JS窗口大小监听

function adjust(obj){  
   var div = document.getElementById("pad");  
   var txt = document.getElementById("txt");  
   var w  = document.body.clientWidth;  
   var h  = document.body.clientHeight;  
   div.style.width = w/3;  
   div.style.height = h/3;  
   txt.style.width = w/6;  
   txt.style.height = h/6;  
}  
window.onload=function(){  
  window.onresize = adjust;  
  adjust();  
}