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网页中图片大小自动调整三种方法

2008-07-12 20:46 519 查看
1.鼠标滚动图片大小调整

<body>
<script LANGUAGE="JAVASCRIPT">
function bbimg(o){
var zoom=parseInt(o.style.zoom, 10)||100;

zoom+=event.wheelDelta/12;

if (zoom>0)

o.style.zoom=zoom+'%';

return false;
}
</script>
<img src="123.jpg" onload="javascript:if(this.width>screen.width-screen.width/2) this.style.width=screen.width-screen.width/2" onmousewheel="return bbimg(this)" >
</body>

2.图片自动缩小到固定大小

<body onload="DrawImage(theimg)">
<script language="JavaScript">
<!--
//图片按比例缩放
var flag=false;
function DrawImage(ImgD){
var image=new Image();
var iwidth = 320; //定义允许图片宽度
var iheight = 180; //定义允许图片高度
image.src=ImgD.src;
if(image.width>0 && image.height>0){
flag=true;
if(image.width/image.height>= iwidth/iheight){
if(image.width>iwidth){
ImgD.width=iwidth;
ImgD.height=(image.height*iwidth)/image.width;
}else{
ImgD.width=image.width;
ImgD.height=image.height;
}
ImgD.alt=image.width+"×"+image.height;
}
else{
if(image.height>iheight){
ImgD.height=iheight;
ImgD.width=(image.width*iheight)/image.height;
}else{
ImgD.width=image.width;
ImgD.height=image.height;
}
ImgD.alt=image.width+"×"+image.height;
}
}
}
//-->
</script>
<img src="123.jpg" width="1024" height="768" name="theimg">
</body>

3.滚轮图片缩放的代码

<script language="javascript">
var count = 10;
function resizeimg(oImage)
{
count = Counting(count);
Resize(oImage,count);
return false;
}
function Counting(newzoom){
if (event.wheelDelta >= 120)
newzoom++;
else if (event.wheelDelta <= -120)
newzoom--;
if (newzoom<2) newzoom=2; ////只允许缩小到20%
if (newzoom>50) newzoom=50; ////只允许放大到500%
return newzoom;
}
function Resize(oImage,newzoom){
oImage.style.zoom = newzoom + '0%';
count=newzoom;
}
</script>

然后在<img src="">中加入
onDblClick="return Resize(this,10);return false;"
onmousewheel="return resizeimg(this)"
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