JavaScript获得页面区域大小的代码

原文地址：http://andrewdupont.net/2006/09/09/viewport-dimensions-in-javascript/

一个JavaScript获得页面区域大小的代码，兼容性很好！

 var Client = { 
      viewportWidth: function() { 
        return self.innerWidth || (document.documentElement.clientWidth || document.body.clientWidth); 
      }, 
   
      viewportHeight: function() { 
        return self.innerHeight || (document.documentElement.clientHeight || document.body.clientHeight); 
      }, 
   
      viewportSize: function() { 
        return {  this.viewportWidth(), height: this.viewportHeight() }; 
      } 
     };