javascript 获取窗口大小

var x = document.body.scrollLeft; 
var y = document.body.scrollTop;

//获取屏幕宽度
   availWidth = parseInt(window.screen.availWidth);
   availHeight = parseInt(window.screen.availHeight);

//获取可见区域 宽度 高度
   availWidth = parseInt(document.body.clientWidth);
   availHeight = parseInt(document.body.clientHeight);
        
可见区域高度:document.body.clientHeight
总高度:document.body.scrollHeight
可见区域宽度:document.body.clientWidth
总宽度:document.body.scrollWidth
var getWindowInfo=function(){var scrollX=0,scrollY=0,width=0,height=0,contentWidth=0,contentHeight=0;if(typeof(window.pageXOffset)=='number'){ scrollX=window.pageXOffset; scrollY=window.pageYOffset;}else if(document.body&&(document.body.scrollLeft||document.body.scrollTop)){ scrollX=document.body.scrollLeft; scrollY=document.body.scrollTop;}else if(document.documentElement&&(document.documentElement.scrollLeft||document.documentElement.scrollTop)){ scrollX=document.documentElement.scrollLeft; scrollY=document.documentElement.scrollTop;}if(typeof(window.innerWidth)=='number'){ width=window.innerWidth; height=window.innerHeight;}else if(document.documentElement&&(document.documentElement.clientWidth||document.documentElement.clientHeight)){ width=document.documentElement.clientWidth; height=document.documentElement.clientHeight;}else if(document.body&&(document.body.clientWidth||document.body.clientHeight)){ width=document.body.clientWidth; height=document.body.clientHeight;}if(document.documentElement&&(document.documentElement.scrollHeight||document.documentElement.offsetHeight)){ if(document.documentElement.scrollHeight>document.documentElement.offsetHeight){ contentWidth=document.documentElement.scrollWidth; contentHeight=document.documentElement.scrollHeight; } else { contentWidth=document.documentElement.offsetWidth; contentHeight=document.documentElement.offsetHeight; }}else if(document.body&&(document.body.scrollHeight||document.body.offsetHeight)){ if(document.body.scrollHeight>document.body.offsetHeight) { contentWidth=document.body.scrollWidth; contentHeight=document.body.scrollHeight; }else{ contentWidth=document.body.offsetWidth; contentHeight=document.body.offsetHeight; }}else{ contentWidth=width; contentHeight=height;} if(height>contentHeight) height=contentHeight; if(width>contentWidth) width=contentWidth; var rect=new Object(); rect.ScrollX=scrollX; rect.ScrollY=scrollY; rect.Width=width; rect.Height=height; rect.ContentWidth=contentWidth; rect.ContentHeight=contentHeight; return rect;}