检测 JS 中所有 Firefox 版本

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最佳答案

这将检测到任何版本的 Firefox:

var isFirefox = navigator.userAgent.toLowerCase().indexOf('firefox') > -1;

更具体地说:

if(navigator.userAgent.toLowerCase().indexOf('firefox') > -1){
// Do Firefox-related activities
}

您可能需要考虑使用现代化特性检测或相关工具来完成您需要的任务。

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给你

var ffversion = '18';
var is_firefox = navigator.userAgent.toLowerCase().indexOf('firefox/'+ffversion) > -1;
alert(is_firefox);

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这个脚本检测桌面版 Firefox 的所有版本，从版本1到46。

这是我第三次在 StackOverflow 上尝试回答这个问题，因为我一直在寻找破坏脚本的新方法。不过，我觉得现在起作用了。了解 Firefox 的特性是一个很好的练习，看看事情是如何发展的也很有趣。脚本可以用不同的功能重写，我选择了一些我认为会是最有用的，我希望有人重写与其他更有用的功能和张贴在这里，并比较结果。

我将脚本放在 try 语句中，以防用户在 about. config 中有任何禁用设置。否则，我会在每个版本的 Firefox 上测试，它会检测到每个版本。我在评论中简要描述了每个特性的用途。我也想为 Webkit 这样做，但发现文档不是很好。Mozilla 很容易下载以前的版本和详细的版本。

// Element to display version
var outputVersion = document.getElementById("displayFoxVersion");


try {
// Match UserAgent string with Firefox Desktop
// Detect hybrid Gecko browsers and mobile
if (navigator.userAgent.match(/firefox/i) &&
!navigator.userAgent.match(/mobi|tablet|fennec|android|netscape|seamonkey|iceweasel|iceape|icecat|waterfox|gnuzilla|shadowfox|swiftfox/i)) {


// Create Element and Array to test availability
var createdElement = document.createElement('div'),
createdArray = [],
firefoxVersion = "0";


// Firefox 1.0 released November 9, 2004
// Check a current feature as being true, or NOT undefined
// AND check future features as EQUAL undefined
if (typeof window.alert !== "undefined" &&
typeof window.XPCNativeWrapper === "undefined" &&
typeof window.URL === "undefined") {
firefoxVersion = "1";
}


// Firefox 1.5 released October 15, 2003
// XPCNativeWrapper used to create security wrapper
else if (typeof window.XPCNativeWrapper !== "undefined" &&
typeof window.globalStorage === "undefined" &&
typeof window.devicePixelRatio === "undefined" &&
typeof createdElement.style.animation === "undefined" &&
typeof document.querySelector === "undefined") {
firefoxVersion = "1.5";
}


// Firefox 2 released October 24, 2006
// globalStorage later deprecated in favor of localstorage
else if (typeof window.globalStorage !== "undefined" &&
typeof window.postMessage === "undefined") {
firefoxVersion = "2";
}


// Firefox 3 released June 17, 2008
// postMessage for cross window messaging
else if (typeof window.postMessage !== "undefined" &&
typeof document.querySelector === "undefined") {
firefoxVersion = "3";
}


// Firefox 3.5 released June 30, 2009
// querySelector returns list of the elements from document
else if (typeof document.querySelector !== "undefined" &&
typeof window.mozRequestAnimationFrame === "undefined" &&
typeof Reflect === "undefined") {
firefoxVersion = "3.5";
}


// Firefox 4 released March 22, 2011
// window.URL is Gecko, Webkit is window.webkitURL, manages object URLs
else if (typeof window.URL !== "undefined" &&
typeof createdElement.style.MozAnimation === "undefined") {
firefoxVersion = "4";
}


// After April 2011 releases every six weeks on Tuesday


// Firefox 5 released June 21, 2011
// style.MozAnimation for CSS animation, renamed to style.animation
else if (typeof createdElement.style.MozAnimation !== "undefined" &&
typeof WeakMap === "undefined") {
firefoxVersion = "5";
}


// Firefox 6 released August 16, 2011
// WeakMap collects key value pairs weakly referenced
else if (typeof WeakMap !== "undefined" &&
typeof createdElement.style.textOverflow === "undefined") {
firefoxVersion = "6";
}


