JavaScript 图片缩放 响应鼠标滚动 和 下上方向键
日期：2014-05-16 浏览次数：20335 次
JavaScript 图片缩放 响应鼠标滚动 和 上下方向键
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>查看图片</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
<script language="JavaScript">
function zoomimg(img,upOrDown){
//img.style.zoom获取img对象的缩放比例，并转为十进制整数
var zoom = parseInt(img.style.zoom,10);
if (isNaN(zoom)){ //当zoom非数字时zoom默认为100％
zoom = 100;
}
//event.wheelDelta滚轮移动量上移＋120，下移－120或者按上下方向键，显示比例每次增减10％
if(event.wheelDelta != 0){
zoom += event.wheelDelta / 12;
}else if("up" == upOrDown){
zoom += 10;
}else if("down" == upOrDown){
zoom += -10;
}
//当zoom大于10％时重新设置显示比例
if (zoom>10) img.style.zoom = zoom + "%";
return false;
}
</script>
<style type="text/css">
.drag{position:relative;cursor:hand}
</style>
<script language="javascript">
//初始化页面图片
function init()
{
var url=location.href;
var num=url.indexOf("?")
var picUrl = url.substr(num+1);
document.getElementById("pic").src = picUrl;
listenKey();
}
//注册事件监听键盘上下方向键
function getKey(e){
e = e || window.event;
var keycode = e.which ? e.which : e.keyCode;
var pic = document.getElementById("pic");
if(keycode == 38){ //如果按的是上方向键
zoomimg(pic,"up");
}else if(keycode == 40){//如果按的是下方向键
zoomimg(pic,"down");
}
}
// 把keydown事件绑定到document中
function listenKey() {
if (document.addEventListener) { //FF
document.addEventListener("keydown",getKey,false);
} else if (document.attachEvent) { //IE
document.attachEvent("onkeydown",getKey);
} else {
document.onkeydown = getKey;
}
}
var dragapproved = false;
var z,x,y
function move()
{
if(event.button==1&&dragapproved)
{
z.style.pixelLeft=temp1+event.clientX-x
z.style.pixelTop = temp2+event.clientY-y
return false;
}
}
function drags()
{
if(!document.all)
return
if(event.srcElement.className=="drag")
{
dragapproved = true
z=event.srcElement;
temp1=z.style.pixelLeft
temp2=z.style.pixelTop
x=event.clientX
y=event.clientY
document.onmousemove=move
}
}
document.onmousedown=drags
document.onmouseup=new Function("dragapproved=false")
</scr
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>查看图片</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
<script language="JavaScript">
function zoomimg(img,upOrDown){
//img.style.zoom获取img对象的缩放比例，并转为十进制整数
var zoom = parseInt(img.style.zoom,10);
if (isNaN(zoom)){ //当zoom非数字时zoom默认为100％
zoom = 100;
}
//event.wheelDelta滚轮移动量上移＋120，下移－120或者按上下方向键，显示比例每次增减10％
if(event.wheelDelta != 0){
zoom += event.wheelDelta / 12;
}else if("up" == upOrDown){
zoom += 10;
}else if("down" == upOrDown){
zoom += -10;
}
//当zoom大于10％时重新设置显示比例
if (zoom>10) img.style.zoom = zoom + "%";
return false;
}
</script>
<style type="text/css">
.drag{position:relative;cursor:hand}
</style>
<script language="javascript">
//初始化页面图片
function init()
{
var url=location.href;
var num=url.indexOf("?")
var picUrl = url.substr(num+1);
document.getElementById("pic").src = picUrl;
listenKey();
}
//注册事件监听键盘上下方向键
function getKey(e){
e = e || window.event;
var keycode = e.which ? e.which : e.keyCode;
var pic = document.getElementById("pic");
if(keycode == 38){ //如果按的是上方向键
zoomimg(pic,"up");
}else if(keycode == 40){//如果按的是下方向键
zoomimg(pic,"down");
}
}
// 把keydown事件绑定到document中
function listenKey() {
if (document.addEventListener) { //FF
document.addEventListener("keydown",getKey,false);
} else if (document.attachEvent) { //IE
document.attachEvent("onkeydown",getKey);
} else {
document.onkeydown = getKey;
}
}
var dragapproved = false;
var z,x,y
function move()
{
if(event.button==1&&dragapproved)
{
z.style.pixelLeft=temp1+event.clientX-x
z.style.pixelTop = temp2+event.clientY-y
return false;
}
}
function drags()
{
if(!document.all)
return
if(event.srcElement.className=="drag")
{
dragapproved = true
z=event.srcElement;
temp1=z.style.pixelLeft
temp2=z.style.pixelTop
x=event.clientX
y=event.clientY
document.onmousemove=move
}
}
document.onmousedown=drags
document.onmouseup=new Function("dragapproved=false")
</scr
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