最全，最准确的js判断终端类别（chrome,ie,edge,safari,firefox,opera,Blink）

　　　　　let isOpera = (!!window.opr && !!opr.addons) || !!window.opera || navigator.userAgent.indexOf(' OPR/') >= 0;

// Firefox 1.0+
        let isFirefox = typeof InstallTrigger !== 'undefined';

// Safari 3.0+ "[object HTMLElementConstructor]"
        let isSafari = /constructor/i.test(window.HTMLElement) || (function (p) { return p.toString() === "[object SafariRemoteNotification]"; })(!window['safari'] || (typeof safari !== 'undefined' && safari.pushNotification));

// Internet Explorer 6-11
        let isIE = /*@cc_on!@*/false || !!document.documentMode;

// Edge 20+
        let isEdge = !isIE && !!window.StyleMedia;

// Chrome 1 - 79
        let isChrome = !!window.chrome && (!!window.chrome.webstore || !!window.chrome.runtime);

// Edge (based on chromium) detection
        let isEdgeChromium = isChrome && (navigator.userAgent.indexOf("Edg") != -1);

// Blink engine detection
        let isBlink = (isChrome || isOpera) && !!window.CSS;


        let output = 'Detecting browsers by ducktyping:<hr>';
        output += 'isFirefox: ' + isFirefox + '<br>';
        output += 'isChrome: ' + isChrome + '<br>';
        output += 'isSafari: ' + isSafari + '<br>';
        output += 'isOpera: ' + isOpera + '<br>';
        output += 'isIE: ' + isIE + '<br>';
        output += 'isEdge: ' + isEdge + '<br>';
        output += 'isEdgeChromium: ' + isEdgeChromium + '<br>';
        output += 'isBlink: ' + isBlink + '<br>';
        document.body.innerHTML = output;