Some js Demo

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1.定时器实现美女图定时变化；
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title> New Document </title>
<meta charset="utf-8"/>
<script type="text/javascript">
var i=1;
function img(){

var ima=document.getElementById("imgMM");
ima.src="images/"+i+".jpg";

i++;
if(i>4){i=1;}
}
var timer=null;
timer=setInterval(img,1000);
document.getElementById("imgMM").onclick=function(){
clearInterval(timer);
}
</script>
</head>

<body>
<image id="imgMM" src=""/>

</body>
</html>

2.点击按钮实现div显示和隐藏
<!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 type="text/css">
div{
width:500px;
height:200px;
margin-bottom:10px;
border:1px solid #003;
}
</style>
<script type="text/javascript" src="js/jquery-2.1.0.min.js"></script>
<script type="text/javascript">
//使用jquery的方法
$(function(){
$("button").click(function(){
$("#down").slideToggle();
})
})
//传统的js方法
/* window.onload=function(){
var btn=document.getElementById("btn");
var div=document.getElementById("down");
btn.onclick=function(){
if(div.style.display=="none"){div.style.display="block";}
else if(div.style.display=="block"){div.style.display="none";}
}
}*/
</script>
</head>

<body>

<div id="up">
<button id="btn">显示、隐藏下面的div</button>
</div>
<div id="down" style="display:none;"></div>
</body>
</html>

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