// Firefox 7 released September 27, 2011
// textOverflow manages overflowed non displayed content
else if (typeof createdElement.style.textOverflow !== "undefined" &&
typeof createdElement.insertAdjacentHTML === "undefined") {
firefoxVersion = "7";
}


// Firefox 8 released November 8, 2011
// insertAdjacentHTML parses as HTML and inserts into specified position
// faster than direct innerHTML manipulation and
// appends without affecting other elements under the same parent
else if (typeof createdElement.insertAdjacentHTML !== "undefined" &&
typeof navigator.doNotTrack === "undefined") {
firefoxVersion = "8";
}


// Firefox 9 released December 20, 2011
// mozIndexedDB dropped ver 16, renamed window.indexedDB
// IndexDB improved functionality than localstorage
else if (typeof window.mozIndexedDB !== "undefined" &&
typeof document.mozFullScreenEnabled === "undefined") {
firefoxVersion = "9";
}


// Firefox 10 released January 31, 2012
// mozFullScreenEnabled reports if full-screen mode is available
else if (typeof document.mozFullScreenEnabled !== "undefined" &&
typeof window.mozCancelAnimationFrame === "undefined" &&
typeof Reflect === "undefined") {
firefoxVersion = "10";
}


// Firefox 11 released March 13, 2012
// mozCancelAnimationFrame prior to Firefox 23 prefixed with moz
// Cancels an animation frame request
else if (typeof window.mozCancelAnimationFrame !== "undefined" &&
typeof createdElement.style.MozTextAlignLast === "undefined") {
firefoxVersion = "11";
}


// Firefox 12 released April 24, 2012
// MozTextAlignLast how the last line is aligned
else if (typeof createdElement.style.MozTextAlignLast !== "undefined" &&
typeof createdElement.style.MozOpacity !== "undefined") {
firefoxVersion = "12";
}


// Firefox 13 released June 5, 2012
// MozOpacity dropped from this version
else if (typeof createdElement.style.MozOpacity === "undefined" &&
typeof window.globalStorage !== "undefined") {
firefoxVersion = "13";
}


// Firefox 14 released June 26, 2012
// globalStorage dropped from this version
else if (typeof window.globalStorage === "undefined" &&
typeof createdElement.style.borderImage === "undefined" &&
typeof document.querySelector !== "undefined") {
firefoxVersion = "14";
}


// Firefox 15 released August 28, 2012
// borderImage allows drawing an image on the borders of elements
else if (typeof createdElement.style.borderImage !== "undefined" &&
typeof createdElement.style.animation === "undefined") {
firefoxVersion = "15";
}


// Firefox 16 released October 9, 2012
// animation was MozAnimation
else if (typeof createdElement.style.animation !== "undefined" &&
typeof createdElement.style.iterator === "undefined" &&
typeof Math.hypot === "undefined") {
firefoxVersion = "16";
}


// Firefox 17 released November 20, 2012
// version 27 drops iterator and renames italic
// Used to iterate over enumerable properties of an object
else if (typeof createdElement.style.iterator !== "undefined" &&
typeof window.devicePixelRatio === "undefined") {
firefoxVersion = "17";
}


// Firefox 18 released January 8, 2013
// devicePixelRatio returns ratio of one vertical pixel between devices
else if (typeof window.devicePixelRatio !== "undefined" &&
typeof window.getInterface === "undefined" &&
typeof createdElement.style.mixBlendMode === "undefined") {
firefoxVersion = "18";
}


// Firefox 19 released February 19, 2013
// getInterface dropped and renamed in version 32
// Retrieves specified interface pointers
else if (typeof window.getInterface !== "undefined" &&
typeof Math.imul === "undefined") {
firefoxVersion = "19";
}


// Firefox 20 released April 2, 2013
// Math.imul provides fast 32 bit integer multiplication
else if (typeof Math.imul !== "undefined" &&
typeof window.crypto.getRandomValues === "undefined") {
firefoxVersion = "20";
}


// Firefox 21 released May 14, 2013
// getRandomValues lets you get cryptographically random values
else if (typeof window.crypto.getRandomValues !== "undefined" &&
typeof createdElement.style.flex === "undefined") {
firefoxVersion = "21";
}


