代码在ext里的srccoreext.js下

最新的ext3.0beat1的代码如下：

复制代码 代码如下:

ua = navigator.userAgent.toLowerCase(),

check = function(r){

return r.test(ua);

},

isStrict = document.compatMode == "CSS1Compat",

isOpera = check(/opera/),

isChrome = check(/chrome/),

isWebKit = check(/webkit/),

isSafari = !isChrome && check(/safari/),

isSafari3 = isSafari && check(/version/3/),

isSafari4 = isSafari && check(/version/4/),

isIE = !isOpera && check(/msie/),

isIE7 = isIE && check(/msie 7/),

isIE8 = isIE && check(/msie 8/),

isGecko = !isWebKit && check(/gecko/),

isGecko3 = isGecko && check(/rv:1.9/),

isBorderBox = isIE && !isStrict,

isWindows = check(/windows|win32/),

isMac = check(/macintosh|mac os x/),

isAir = check(/adobeair/),

isLinux = check(/linux/),

isSecure = /^https/i.test(window.location.protocol);

而2.2.1下（在sourcecoreext.js里）的为

复制代码 代码如下:

var ua = navigator.userAgent.toLowerCase();

var isStrict = document.compatMode == "CSS1Compat",

isOpera = ua.indexOf("opera") > -1,

isChrome = ua.indexOf("chrome") > -1,

isSafari = !isChrome && (/webkit|khtml/).test(ua),

isSafari3 = isSafari && ua.indexOf('webkit/5') != -1,

isIE = !isOpera && ua.indexOf("msie") > -1,

isIE7 = !isOpera && ua.indexOf("msie 7") > -1,

isIE8 = !isOpera && ua.indexOf("msie 8") > -1,

isGecko = !isSafari && !isChrome && ua.indexOf("gecko") > -1,

isGecko3 = isGecko && ua.indexOf("rv:1.9") > -1,

isBorderBox = isIE && !isStrict,

isWindows = (ua.indexOf("windows") != -1 || ua.indexOf("win32") != -1),

isMac = (ua.indexOf("macintosh") != -1 || ua.indexOf("mac os x") != -1),

isAir = (ua.indexOf("adobeair") != -1),

isLinux = (ua.indexOf("linux") != -1),

isSecure = window.location.href.toLowerCase().indexOf("https") === 0;