图片(img标签)大小自适应

 

$(function(){
             var myimg,oldwidth,oldheight;
               var maxwidth=249;
               var maxheight=187;
               var imgs = document.getElementsByTagName('img'); 
             
               for(i=0;i<imgs.length;i++){
                 myimg = imgs[i];
             
                 if(myimg.width > myimg.height)
                 {
                     if(myimg.width > maxwidth)
                     {
                        oldwidth = myimg.width;
                        myimg.height = myimg.height * (maxwidth/oldwidth);
                        myimg.width = maxwidth;
                     }
                 }else{
                     if(myimg.height > maxheight)
                     {
                        oldheight = myimg.height;
                        myimg.width = myimg.width * (maxheight/oldheight);
                        myimg.height = maxheight;
                     }
                 }
               }
        })