UAを参照しないでブラウザを判定する方法 ref: http://qiita.com/items/2b97592826fa2d480b70

file0.txt

var w = window,
    d = w.document,
    dE = d.documentElement,
    unavailableQuerySelector = isUndefined(d.querySelector),
    unavailablePerformance = isUndefined(w.performance),
    isIE = !isUndefined(d.uniqueID),
    ltIE6 = isIE && isUndefined(dE.style.maxHeight),
    ltIE7 = isIE && unavailableQuerySelector,
    ltIE8 = isIE && isUndefined (d.getElementsByClassName),
    ltIE9 = isIE && isUndefined(w.Worker),
    isIE6 = isIE && ltIE6,
    isIE7 = isIE && ltIE7 && !ltIE6,
    isIE8 = isIE && ltIE8 && !ltIE7 && !ltIE6,
    isIE9 = isIE && ltIE9 && !ltIE8 && !ltIE7 && !ltIE6,
    isIE10 = isIE && !ltIE9 && !ltIE8 && !ltIE7 && !ltIE6,
    isMoz = !isIE && !isUndefined(w.sidebar),
    ltFirefox3 = isMoz && unavailableQuerySelector,
    ltFirefox36 = isMoz && isUndefined(w.ArrayBuffer),
    ltFirefox6 = isMoz && unavailablePerformance,
    isOpera = !isIE && !isUndefined(w.opera),
    isWebkit = !isIE && !isMoz && !isOpera && !isUndefined(d.querySelectorAll),
    isMobileWebkit = isWebkit && !isUndefined(w.ontouchstart),
    isChrome = isWebkit && !unavailablePerformance && ! isUndefined(w.EventSource),
    isSafari = isWebkit && !isChrome,
    ltSafari4 = isSafari && isUndefined(w.matchMedia),
    ltSafari5 = isSafari && isUndefined(w.FileReader),
    isSafari4 = isSafari && ltSafari4,
    isSafari5 = isSafari && ltSafari5 && !ltSafari4,
    isSafari6 = isSafari && !ltSafari5 && !ltSafari4,
    isMobileChrome = isChrome && isMobileWebkit,
    isMobileSafari = isSafari && isMobileWebkit,
    support = {
        isIE: isIE,
        ltIE6: ltIE6,
        ltIE7: ltIE7,
        ltIE8: ltIE8,
        ltIE9: ltIE9,
        isIE6: isIE6,
        isIE7: isIE7,
        isIE8: isIE8,
        isIE9: isIE9,
        isIE10: isIE10,
        isMoz: isMoz,
        ltFirefox3: ltFirefox3,
        ltFirefox36: ltFirefox36,
        ltFirefox6: ltFirefox6,
        isOpera: isOpera,
        isWebkit: isWebkit,
        isChrome: isChrome,
        isSafari: isSafari,
        ltSafari4: ltSafari4,
        ltSafari5: ltSafari5,
        isSafari4: isSafari4,
        isSafari5: isSafari5,
        isSafari6: isSafari6,
        isMobileWebkit: isMobileWebkit,
        isMobileChrome: isMobileChrome,
        isMobileSafari: isMobileSafari
    };

function isUndefined (value, undefined) {
    return value === undefined;
}

console.log(support);