获取窗口 高 、宽 的JS代码

vargetViewPortWidth =function()
{
varwidth = 0;

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

returnwidth;
};

vargetViewPortHeight =function()
{
varheight = 0;

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

returnheight;
};

vargetContentHeight =function()
{
if((document.body) && (document.body.offsetHeight))
{
returndocument.body.offsetHeight;
}

return0;
};

vargetViewPortScrollX =function()
{
varscrollX = 0;

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

returnscrollX;
};

vargetViewPortScrollY =function()
{
varscrollY = 0;

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

returnscrollY;
};