const isChrome = /Chrome/.test(navigator.userAgent)
const isFirefox = /Firefox/.test(navigator.userAgent)

简单:

var OSName="Unknown OS"; if (navigator.appVersion.indexOf("Win")!=-1) OSName="Windows"; if (navigator.appVersion.indexOf("Mac")!=-1) OSName="MacOS"; if (navigator.appVersion.indexOf("X11")!=-1) OSName="UNIX"; if (navigator.appVersion.indexOf("Linux")!=-1) OSName="Linux"; if (navigator.appVersion.indexOf("Linux x86_64")!=-1) OSName="Ubuntu"; var nVer = navigator.appVersion; var nAgt = navigator.userAgent; var browserName = navigator.appName; var fullVersion = ''+parseFloat(navigator.appVersion); var majorVersion = parseInt(navigator.appVersion,10); var nameOffset,verOffset,ix; // In Opera, the true version is after "Opera" or after "Version" if ((verOffset=nAgt.indexOf("Opera"))!=-1) { browserName = "Opera"; fullVersion = nAgt.substring(verOffset+6); if ((verOffset=nAgt.indexOf("Version"))!=-1) fullVersion = nAgt.substring(verOffset+8); } // In MSIE, the true version is after "MSIE" in userAgent else if ((verOffset=nAgt.indexOf("MSIE"))!=-1) { browserName = "Microsoft Internet Explorer"; fullVersion = nAgt.substring(verOffset+5); } // In Chrome, the true version is after "Chrome" else if ((verOffset=nAgt.indexOf("Chrome"))!=-1) { browserName = "Chrome"; fullVersion = nAgt.substring(verOffset+7); } // In Safari, the true version is after "Safari" or after "Version" else if ((verOffset=nAgt.indexOf("Safari"))!=-1) { browserName = "Safari"; fullVersion = nAgt.substring(verOffset+7); if ((verOffset=nAgt.indexOf("Version"))!=-1) fullVersion = nAgt.substring(verOffset+8); } // In Firefox, the true version is after "Firefox" else if ((verOffset=nAgt.indexOf("Firefox"))!=-1) { browserName = "Firefox"; fullVersion = nAgt.substring(verOffset+8); } // In most other browsers, "name/version" is at the end of userAgent else if ( (nameOffset=nAgt.lastIndexOf(' ')+1) < (verOffset=nAgt.lastIndexOf('/')) ) { browserName = nAgt.substring(nameOffset,verOffset); fullVersion = nAgt.substring(verOffset+1); if (browserName.toLowerCase()==browserName.toUpperCase()) { browserName = navigator.appName; } } // trim the fullVersion string at semicolon/space if present if ((ix=fullVersion.indexOf(";"))!=-1) fullVersion=fullVersion.substring(0,ix); if ((ix=fullVersion.indexOf(" "))!=-1) fullVersion=fullVersion.substring(0,ix); majorVersion = parseInt(''+fullVersion,10); if (isNaN(majorVersion)) { fullVersion = ''+parseFloat(navigator.appVersion); majorVersion = parseInt(navigator.appVersion,10); } document.write('' +'Hey! i see you\'re using '+browserName+'! <br>' +'The full version of it is '+fullVersion+'. <br>' +'Your major version is '+majorVersion+', <br>' +'And your "navigator.appName" is '+navigator.appName+'. <br>' +'Your "navigator.userAgent" is '+navigator.userAgent+'. <br>' ) document.write('And, your OS is '+OSName+'. <br>');

不知道它是否对任何人都有用，但这里有一个变体，会让TypeScript高兴:

export function getBrowser() {

 // Opera 8.0+
    if ((!!window["opr"] && !!["opr"]["addons"]) || !!window["opera"] || navigator.userAgent.indexOf(' OPR/') >= 0) {
        return 'opera';
    }

    // Firefox 1.0+
    if (typeof window["InstallTrigger"] !== 'undefined') {
        return 'firefox';
    }

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

    // Internet Explorer 6-11
    if (/*@cc_on!@*/false || !!document["documentMode"]) {
        return 'ie';
    }

    // Edge 20+
    if (!(/*@cc_on!@*/false || !!document["documentMode"]) && !!window["StyleMedia"]) {
        return 'edge';
    }

    // Chrome 1+
    if (!!window["chrome"] && !!window["chrome"].webstore) {
        return 'chrome';
    }

    // Blink engine detection
    if (((!!window["chrome"] && !!window["chrome"].webstore) || ((!!window["opr"] && !!["opr"]["addons"]) || !!window["opera"] || navigator.userAgent.indexOf(' OPR/') >= 0)) && !!window["CSS"]) {
        return 'blink';
    }
}

var BrowserType; (function (BrowserType) { BrowserType["OPERA"] = "Opera"; BrowserType["OPERA2"] = "OPR"; BrowserType["EDGE"] = "Edg"; BrowserType["CHROME"] = "Chrome"; BrowserType["SAFARI"] = "Safari"; BrowserType["FIREFOX"] = "Firefox"; BrowserType["UNKNOWN"] = "unknown"; })(BrowserType || (BrowserType = {})); const detectBrowser = () => { return Object.values(BrowserType).find((browser) => navigator.userAgent.indexOf(browser) != -1); }; console.log(detectBrowser());

使用以下代码检查IE浏览器。

console.log(/MSIE|Trident/.test(window.navigator.userAgent))

OR

var isIE = !!document.documentMode; 

console.log(isIE)

谢谢

你可以像这样检测它:

if (typeof navigator !== 'undefined' && navigator.userAgent && navigator.userAgent.toLowerCase().match(/firefox\/(\d+)/)) {
   alert('Firefox');
}