jquery判断终端

直接上代码--------
     //终端判断
     (function() {
        var os = function() {
                var ua = navigator.userAgent,
                isWindowsPhone = /(?:Windows Phone)/.test(ua),
                isSymbian = /(?:SymbianOS)/.test(ua) || isWindowsPhone,
                isAndroid = /(?:Android)/.test(ua),
                isFireFox = /(?:Firefox)/.test(ua),
                isChrome = /(?:Chrome|CriOS)/.test(ua),
                isTablet = /(?:iPad|PlayBook)/.test(ua) || (isAndroid && !/(?:Mobile)/.test(ua)) || (isFireFox && /(?:Tablet)/.test(ua)),
                isIPhone = /(?:iPhone)/.test(ua) && !isTablet,
                isPc = !isIPhone && !isAndroid && !isSymbian && !isTablet;
                return {
                        isWindowsPhone: isWindowsPhone,
                        isTablet: isTablet,
                        isIPhone: isIPhone,
                        isAndroid: isAndroid,
                        isPc: isPc
                };
        } ();
        if (os.isPc) {
                document.write("
</script></div></script></div>

判断终端。