//JS实现显示小图,图片按比例缩放
  var flag=false;
  function DrawImage(ImgD,iwidth,iheight){
  var image=new Image();
  //var iwidth = 105;     //定义允许图片宽度
  //var iheight = 150;     //定义允许图片高度
  image.src=ImgD.src;
  if(image.width>0 && image.height>0){
  flag=true;
  if(image.width/image.height>= iwidth/iheight){
  if(image.width>iwidth){    
  ImgD.width=iwidth;
  ImgD.height=(image.height*iwidth)/image.width;
  }else{
  ImgD.width=image.width;    
  ImgD.height=image.height;
  }
  ImgD.alt=image.width+"×"+image.height;
  }
  else{
  if(image.height>iheight){    
  ImgD.height=iheight;
  ImgD.width=(image.width*iheight)/image.height;
  }else{
  ImgD.width=image.width;    
  ImgD.height=image.height;
  }
  ImgD.alt=image.width+"×"+image.height;
  }
  }
  }  
  //调用：<img src="图片" onload="javascript:DrawImage(this)">//-->