js 检测浏览器版本

test{
isIE: function(){ return !+"\v1"; },
isFF: function(){ return !!_V_.ua.match("Firefox") },
isIPad: function(){ return navigator.userAgent.match(/iPad/i) !== null; },
isIPhone: function(){ return navigator.userAgent.match(/iPhone/i) !== null; },
isIOS: function(){ return VideoJS.isIPhone() || VideoJS.isIPad(); },
iOSVersion: function() {
var match = navigator.userAgent.match(/OS (\d+)_/i);
if (match && match[1]) { return match[1]; }
},
isAndroid: function(){ return navigator.userAgent.match(/Android.*AppleWebKit/i) !== null; },
androidVersion: function() {
var match = navigator.userAgent.match(/Android (\d+)\./i);
if (match && match[1]) { return match[1]; }
}
}