获取微信版本、手机操作系统、手机类型

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let system = {} let userAgent = navigator.userAgent // 获取微信版本 let systemInfo = userAgent.match(/MicroMessenger.*?(?= )/) if (systemInfo && systemInfo.length > 0) {   system.wechat = systemInfo[0] } // 苹果手机 if (userAgent.includes('iPhone') || userAgent.includes('iPad')) {   if (userAgent.includes('iPad')) {       system.device = 'iPad'   } else {       system.device = 'iPhone'   }   // 获取操作系统版本   systemInfo = userAgent.match(/iPhone OS .*?(?= )/)   if (systemInfo && systemInfo.length > 0) {       system.system = systemInfo[0]   } } // 安卓手机 if (userAgent.includes('Android')) {   systemInfo = userAgent.match(/Android.*; ?(.*(?= Build))/)   if (systemInfo && systemInfo.length > 1) {     system.device = systemInfo[1]   }   // 获取操作系统版本   systemInfo = userAgent.match(/Android.*?(?=;)/)   if (systemInfo && systemInfo.length > 0) {     system.system = systemInfo[0]   } } alert(JSON.stringify(system))