js之可移植的查询窗口大小和位置

var Geometry = {};

if(window.screenLeft){ //IE and others

Geometry.getWindowX = function(){return window.screenLeft;};

Geometry.getWindowY = function(){return window.screenTop;};

}

else if{ //Firefox and others

Geometry.getWindowX = function(){return window.screenX;};

Geometry.getWindowY = function(){return window.screenY;};

}

if(windows.innerWidth){ //All browsers but IE

Geometry.getViewportWidth = function(){return windows.innerWidth;};

Geometry.getViewportHeight = function(){return windows.innerHeight ;};

Geometry.getHorizontalScroll = function(){return window.pageXOffset;};

Geometry.getVerticalScroll = function(){return window.pageYOffset;};

}

else if(document.documentElement && document.documentElement.clientWidth){

//These 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 without 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;};

}

//These functions return the size of the document.They are not window related,but they are 

//useful to have here anyway

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){

//适用于IE4,IE5,and IE6 without a DOCTYPE，以及chrome,firefox等其他浏览器

Geometry.getDocumentWidth = function(){return document.body.scrollWidth;};

Geometry.getDocumentHeight  = function(){return document.body.scrollHeight;};

}