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        function getIeCompatMode() {
            var engine = null;
            if (window.navigator.appName == “Microsoft Internet Explorer”) {
                if (document.documentMode) {
                    engine = document.documentMode;
                } else {
                    engine = 5;
                    if (document.compatMode) {
                        if (document.compatMode == “CSS1Compat”) {
                            engine = 7;
                        }
                    }
                }
            }
        }

结果是 5, 7, 8, 9 ，IE6的结果是7（这段代码是获取浏览器兼容性模式的，非判断浏览器）