js擷取用戶端作業系統

一個項目中碰到的問題，頁面標題和導航的字型在macosx下沒有，因為不同的字型，相同的font-size，顯示的大小也不一樣，所以導致macosx下錯位。想到的解決辦法就是通過js的navigator.platform擷取用戶端的作業系統，然對針對macosx單獨加個class,以下這段代碼是在網上找的，其實就是個類似系統的對照表。

JS:

function detectOS() {    var sUserAgent = navigator.userAgent;    var isWin = (navigator.platform == "Win32") || (navigator.platform == "Windows");    var isMac = (navigator.platform == "Mac68K") || (navigator.platform == "MacPPC") || (navigator.platform == "Macintosh") || (navigator.platform == "MacIntel");    if (isMac) return "Mac";    var isUnix = (navigator.platform == "X11") && !isWin && !isMac;    if (isUnix) return "Unix";    var isLinux = (String(navigator.platform).indexOf("Linux") > -1);    if (isLinux) return "Linux";    if (isWin) {var isWin2K = sUserAgent.indexOf("Windows NT 5.0") > -1 || sUserAgent.indexOf("Windows 2000") > -1;if (isWin2K) return "Win2000";var isWinXP = sUserAgent.indexOf("Windows NT 5.1") > -1 || sUserAgent.indexOf("Windows XP") > -1;if (isWinXP) return "WinXP";var isWin2003 = sUserAgent.indexOf("Windows NT 5.2") > -1 || sUserAgent.indexOf("Windows 2003") > -1;if (isWin2003) return "Win2003";var isWinVista= sUserAgent.indexOf("Windows NT 6.0") > -1 || sUserAgent.indexOf("Windows Vista") > -1;if (isWinVista) return "WinVista";var isWin7 = sUserAgent.indexOf("Windows NT 6.1") > -1 || sUserAgent.indexOf("Windows 7") > -1;if (isWin7) return "Win7";    }    return "other";}document.writeln("您的作業系統是：" + detectOS());