新的UA判断

var os = this.os = {}, browser = this.browser = {},
webkit = ua.match(/WebKit\/([\d.]+)/),
android = ua.match(/(Android)\s+([\d.]+)/),
ipad = ua.match(/(iPad).*OS\s([\d_]+)/),
iphone = !ipad && ua.match(/(iPhone\sOS)\s([\d_]+)/),
webos = ua.match(/(webOS|hpwOS)[\s\/]([\d.]+)/),
touchpad = webos && ua.match(/TouchPad/),
kindle = ua.match(/Kindle\/([\d.]+)/),
silk = ua.match(/Silk\/([\d._]+)/),
blackberry = ua.match(/(BlackBerry).*Version\/([\d.]+)/)

// todo clean this up with a better OS/browser
// separation. we need to discern between multiple
// browsers on android, and decide if kindle fire in
// silk mode is android or not

if (browser.webkit = !!webkit) browser.version = webkit[1]

if (android) os.android = true, os.version = android[2]
if (iphone) os.ios = os.iphone = true, os.version = iphone[2].replace(/_/g, '.')
if (ipad) os.ios = os.ipad = true, os.version = ipad[2].replace(/_/g, '.')
if (webos) os.webos = true, os.version = webos[2]
if (touchpad) os.touchpad = true
if (blackberry) os.blackberry = true, os.version = blackberry[2]
if (kindle) os.kindle = true, os.version = kindle[1]
if (silk) browser.silk = true, browser.version = silk[1]
if (!silk && os.android && ua.match(/Kindle Fire/)) browser.silk = true
}

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