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<script language="javascript">
function init()
{
RsizeAllImageById("imgProductItem", 150, 150);
}
//將頁面內所有指定id的圖片按比例縮放
function RsizeAllImageById(id, W, H)
{
var imgs = document.getElementsByTagName("img");
for(var i=0; i<imgs.length; i++)
{
if(imgs[i].id == id)
{
ResizeImage(imgs[i], W, H);
}
}
}
function ResizeImage(imageDest, W, H)
{
//顯示框寬度W,高度H
var image = new Image();
image.src = imageDest.src;
if(image.width>0 && image.height>0)
{
//比較縱橫比
if(image.width/image.height >= W/H)//相對顯示框：寬>高
{
if(image.width > W) //寬度大於顯示框寬度W，應壓縮高度
{
imageDest.width = W;
imageDest.height = (image.height*W)/image.width;
}
else //寬度少於或等於顯示框寬度W，圖片完全顯示
{
imageDest.width = image.width;
imageDest.height = image.height;
}
}
else//同理
{
if(image.height > H)
{
imageDest.height = H;
imageDest.width = (image.width*H)/image.height;
}
else
{
imageDest.width = image.width;
imageDest.height = image.height;
}
}
}
}
</script>
調用<BODY onload="javascript:init();">
<img style="cursor:pointer" height="150" width="150" id="imgProductItem" name="imgProductItem">
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