JAVASCRIPT 获取屏幕高度宽度

var winWidth = 0;
var winHeight = 0;

function findDimensions() //函数：获取尺寸
    {
        //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;
        }
    }