JavaScript 可移植地查询窗口几何属性

    <script type="text/javascript">
     var Geometry={};
     
     if(window.screenLeft){ //IE and others
      Geometry.getWindowX=function(){return window.screenLift;};
      Geometry.getWindowY=function(){return window.screenTop; };
     }else if(window.screenX){ //Firefox and others
      Geometry.getWindowX=function(){return window.screenX; };
      Geometry.getWindowY=function(){return window.screenY; };
     }
     
     if(window.innerWidth){ //All browsers but IE
      Geometry.getViewportWidth=function(){return window.innerWidth; };
      Geometry.getViewportHeight=function(){return window.innerHeight; };
      Geometry.getHorizontalScroll=function(){return window.pageXOffset; };
      Geometry.getVerticalScroll=function(){return window.pageYOffset; };
     }else if(document.documentElement && document.documentElement.clientWidth){ //There functions are for IE6 when there is a DOCTYPE
      Geometry.getViewportWidth=function(){return document.documentElement.clientWidth; };
      Geometry.getViewportHeight=function(){return document.documentElement.clientHeight; };
      Geometry.getHorizontalScroll=function(){return document.documentElement.scrollLeft; };
      Geometry.getVerticalScroll=function(){return document.documentElement.scrollTop; };
     }else if(document.body.clientWidth){ //These are for IE4,IE5,and IE6 wihtout a DOCTYPE
      Geometry.getViewportWidth=function(){return document.body.clientWidth; };
      Geometry.getViewportHeight=function(){return document.body.clientHeight; };
      Geometry.getHorizontalScroll=function(){return document.body.scrollLeft; };
      Geometry.getVerticalScroll=function(){return document.body.scrollTop; };
     }
     
     if(document.documentElement && document.documentElement.scrollWidth){
      Geometry.getDocumentWidth=function(){return document.documentElement.scrollWidth; };
      Geometry.getDocumentHeight=function(){return document.documentElement.scrollHeight; };
     }else if(document.body.scrollWidth){
      Geometry.getDocumentWidth=function(){return document.body.scrollWidth; };
      Geometry.getDocumentHeight=function(){return document.body.scrollHeight; };
     }
    </script>