js获取各种宽度和高度
js获取网页屏幕可见区域高度
http://qiaolevip.iteye.com/blog/2076034
JS中offsetTop、clientTop、scrollTop、offsetTop各属性介绍
http://www.cnblogs.com/laogao/archive/2012/07/14/2591179.html
screenY 事件属性
http://www.w3school.com.cn/jsref/event_screeny.asp
3、clientX, clientY,offsetX, offsetY,screenX, screenY, x, y
http://www.cnblogs.com/mingforyou/p/4105600.html
JS,Jquery获取各种屏幕的宽度和高度
http://www.cnblogs.com/xiaopin/archive/2012/03/26/2418152.html
document.documentElement和document.body区别介绍
http://www.jb51.net/article/41410.htm
document.body.clientHeight 和 document.documentElement.clientHeight 的区别
http://www.cnblogs.com/luluping/archive/2010/07/16/1778766.html