获取设备信息相关

QQ判断浏览器环境：

function getBrowser() {
    
    if((!!window.opr && !!opr.addons) || !!window.opera || navigator.userAgent.indexOf(' OPR/') >= 0) {
    
      return 'Opera'
    }

    if(typeof InstallTrigger !== 'undefined') {
    
      return 'Firefox'
    }

    if(/constructor/i.test(window.HTMLElement) || (function (p) {
     return p.toString() === "[object SafariRemoteNotification]"; })(!window['safari'] || (typeof safari !== 'undefined' && window['safari'].pushNotification))) {
    
      return 'Safari'
    }

    var isIE = /*@[email protected]*/false || !!document.documentMode;
    if(isIE) {
    
      return 'IE'
    }

    if(!isIE && !!window.StyleMedia) {
    
      return 'Edge';
    }

    var isChrome = !!window.chrome && (!!window.chrome.webstore || !!window.chrome.runtime);
    if(isChrome) {
    
      return 'Chrome';
    }

    if(isChrome && (navigator.userAgent.indexOf("Edg") != -1)) {
    
      return 'EdgeChromium'
    }
  }