如何让button位于窗口的底部?
?
------解决方案-------------------- <html>  
  <body>  
  <button style= "position:relative; "id= "btn1 "> 最底部 </button>  
  </body>  
  <script>  
 document.getElementById( "btn1 ").style.top=document.body.clientHeight-2*document.getElementById( "btn1 ").offsetHeight; 
  </script>  
  </html>