window.screen.availWidth 返回当前屏幕宽度(空白空间)
window.screen.availHeight 返回当前屏幕高度(空白空间) （1160像素，少了40像素？？？）
window.screen.width 返回当前屏幕宽度(分辨率值) $(window).width()为浏览器窗口的宽度
window.screen.height 返回当前屏幕高度(分辨率值)
window.document.body.offsetWidth; 返回当前网页宽度 （网页的宽度为1904，少了16像素????）
window.document.body.offsetHeight; 返回当前网页高度 （若网页中只有一个100像素高的div，此值就为100px）
1 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 2 <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en"> 3 <head> 4 <meta http-equiv="Content-Type" content="text/html;charset=UTF-8"> 5 <title>window.screen</title> 6 <script type="text/javascript" src='js/jquery.js'></script> 7 <script type="text/javascript"> 8 $(function(){ 9 console.log(window.screen.availWidth); //1920 10 console.log(window.screen.availHeight); //1160 11 console.log(window.screen.width); //1920 12 console.log(window.screen.height); //1200 13 console.log(window.document.body.offsetWidth); //1904 14 console.log(window.document.body.offsetHeight); //500 15 }) 16 </script> 17 </head> 18 <body> 19 <div style='100px; height:500px;'></div> 20 </body> 21 </html>