浏览器版本判断

• 浏览器版本判定:

// Browser environment sniffing
const inBrowser = typeof window !== 'undefined'
const UA = inBrowser && window.navigator.userAgent.toLowerCase()
const isIE = UA && /msie|trident/.test(UA)
const isIE9 = UA && UA.indexOf('msie 9.0') > 0
const isEdge = UA && UA.indexOf('edge/') > 0
const isAndroid = UA && UA.indexOf('android') > 0
const isIOS = UA && /iphone|ipad|ipod|ios/.test(UA)
const isChrome = UA && /chrome\/\d+/.test(UA) && !isEdge