獲取當前視窗的高度

var winHeight = 0;
	if(window.innerHeight) winHeight = window.innerHeight;
	else if((document.body) && (document.body.clientHeight)) winHeight = document.body.clientHeight;
	//通過深入Document內部對body進行檢測，獲取瀏覽器視窗高度
	if(document.documentElement && document.documentElement.clientHeight)
           winHeight = document.documentElement.clientHeight;
 

隨螢幕尺寸變化執行函式（fullScreen方法名）

window.onresize = fullScreen;