js图片等比例缩放
js图片等比例缩放
/使用onload=resizeImage(this,长,宽);
function resizeImage(img,w,h)
{
var image=new Image();
image.src = img.src;
if(image.width > 0 && image.height > 0)
{
if(image.width / image.height >= w/h)
{
if(image.width > w)
{
img.width = w;
img.height = (image.height * w) / image.width;
}
else
{
img.width = image.width;
img.height = image.height;
}
//img.alt=image.width+"×"+image.height;
}
else
{
if(image.height > h)
{
img.height = h;
img.width = (image.width * h) / image.height;
}
else
{
img.width = image.width;
img.height = image.height;
}
}
}
}
补充：网页制作,js教程 
