

#cd2{ width:100px; height:175px; background-color:#900; color:#0F0; text-align:center; vertical-align:middle; line-height:35px; }

#cd3{ width:100px; height:175px; background-color:#900; color:#0F0; text-align:center; vertical-align:middle; line-height:35px; }

#a1{ width:100px; height:35px; background-color:#0F0; text-align:center; vertical-align:middle; line-height:34px; border:1px solid #000;}

#a2{ width:100px; height:35px; background-color:#0F0; text-align:center; vertical-align:middle; line-height:34px; border:1px solid #000;}

</style>

</head>

<body>

    <div style=" width:100px; height:35px;  color:#0F0; text-align:center; vertical-align:middle; line-height:35px;" onclick="xiala()">首页</div>

    <div id="cd1" style=" display:none">

    <div>企业介绍</div>

    <div>产品介绍</div>

    <div>产品中心</div>

    <div>服务中心</div>

    <div>联系我们</div>

    </div>

    <div style=" width:100px; height:35px;  color:#0F0; text-align:center; vertical-align:middle; line-height:35px;" onclick="xiala2()">企业介绍</div>

    <div id="cd2" style=" display:none">

    <div>产品介绍</div>

    <div>产品中心</div>

    <div>服务中心</div>

    <div>联系我们</div>

    </div>

    <div style=" width:100px; height:35px;  color:#0F0; text-align:center; vertical-align:middle; line-height:35px;" onclick="xiala3()">产品中心</div>

    <div id="cd3" style=" display:none">

    <div>产品介绍</div>

    <div>产品中心</div>

    <div>服务中心</div>

    <div>联系我们</div>

    </div>

<br />

<br />

<br />

<!--<div style="width:600px; height:35px; border:1px solid #000; text-align:center; vertical-align:middle; line-height:35px; color:#F00;">-->

    <div id="a1" style="overflow:hidden" onmouseover="chuxian()" onmouseout="yincang()">

    <div id="a2">产品介绍</div>

    <div id="a2">产品中心</div>

    <div id="a2">企业介绍</div>

    <div id="a2">联系我们</div>

    </div>

</div>

</body>

</html>

<script type="text/jscript">

function xiala(a)

{

    var a = document.getElementById("cd1");

    var str="none";

    if(str.indexOf(a.style.display)>=0)

    {

    a.style.display="block";

    }

    else(a.style.display="none")

}

function xiala2()

{

    var a = document.getElementById("cd2");

    var str="none";

    if(str.indexOf(a.style.display)>=0)

    {

    a.style.display="block";

    }

    else a.style.display="none";

}

function xiala3()

{

    var a = document.getElementById("cd3");

    var str="none";

    if(str.indexOf(a.style.display)>=0)

    {

    a.style.display="block";

    }

    else a.style.display="none";

}

function chuxian()

{

    var a = document.getElementById("a1");

    a.removeAttribute("style");

}

function yincang()

{

    var a = document.getElementById("a1");

    a.setAttribute("style","overflow:hidden");

}

</script>

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