用css的zoom和js的addEventListener
var scrollFunc=function(e){var direct=0
e=e || window.event
div = document.getElementById('div')//最重要的
if(e.wheelDelta){//IE/Opera/Chrome
div.style.zoom = wheelDelta
}else if(e.detail){//Firefox
div.style.zoom = wheelDelta
}
ScrollText(direct)
}
/*注册事件*/
if(document.addEventListener){
document.addEventListener('DOMMouseScroll',scrollFunc,false)
}//W3C
window.onmousewheel=document.onmousewheel=scrollFunc//IE/Opera/Chrome/Safari
暂未测试
实现div层的放大与缩小，参考实例如下：<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
<style type="text/css">
.content
{
border: 1px solid #ccc
width: 440px
overflow: hidden
margin: 10px
}
</style>
<script type="text/javascript" src="jquery-1.4.2.min.js"></script>
<script type="text/javascript">
$(document).ready(function() {
if ($('#content').height() >400)
$('#content').height(400)
$('#bigger').toggle(function() {
$('#content').height($('#content').height() + 100)
$('#bigger').html('缩小')
}, function() {
$('#content').height($('#content').height() - 100)
$('#bigger').html('放大')
})
})
</script>
</head>
<body>
<div id="content" class="content">
内容1<br />
内容2<br />
</div>
<br />
<span id="bigger">放大</span>
</body>
</html>
