怎么把獲取的屏幕寬度和高度賦值給一個圖片上面
<a class="bg" href="wxdy.html"><img src="/skin/zt/wxdy/banner.gif" id="img"></a><script>
?var my=document.getElementById("img");
?var w=screen.width;
? var h=screen.height;
? document.write(w);
?my.style.width="document.write(w)+'px'";
? my.style.height="document.write(screen.height)";
//var w=document.write(screen.width);
//var h=document.write(screen.height);
? </script>
怎么值傳遞不對width和height那里，改怎么寫。
2017-02-21
var w=screen.width;
? var h=screen.height;
my.style.width=w+'px';
? my.style.height=h+'px';
2017-06-05
請問 ?my.style是啥？這里沒太看懂