为什么总获得不到浏览器高度?总是0
var   w=window.document.body.offsertWidth; 
 宽能获得。 
 var   h   =   window.document.body.offsertHeight; 
 h   次次是   0怎么回事》》   
 代码: 
  <!DOCTYPE   html   PUBLIC    "-//W3C//DTD   XHTML   1.0   Transitional//EN "    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd ">  
  <html   xmlns= "http://www.w3.org/1999/xhtml ">  
  <head>  
  <meta   http-equiv= "Content-Type "   content= "text/html;   charset=gb2312 "   />  
  <title> 无标题文档 </title>  
  <script   language= "javascript ">  
 	function   pp() 
 	{ 
 		var   w=window.document.body.offsertWidth; 
 		var   h=window.document.body.offsertHeight; 
 		alert(h); 
 		var   z=10; 
 		var   x=parseInt(document.getElementById( "l1 ").style.left); 
 		var   y=parseInt(document.getElementById( "l1 ").style.top); 
 		document.getElementById( "l1 ").style.left=x+3; 
 		document.getElementById( "l1 ").style.top=y+z;  		 
 		setTimeout( "pp() ",200); 
 	} 
  </script>  
  <style   type= "text/css ">  
  <!-- 
 body   { 
 	background-color:   #FF9900; 
 } 
 #l1   { 
 	position:absolute; 
 	left:51px; 
 	top:19px; 
 	width:320px; 
 	height:201px; 
 	z-index:1; 
 } 
 -->  
  </style>  </head>    
  <body   onload= "pp() ">  
  <div   id= "l1 "   style= "left:0px;top:0px ">  <img   src= "矛.gif "   width= "323 "   height= "242 "   />  </div>  
  </body>  
  </html>  
------解决方案--------------------解释参见 
 http://blog.csdn.net/net_lover/archive/2006/08/25/1116488.aspx
------解决方案--------------------不同的写法是因果 
  <!DOCTYPE html PUBLIC  "-//W3C//DTD XHTML 1.0 Transitional//EN "  "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd ">    
 规范的不同造成的