var Browser = (function(){          var na = window.navigator,               ua = na.userAgent.toLowerCase(),               browserTester = /(msie|webkit|gecko|presto|opera|safari|firefox|chrome|maxthon|android|ipad|iphone|webos|hpwos)[ \/os]*([\d_.]+)/ig,               Browser = {                    platform: na.platform               };          ua.replace(browserTester, function(a, b, c) {               var bLower = b.toLowerCase();               if (!Browser[bLower]) {                    Browser[bLower] = c;                }          });          if (Browser.opera) { //Opera9.8后版本号位置变化               ua.replace(/opera.*version\/([\d.]+)/, function(a, b) {                    Browser.opera = b;               });          }          if (Browser.msie) {               Browser.ie = Browser.msie;               var v = parseInt(Browser.msie, 10);               Browser[‘ie‘ + v] = true;          }          return Browser;     })();var getDocRect = function(doc){        doc = doc || document;        var win = doc.defaultView || doc.parentWindow,            mode = doc.compatMode,            root = doc.documentElement,            h = win.innerHeight || 0,            w = win.innerWidth || 0,            scrollX = win.pageXOffset || 0,            scrollY = win.pageYOffset || 0,            scrollW = root.scrollWidth,            scrollH = root.scrollHeight,            offsetW,offsetH;        if (mode != ‘CSS1Compat‘) { // Quirks            root = doc.body;            scrollW = root.scrollWidth;            scrollH = root.scrollHeight;        }        if (mode && !Browser.opera) { // IE, Gecko            w = root.clientWidth;            h = root.clientHeight;        }        scrollW = Math.max(scrollW, w);        scrollH = Math.max(scrollH, h);        scrollX = Math.max(scrollX, doc.documentElement.scrollLeft, doc.body.scrollLeft);        scrollY = Math.max(scrollY, doc.documentElement.scrollTop, doc.body.scrollTop);        offsetW =document.body.offsetWidth||document.documentElement.offsetWidth;        offsetH = document.body.offsetHeight||document.documentElement.offsetHeight;        return {            width: w,            height: h,            scrollWidth: scrollW,            scrollHeight: scrollH,            scrollX: scrollX,            scrollY: scrollY,            contentWidth:(scrollW == w ? offsetW:scrollW),            contentHeight:(scrollH == h ? offsetH:scrollH)        };        };