【】js 获取windown窗体属性

if(!coos)var coos = function(){};
if(!coos.browser)
{
 coos.userAgent = navigator.userAgent.toLowerCase();
 coos.browser = {
  version: (coos.userAgent.match( /.+(?:rv|it|ra|ie)[\/: ]([\d.]+)/ ) || [0,'0'])[1],
  safari: /webkit/.test(coos.userAgent),
  opera: /opera/.test(coos.userAgent),
  msie: /msie/.test(coos.userAgent) && !/opera/.test(coos.userAgent),
  mozilla: /mozilla/.test(coos.userAgent) && !/(compatible|webkit)/.test(coos.userAgent)
 };
}
coos.window = function(){};
coos.window.winWidth  = 0;
coos.window.winHeight = 0;

/**
 * 获取屏幕宽度的函数，在非xhtml标准页面下有可能有问题
 */
coos.window.width = function()
{
 if (window.innerWidth)//for Firefox
 {
  coos.window.winWidth = window.innerWidth;
 }
 else if((document.body) && (document.body.clientWidth))
 {
  coos.window.winWidth = document.body.clientWidth;
 }

 if (document.documentElement && document.documentElement.clientWidth)
 {
  coos.window.winWidth = document.documentElement.clientWidth;
 }
 return coos.window.winWidth;
};

/**
 * 获取屏幕高度的函数
 * html,body高度属性必须设值为height:100%否则在火狐浏览器下获取不到真实高度
 */
coos.window.height = function()
{
 if (window.innerHeight)//for Firefox
 {
  coos.window.winHeight = window.innerHeight;
 }
 else if((document.body) && (document.body.clientHeight))
 {
  coos.window.winHeight = document.body.clientHeight;
 }

 if (document.documentElement  && document.documentElement.clientHeight)
 {
  coos.window.winHeight = document.documentElement.clientHeight;
 }
 return coos.window.winHeight;
};

/**
 * 获取滚动条横向宽度
 */
coos.window.scrollWidth = function()
{
 return document.body.scrollWidth + "px";
};

/**
 * 获取滚动条竖向高度，取body.scrollHeight和documentElement.scrollHeight中最高的一个
 */
coos.window.scrollHeight = function()
{
 return Math.max(document.body.scrollHeight,document.documentElement.scrollHeight) + "px";
};

coos.window.onscroll = function(){};

/**
 * window.onscroll绑定事件
 * @param fn 需要绑定的function
 */
coos.window.onscroll.add = function(fn)
{
 if (window.addEventListener)
 {
  window.addEventListener("scroll",fn,false);
 }
 else
 {
  window.attachEvent("onscroll", fn);
 }
};

/**
 * 删除window.onscroll绑定事件
 * @param fn 需要绑定的function
 */
coos.window.onscroll.remove = function(fn)
{
 if (window.removeEventListener)
 {
  window.addEventListener("scroll",fn,false);
 }
 else
 {
  window.detachEvent("onscroll", fn);
 }
};

/**
 * window.onload绑定事件
 * @param fn 需要绑定的function
 */
coos.window.onload = function(fn)
{
 if (window.addEventListener)
 {
  window.addEventListener("load",fn,false);
 }
 else
 {
  window.attachEvent("onload", fn);
 }
};

