一、不使用jquery，简单的缩放：
复制代码 代码如下:
<HTML>
<HEAD>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<TITLE>onMouseWheel</TITLE>
<SCRIPT>
var count = 10;
function Picture()
{
count = Counting(count);
Resize(count);
return false;
}
function Counting(count){
if (event.wheelDelta >= 120)
count++;
else if (event.wheelDelta <= -120)
count--;
return count;
}
function Resize(count){
oImage.style.zoom = count + '0%';
oCounter.innerText = count + '0%';
}
</SCRIPT>
</HEAD>
<BODY>
<div align=center>
<span>Size =
<span>100%</span></span>
<img src="https://www.jb51.net/images/aaa.gif" onmousewheel="return Picture();" >
</div>
</BODY>
</HTML>
一、使用jquery，实现缩放和拖动：
复制代码 代码如下:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title></title>
<style type="text/css">
#imgBox
{
width: 200px;
height: 200px;
background: red;
overflow: hidden;
margin: auto;
position: relative;
}
#imgMain
{
position: relative;
top: -200px;
}
</style>
<script src="https://www.jb51.net/js/jquery-1.2.6.js" type="text/javascript"></script>
<script type="text/javascript" language="javascript">
$(function () {
var event;
if ($.browser.mozilla) {
event = "DOMMouseScroll";
}
else {
event = "mousewheel";
}
$("#divBlock").bind(event,
function (e) {
var evt = window.event || e;
var newWidth;
var newHeight;
var newLeft;
var newTop;
var overHeight = $("#divBlock").height();
if (evt.detail > 0 || evt.wheelDelta < 0) {
newWidth = $("#imgMain").width() - 20;
newHeight = $("#imgMain").height() - 20;
newLeft = $("#imgMain").position().left + 10;
newTop = $("#imgMain").position().top + 10 - overHeight;
}
else {
newWidth = $("#imgMain").width() + 20;
newHeight = $("#imgMain").height() + 20;
newLeft = $("#imgMain").position().left - 10;
newTop = $("#imgMain").position().top - 10 - overHeight;
}
$("#imgMain").css({ left: newLeft + "px", top: newTop + "px" });