图片按比例缩放函数_JavaScript

以下是程序代码：

<script><BR><!--<BR>//图片按比例缩放<BR>var flag=false;<BR>function DrawImage(ImgD,iwidth,iheight){<BR> //参数(图片,允许的宽度,允许的高度)<BR> var image=new Image();<BR> image.src=ImgD.src;<BR> if(image.width>0 && image.height>0){<BR> flag=true;<BR> if(image.width/image.height>= iwidth/iheight){<BR> if(image.width>iwidth){ <BR> ImgD.width=iwidth;<BR> ImgD.height=(image.height*iwidth)/image.width;<BR> }else{<BR> ImgD.width=image.width; <BR> ImgD.height=image.height;<BR> }<BR> ImgD.alt=image.width+"×"+image.height;<BR> }<BR> else{<BR> if(image.height>iheight){ <BR> ImgD.height=iheight;<BR> ImgD.width=(image.width*iheight)/image.height; <BR> }else{<BR> ImgD.width=image.width; <BR> ImgD.height=image.height;<BR> }<BR> ImgD.alt=image.width+"×"+image.height;<BR> }<BR> }<BR>} <BR>//--><BR></script>
调用：