//ͼƬµÈ±ÈÀýËõ·Å
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;
            }
            }
      }
}