<!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>
<title></title>
<style type ="text/css" >
.class1
{ filter:gray;
}
</style>
<script type="text/javascript"
src="../Scripts/jquery-1.4.1.js"></script>
<script type
="text/javascript" >
$(function() {
$("#toggleBtn").click(function() {
$(document.body).toggleClass("class1");
});
});
</script>
</head>
<body>
<img src
="../image/00.jpg" alt ="" style =" width :35%; height :35%" />
<input
type ="button" value ="切换" id ="toggleBtn"
/>
</body>
</html>
原文：http://www.cnblogs.com/sumg/p/3742724.html