获取窗口 高 、宽 的JS代码

var getViewPortWidth = function()
{
    var width = 0;

    if ((document.documentElement) && (document.documentElement.clientWidth))
    {
        width = document.documentElement.clientWidth;
    }
    else if ((document.body) && (document.body.clientWidth))
    {
        width = document.body.clientWidth;
    }
    else if (window.innerWidth)
    {
        width = window.innerWidth;
    }

    return width;
};

var getViewPortHeight = function()
{
    var height = 0;

    if (window.innerHeight)
    {
        height = window.innerHeight - 18;
    }
    else if ((document.documentElement) && (document.documentElement.clientHeight))
    {
        height = document.documentElement.clientHeight;
    }

    return height;
};

var getContentHeight = function()
{
    if ((document.body) && (document.body.offsetHeight))
    {
        return document.body.offsetHeight;
    }

    return 0;
};

var getViewPortScrollX = function()
{
    var scrollX = 0;

    if ((document.documentElement) && (document.documentElement.scrollLeft))
    {
        scrollX = document.documentElement.scrollLeft;
    }
    else if ((document.body) && (document.body.scrollLeft))
    {
        scrollX = document.body.scrollLeft;
    }
    else if (window.pageXOffset)
    {
        scrollX = window.pageXOffset;
    }
    else if (window.scrollX)
    {
        scrollX = window.scrollX;
    }

    return scrollX;
};

var getViewPortScrollY = function()
{
    var scrollY = 0;

    if ((document.documentElement) && (document.documentElement.scrollTop))
    {
        scrollY = document.documentElement.scrollTop;
    }
    else if ((document.body) && (document.body.scrollTop))
    {
        scrollY = document.body.scrollTop;
    }
    else if (window.pageYOffset)
    {
        scrollY = window.pageYOffset;
    }
    else if (window.scrollY)
    {
        scrollY = window.scrollY;
    }

    return scrollY;
};