// Firefox 22 released June 25, 2013
// flex can alter dimensions to fill available space
else if (typeof createdElement.style.flex !== "undefined" &&
typeof window.cancelAnimationFrame === "undefined") {
firefoxVersion = "22";
}


// Firefox 23 released August 6, 2013
// cancelAnimationFrame was mozCancelAnimationFrame
else if (typeof window.cancelAnimationFrame !== "undefined" &&
typeof document.loadBindingDocument !== "undefined" &&
typeof Math.trunc === "undefined") {
firefoxVersion = "23";
}


// Firefox 24 released September 17, 2013
// loadBindingDocument dropped
// loadBindingDocument reintroduced in 25 then dropped again in 26
else if (typeof document.loadBindingDocument === "undefined" &&
typeof Math.trunc === "undefined") {
firefoxVersion = "24";
}


// Firefox 25 released October 29, 2013
// Math.trunc returns number removing fractional digits
else if (typeof Math.trunc !== "undefined" &&
typeof document.loadBindingDocument !== "undefined") {
firefoxVersion = "25";
}


// Firefox 26 released December 10, 2013
// loadBindingDocument dropped
else if (typeof Math.trunc !== "undefined" &&
typeof Math.hypot === "undefined") {
firefoxVersion = "26";
}


// Firefox 27 released February 4, 2014
// Math.hypot returns square root of the sum of squares
else if (typeof Math.hypot !== "undefined" &&
typeof createdArray.entries === "undefined") {
firefoxVersion = "27";
}


// Firefox 28 released March 18, 2014
// entries returns key value pairs for arrays
else if (typeof createdArray.entries !== "undefined" &&
typeof createdElement.style.boxSizing === "undefined") {
firefoxVersion = "28";
}


// Firefox 29 released April 29, 2014
// boxSizing alters CSS box model, calculates width and height of elements
else if (typeof createdElement.style.boxSizing != "undefined" &&
typeof createdElement.style.backgroundBlendMode === "undefined") {
firefoxVersion = "29";
}


// Firefox 30 released June 10, 2014
// backgroundBlendMode blends elements background images
else if (typeof createdElement.style.backgroundBlendMode !== "undefined" &&
typeof createdElement.style.paintOrder === "undefined") {
firefoxVersion = "30";
}


// Firefox 31 released July 22, 2014
// paintOrder specifies the order fill, stroke, markers of shape or element
else if (typeof createdElement.style.paintOrder !== "undefined" &&
typeof createdElement.style.mixBlendMode === "undefined") {
firefoxVersion = "31";
}


// Firefox 32 released September 2, 2014
// mixBlendMode how an element should blend
else if (typeof createdElement.style.mixBlendMode !== "undefined" &&
typeof Number.toInteger !== "undefined") {
firefoxVersion = "32";
}


// Firefox 33 released October 14, 2014
// numberToIntger dropped, used to convert values to integer
else if (typeof Number.toInteger === "undefined" &&
typeof createdElement.style.fontFeatureSettings === "undefined") {
firefoxVersion = "33";
}


// Firefox 34 released December 1, 2014
// fontFeatureSettings control over advanced typographic features
else if (typeof createdElement.style.fontFeatureSettings !== "undefined" &&
typeof navigator.mozIsLocallyAvailable !== "undefined") {
firefoxVersion = "34";
}


// Firefox 35 released January 13, 2015
// mozIsLocallyAvailable dropped
else if (typeof navigator.mozIsLocallyAvailable === "undefined" &&
typeof createdElement.style.MozWindowDragging === "undefined") {
firefoxVersion = "35";
}


// Firefox 36 released February 24, 2015
// quote returns a copy of the string
else if (typeof String.quote !== "undefined" &&
typeof createdElement.style.MozWindowDragging !== "undefined") {
firefoxVersion = "36";
}


// Firefox 37 released March 31, 2015
// quote quickly dropped
else if (typeof String.quote === "undefined" &&
typeof createdElement.style.rubyPosition === "undefined") {
firefoxVersion = "37";
}


