FF不支持javascript的for in语句吗?
<!DOCTYPE   html   PUBLIC    "-//W3C//DTD   HTML   4.01   Transitional//EN "    "http://www.w3.org/TR/html4/loose.dtd ">  
  <html>  
  <head>  
  <meta   http-equiv= "Content-Type "   content= "text/html;   charset=GB18030 ">  
  <title> Insert   title   here </title>  
  </head>  
  <body>  
  <p   id= "test ">  </p>  
  <script   type= "text/javascript ">  
 for   (i   in   window){ 
    test.innerHTML   =   test.innerHTML+i+ " <br>  "; 
 } 
  </script>  
  </body>  
  </html>           
 上面在代码什么在P标签在FF中没有任何输出,而在IE和OPERA则有输出?          
------解决方案--------------------那是因为在FF下不能直接用ID来引用元素 
 用document.getElementById( "test ").innerHTML=