浏览器获取宽高

• screen.availHeight is the height the browser's window can have if it is maximized. (including all the window decoration of the browser like the status bar, menu bars and title bar)
• $(window).height() is the height of the viewport that shows the website. (excluding your toolbars and status bar and stuff like this)
• $(document).height() is the height of your document shown in the viewport. If it is higher than $(window).height() you get the scrollbars to scroll the document.

网页可见区域宽：document.body.clientWidth
网页可见区域高：document.body.clientHeight (html下获取浏览器高度，xhtml下获取元素总高度)
网页可见区域高：document.documentElement.clientHeight (xhtml下获取浏览器高度)
网页可见区域宽：document.body.offsetWidth (包括边线的宽)
网页可见区域高：document.body.offsetHeight (包括边线的宽)
网页正文全文宽：document.body.scrollWidth
网页正文全文高：document.body.scrollHeight
网页被卷去的高：document.body.scrollTop
网页被卷去的左：document.body.scrollLeft
网页正文部分上：window.screenTop
网页正文部分左：window.screenLeft
屏幕分辨率的高：window.screen.height
屏幕分辨率的宽：window.screen.width
屏幕可用工作区高度：window.screen.availHeight
屏幕可用工作区宽度：window.screen.availWidth