js生成缩略图
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title></title>
<script type="text/javascript" language="javascript">
var flag = false;
function DrawImage(ImgD) {
var image = new Image();
image.src = ImgD.src;
if (image.width > 0 && image.height > 0) {
flag = true;
if (image.width / image.height >= 164 / 112) {
if (image.width > 164) {
ImgD.width = 164;
ImgD.height = (image.height * 164) / image.width;
} else {
ImgD.width = image.width;
ImgD.height = image.height;
}
ImgD.alt = image.width + "×" + image.height;
}
else {
if (image.height > 35) {
ImgD.height = 35;
ImgD.width = (image.width * 35) / image.height;
} else {
ImgD.width = image.width;
ImgD.height = image.height;
}
ImgD.alt = image.width + "×" + image.height;
}
}
}
</script>
</head>
<body>
<input type="button" value="生成缩略图" onclick="DrawImage(this.nextSibling)" /><img src="img/0.jpg" border="0" width="164" height="112" >
</body>
</html>