怎么把.图片等比缩放啊

[leo963258]

<td width=200 heihgt=300><img src='' id='pic'></td>

<script>
function img(src){
document.images.pic=src
}
</script>

请问怎么把一张图片等比缩放..不把表格撑开啊

[TSD]

<td width=200 ><img src='' id='pic'></td>

[ttyp]

<script language="JavaScript">
<!--
//图片按比例缩放
var flag=false;
function DrawImage(ImgD){
var image=new Image();
var iwidth = 80; //定义允许图片宽度
var iheight = 80; //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=".." onload = "DrawImage(this)">

[leo963258]

我有好多z张要在 pic这个id里显示,每张大小都不一样

[网事随逢]

mark...

[zmy0611]

function img(src)
{
var image=new Image();
image.src = src;
var w0 = image.width;
var h0 = image.height;
var w1 = 200;
var h1 = 300;
var r0 = w1/w0;
var r1 = h1/h0;

if(r0>r1) r0 = r1;
w0 = w0*r0;
h0 = h0*r0;

pic.style.width = w0;
pic.style.height = h0;
pic.src = src;
}