/**
 * 让元素显示在屏幕中间,元素必须是绝对定位的
 * @param obj 要显示的对象,改变top left 属性值
 * @param event 触发的事件，在有滚动条的情况下必须传入事件以获取当时所在的滚动条高度
 * @example
<style type="text/css">
  html,body {margin: 0; padding: 0;height:100%;font-size: 14px;}
   </style>
    <script type="text/javascript"> 
 function show(event)
 {
  var obj = document.getElementById("showDiv");
  coos.window.center(obj,event);
  //元素在屏幕中间距离顶部的高度
  var top = coos.window.center.top(obj);
  //固顶在屏幕上,不随滚动条变化
  coos.window.fixed.set(obj,top);
  coos.window.fixed();
 }
    </script>
 <div id="showDiv" style="position:absolute;left:20px;top:5px;height:20px;width:400px;border:2px solid #ccc;text-align: center;clear: both;">
  I'm a div,I can show and fixed in center!
 </div>
 <div style="clear: both;margin:80px;height:1000px;">
  <br /><br />
  <a href="javascript:void(0)" onclick="show(event)">show div center</a>
 </div>
 */
coos.window.center = function(obj,event)
{
 var e = event || window.event;
 if(e)
 {
  obj.style.left = ((coos.window.width() - parseInt(obj.style.width,10))/2).toFixed() + "px";
  var objh = (parseInt(obj.style.height,10)/2).toFixed();
  var sh = parseInt(Math.max(document.body.scrollTop,document.documentElement.scrollTop),10);
  var wh = parseInt((coos.window.height()/2).toFixed(),10);
  var ch = sh + wh;
  obj.style.top  = (ch - objh) + "px";
 }
 else
 {
  obj.style.left = ((coos.window.width() - parseInt(obj.style.width,10))/2).toFixed() + "px";
  obj.style.top  = ((coos.window.height() - parseInt(obj.style.height,10))/2).toFixed() + "px";
 }
};

/**
 * 获取屏幕中间显示距离顶部的高度
 */
coos.window.center.top = function(obj)
{
 return ((coos.window.height() - parseInt(obj.style.height,10))/2).toFixed();
};

/**
 * 固顶元素在屏幕中显示，不随滚动条的变化而变化
 */
coos.window.fixed = function()
{
 coos.window.onscroll.add(coos.window.fixed.bind);
};

/**
 * 绑定需要固顶高度的元素window.onscroll事件
 */
coos.window.fixed.bind = function()
{
 if(!coos.window.fixed.obj || !coos.window.fixed.top)
 {
  return;
 }
 var objs = coos.window.fixed.obj;
 var tops = coos.window.fixed.top;
 var len = objs.length;
 //ie6.0以下不支持position:fixed;属性
 if(coos.browser.msie && parseInt(coos.browser.version) <= 6)
 {
  for(var i = 0; i < len;i++)
  {
   var sh = parseInt(Math.max(document.body.scrollTop,document.documentElement.scrollTop),10);
   objs[i].style.top = (sh + tops[i]) + "px";
  }
 }
 else
 {
  for(var i = 0; i < len;i++)
  {
   objs[i].style.position = "fixed";
   objs[i].style.top = tops[i] + "px";
  }
  //设置完position:fixed;属性和top属性后移除onscroll事件
  coos.window.onscroll.remove(coos.window.fixed.bind);
 }
};

/**
 * 设置需要固定高度的元素
 * @param obj 需要固定高度的元素对象
 * @param top 需要固定高度的元素距离顶部的高度
 */
coos.window.fixed.set = function(obj,top)
{
 if(!coos.window.fixed.obj)
 {
  coos.window.fixed.obj = new Array();
 }
 coos.window.fixed.obj.push(obj);
 
 if(!coos.window.fixed.top)
 {
  coos.window.fixed.top = new Array();
 }
 top = parseInt(top,10);
 coos.window.fixed.top.push(top);
};

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 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> 
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> 
<head> 
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> 
    <title>coos.extend.window Build Test Page</title> 
 <script type="text/javascript" src="coos.extend.window.js"></script>
</head> 
    <body>
 <style type="text/css">
  html,body {margin: 0; padding: 0;height:100%;font-size: 14px;}
   </style>
    <script type="text/javascript"> 
 function show(event)
 {
  var obj = document.getElementById("showDiv");
  coos.window.center(obj,event);
  //元素在屏幕中间距离顶部的高度
  var top = coos.window.center.top(obj);
  //固顶在屏幕上,不随滚动条变化
  coos.window.fixed.set(obj,top);
  coos.window.fixed();
 }
    </script>
 <div id="showDiv" style="position:absolute;left:20px;top:5px;height:20px;width:400px;border:2px solid #ccc;text-align: center;clear: both;">
  I'm a div,I can show and fixed in center!
 </div>
 <div style="clear: both;margin:80px;height:1000px;">
  <br /><br />
  <a href="javascript:void(0)" onclick="show(event)">show div center</a>
 </div>
</body> 
</html>