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)),isPhone = /(?:iPhone)/.test(ua) && !isTablet,isPc = !isPhone && !isAndroid && !isSymbian;return {isTablet: isTablet,isPhone: isPhone,isAndroid: isAndroid,isPc: isPc};}();if (os.isAndroid || os.isPhone) {    //alert("手机" );} else if (os.isTablet) {    //alert("平板" );} else if (os.isPc) {    //alert("电脑" );