1 function versions(){ 2         var a = navigator.userAgent; 3         return navigator.appVersion, { 4             trident: a.indexOf("Trident") > -1, 5             presto: a.indexOf("Presto") > -1, 6             webKit: a.indexOf("AppleWebKit") > -1, 7             gecko: a.indexOf("Gecko") > -1 && -1 == a.indexOf("KHTML"), 8             ios: !!a.match(/\(i[^;]+;( U;)? CPU.+Mac OS X/), 9             android: a.indexOf("Android") > -1 || a.indexOf("Linux") > -1,10             iPhone: a.indexOf("iPhone") > -1,11             iPad: a.indexOf("iPad") > -1,12             webApp: -1 == a.indexOf("Safari")13 }