// Firefox 38 released May 12, 2015
// rubyPosition defines position of a ruby element relative to its base element
else if (typeof createdElement.style.rubyPosition !== "undefined" &&
typeof window.Headers === "undefined") {
firefoxVersion = "38";
}


// Firefox 39 released July 2, 2015
// Headers allows us to create our own headers objects
else if (typeof window.Headers !== "undefined" &&
typeof Symbol.match === "undefined") {
firefoxVersion = "39";
}


// Firefox 40 released August 11, 2015
// match matches a regular expression against a string
else if (typeof Symbol.match !== "undefined" &&
typeof Symbol.species === "undefined") {
firefoxVersion = "40";
}


// Firefox 41 released September 22, 2015
// species allows subclasses to over ride the default constructor
else if (typeof Symbol.species !== "undefined" &&
typeof Reflect === "undefined") {
firefoxVersion = "41";
}


// Firefox 42 released November 3, 2015
// mozRequestAnimationFrame and mozFullScreenEnabled dropped
// Reflect offers methods for interceptable JavaScript operations
else if (typeof Reflect !== "undefined" &&
typeof window.screen.orientation === "undefined") {
firefoxVersion = "42";
}


// Firefox 43 released December 15, 2015
// orientation is mozOrientation in B2G and Android
else if (typeof window.screen.orientation !== "undefined" &&
typeof document.charset === "undefined") {
firefoxVersion = "43";
}


// Firefox 44 released January 26, 2016
// charset is for legacy, use document.characterSet
else if (typeof document.charset !== "undefined" &&
typeof window.onstorage === "undefined") {
firefoxVersion = "44";
}


// Firefox 45 released March 8, 2016
// onstorage contains an event handler that runs when the storage event fires
else if (typeof window.onstorage !== "undefined" &&
typeof window.onabsolutedeviceorientation === "undefined") {
firefoxVersion = "45";
}


// Firefox 46 - beta
// onabsolutedeviceorientation
else if (typeof window.onabsolutedeviceorientation !== "undefined") {
firefoxVersion = "46 or above";
}


// Else could not verify
else {
outputVersion.innerHTML = "Could not verify Mozilla Firefox";
}


// Display Firefox version
outputVersion.innerHTML = "Verified as Mozilla Firefox " + firefoxVersion;


// Else not detected
} else {
outputVersion.innerHTML = "Mozilla Firefox not detected";
}
} catch (e) {
// Statement to handle exceptions
outputVersion.innerHTML = "An error occured. This could be because the default settings in Firefox have changed. Check about.config ";
}

<div id="displayFoxVersion"></div>

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如果你想知道 FireFox 的数字版本是什么，你可以使用下面的代码片段:

var match = window.navigator.userAgent.match(/Firefox\/([0-9]+)\./);
var ver = match ? parseInt(match[1]) : 0;

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很长一段时间以来，我一直在使用另一种选择:

('netscape' in window) && / rv:/.test(navigator.userAgent)

因为我不信任用户代理字符串。有些 bug 是无法通过特征提取检测到的，所以检测浏览器是一些变通方法所必需的。

另外，如果你正在解决 Gecko 中的一个 bug，那么这个 bug 可能也存在于 Firefox 的衍生产品中，这段代码也应该与衍生产品一起工作(Waterfox 和 Pale Moon 在用户代理字符串中有‘ Firefox’吗.

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    <script type="text/javascript">
var isChrome = /Chrome/.test(navigator.userAgent) && /Google
Inc/.test(navigator.vendor);
var isFirefox =
navigator.userAgent.toLowerCase().indexOf('firefox') > -1;
if (isChrome)
{
document.write('<'+'link rel="stylesheet"
href="css/chrome.css" />');


}
else if(isFirefox)
{
document.write('<'+'link rel="stylesheet"
href="css/Firefox.css" />');
}
else
{
document.write('<'+'link rel="stylesheet"
href="css/IE.css" />');
}


</script>

这对 IE，Firefox 和 Chrome 来说是完美的。

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另一种回答是:

parseFloat(navigator.userAgent.split('Firefox/').pop(), 10) >= 92;

应该比使用 regexp 更快。

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检测用户代理，然后在响应中检查 Firefox:

navigator.userAgent.toLowerCase().includes('firefox') // true || false