JS控制图片等比例缩放

<SCRIPT language="JavaScript"> function DrawImage(ImgD,FitWidth,FitHeight){ 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; } } } } </script>

 

调用方法：

 

<a href="admin/<? echo $rscase['path']?>" target="_blank"><img src="admin/<? echo $rscase['path']?>" alt="点击放大图片" width="180" height="180" onload='javascript:DrawImage(this,180,);' hspace="3" vspace="3" border="0" /></a>