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利用javascript实现图片等比例缩放

2010-04-29 23:15 561 查看

下面方法可以实现等比例缩放：
1．把Image的Width和Height属性删除。
2.　把下面js代码复制在Image后面（注意：这里假设你的Image名称叫“Image1”如果不同请把它改过来，图片按等比例缩放成200×200）。

源代码复制(IE有效)打印关于
<script language="javascript" type="text/javascript"> function DrawImage() { var FitWidth = 200,FitHeight = 200; var ImgD = document.getElementById('Image1'); var image = new Image(); image.src=ImgD.src; if(image.width>0 && image.height>0) { if(image.width/image.height>= FitWidth/FitHeight) { if(image.width>FitWidth) { ImgD.width=FitWidth; ImgD.height=(image.height*FitWidth)/image.width; } else { ImgD.width=image.width; ImgD.height=image.height; } } else { if(image.height>FitHeight) { ImgD.height=FitHeight; ImgD.width=(image.width*FitHeight)/image.height; } else { ImgD.width=image.width; ImgD.height=image.height; } } } } DrawImage(); </script>

<script language="javascript" type="text/javascript">
function DrawImage()
{
var FitWidth = 200,FitHeight = 200;
var ImgD = document.getElementById('Image1');
var image = new Image();
image.src=ImgD.src;
if(image.width>0 && image.height>0)
{
if(image.width/image.height>= FitWidth/FitHeight)
{
if(image.width>FitWidth)
{
ImgD.width=FitWidth;
ImgD.height=(image.height*FitWidth)/image.width;
}
else
{
ImgD.width=image.width;
ImgD.height=image.height;
}
}
else
{
if(image.height>FitHeight)
{
ImgD.height=FitHeight;
ImgD.width=(image.width*FitHeight)/image.height;
}
else
{
ImgD.width=image.width;
ImgD.height=image.height;
}
}
}
}

DrawImage();
</script>

整个网页的源码如下：

源代码复制(IE有效)打印关于
<!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>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>图片等比例绽放</title>
</head>
<body>
<img src="Spring.jpg" id="Image1"/>
</body>
</html>
<script language="javascript" type="text/javascript">
function DrawImage()
{
var FitWidth = 200,FitHeight = 200;
var ImgD = document.getElementById('Image1');
var image = new Image();
image.src=ImgD.src;
if(image.width>0 && image.height>0)
{
if(image.width/image.height>= FitWidth/FitHeight)
{
if(image.width>FitWidth)
{
ImgD.width=FitWidth;
ImgD.height=(image.height*FitWidth)/image.width;
}
else
{
ImgD.width=image.width;
ImgD.height=image.height;
}
}
else
{
if(image.height>FitHeight)
{
ImgD.height=FitHeight;
ImgD.width=(image.width*FitHeight)/image.height;
}
else
{
ImgD.width=image.width;
ImgD.height=image.height;
}
}
}
}

DrawImage();
</script>

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