var winWidth = 0;
var winHeight = 0;
function findDimensions()
{
//获取窗口宽度
if (window.innerWidth)
{
winWidth = window.innerWidth;
}
else if ((document.body) (document.body.clientWidth))
{
winWidth = document.body.clientWidth; //获取窗口高度
}
if (window.innerHeight)
{
winHeight = window.innerHeight;
}
else if ((document.body) (document.body.clientHeight))
{
winHeight = document.body.clientHeight;
}
//通过深入Document内部对body进行检测，获取窗口大小
if (document.documentElement document.documentElement.clientHeight document.documentElement.clientWidth)
{
winHeight = document.documentElement.clientHeight;
winWidth = document.documentElement.clientWidth;
}

var cssSize = document.styleSheets[0].rules||document.styleSheets[0].cssRules;
if(winWidth 1100)
{
cssSize[0].style.width = "1100px";
}
else
{
cssSize[0].style.width = "100%";
}

if(winHeight 600)
{
cssSize[0].style.height = "600px";
}
else
{
cssSize[0].style.height = "100%";
}
}

window.onresize=findDimensions;

function pageInit() {
//调用函数，获取数值
findDimensions();

}