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)。
整个网页的源码如下:
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)。
- <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:
- <!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>