js获取窗口的高度

<script language="javascript">
     function getHeight()
         {
            var yScroll;
            if (window.innerHeight && window.scrollMaxY) {
                yScroll = window.innerHeight + window.scrollMaxY;
            }
            else if (document.body.scrollHeight > document.body.offsetHeight) {
                yScroll = document.body.scrollHeight; // all but Explorer Mac 
            }
            else {
                yScroll = document.body.offsetHeight;  // Explorer Mac...would also work in Explorer 6 Strict, Mozilla and Safari   
            }
            var windowHeight;
            if (self.innerHeight) {
                windowHeight = self.innerHeight; // all except Explorer       
            }
            else if (document.documentElement && document.documentElement.clientHeight) {
                windowHeight = document.documentElement.clientHeight; // Explorer 6 Strict Mode         
            }
            else if (document.body) {
                windowHeight = document.body.clientHeight; // other Explorers           
            }
            if (yScroll < windowHeight) {
                pageHeight = windowHeight; // for small pages with total height less then height of the viewport       
            }
            else {
                pageHeight = yScroll;
            }
            return pageHeight;
        }
        function getWidth() {
            var xScroll
            if (window.innerHeight && window.scrollMaxY) {
                xScroll = document.body.scrollWidth;
            }
            else if (document.body.scrollHeight > document.body.offsetHeight) {
                xScroll = document.body.scrollWidth;    // all but Explorer Mac      
            }
            else {
                xScroll = document.body.offsetWidth;
            }
            var windowWidth
            if (self.innerHeight) {
                windowWidth = self.innerWidth; // all except Explorer   
            }
            else if (document.documentElement && document.documentElement.clientHeight) {
                windowWidth = document.documentElement.clientWidth; // Explorer 6 Strict Mode         
            }
            else if (document.body) {
                windowWidth = document.body.clientWidth;      // other Explorers
            }
            if (xScroll < windowWidth) {
                pageWidth = windowWidth;
            }
            else {
                pageWidth = xScroll;
            }
            return pageWidth;
        }

        function dd() {
            document.getElementById("mid-height").style.height = getHeight()-104-32;
        }
        setInterval("dd()", 50);
	

</script>


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