问题
I had several clients complain yesterday that some code stopped working. Apparently it comes down to plug-ins using the now deprecated jQuery.browser which stopped working yesterday when jQuery 1.9 was released.
I (quickly) looked at the 1.9 change docs and it seems like they want me to substitute some pretty heavy libraries just for that one function.
Is there a recommended lightest weight plug-in or code snippet to restore that functionality?
For what these sites need, it's very basic; I only need the most basic detection of IE vs FF vs everyone else.
Suggestions?
回答1:
I've use the following code answered by Alexx Roche, but i wanted to detect MSIE so:
<script type="text/javascript">
$(document).ready(function() {
if (navigator.userAgent.match(/msie/i) ){
alert('I am an old fashioned Internet Explorer');
}
});
</script>
hope it helps!
回答2:
jQuery Migrate was created to allow for backwards compatibility while you update your code.
https://github.com/jquery/jquery-migrate
As a bonus, it logs deprecated functions as you use them. I would give it a try while you resolve the problems. Also, you should be setting a specific version of jQuery for your sites. It's good to upgrade, but be sure to test those upgrades before putting them in production. If you are using a CDN, you can still specify a specific version in the file name.
Now, you don't need a jQuery plugin for what you are asking. Check out the navigator object.
appCodeName: "Mozilla"
appName: "Netscape"
appVersion: "5.0 (Macintosh; Intel Mac OS X 10_6_8) AppleWebKit/537.17 (KHTML, like Gecko) Chrome/24.0.1312.52 Safari/537.17"
cookieEnabled: true
doNotTrack: null
geolocation: Geolocation
language: "en-US"
mimeTypes: MimeTypeArray
onLine: true
platform: "MacIntel"
plugins: PluginArray
product: "Gecko"
productSub: "20030107"
userAgent: "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_6_8) AppleWebKit/537.17 (KHTML, like Gecko) Chrome/24.0.1312.52 Safari/537.17"
vendor: "Google Inc."
vendorSub: ""
回答3:
var browser = {
chrome: false,
mozilla: false,
opera: false,
msie: false,
safari: false
};
var sUsrAg = navigator.userAgent;
if(sUsrAg.indexOf("Chrome") > -1) {
browser.chrome = true;
} else if (sUsrAg.indexOf("Safari") > -1) {
browser.safari = true;
} else if (sUsrAg.indexOf("Opera") > -1) {
browser.opera = true;
} else if (sUsrAg.indexOf("Firefox") > -1) {
browser.mozilla = true;
} else if (sUsrAg.indexOf("MSIE") > -1) {
browser.msie = true;
}
console.log(browser.msie);
回答4:
Put this code in your site (like js file, or after code of jQuery...):
var matched, browser;
// Use of jQuery.browser is frowned upon.
// More details: http://api.jquery.com/jQuery.browser
// jQuery.uaMatch maintained for back-compat
jQuery.uaMatch = function( ua ) {
ua = ua.toLowerCase();
var match = /(chrome)[ \/]([\w.]+)/.exec( ua ) ||
/(webkit)[ \/]([\w.]+)/.exec( ua ) ||
/(opera)(?:.*version|)[ \/]([\w.]+)/.exec( ua ) ||
/(msie) ([\w.]+)/.exec( ua ) ||
ua.indexOf("compatible") < 0 && /(mozilla)(?:.*? rv:([\w.]+)|)/.exec( ua ) ||
[];
return {
browser: match[ 1 ] || "",
version: match[ 2 ] || "0"
};
};
matched = jQuery.uaMatch( navigator.userAgent );
browser = {};
if ( matched.browser ) {
browser[ matched.browser ] = true;
browser.version = matched.version;
}
// Chrome is Webkit, but Webkit is also Safari.
if ( browser.chrome ) {
browser.webkit = true;
} else if ( browser.webkit ) {
browser.safari = true;
}
jQuery.browser = browser;
回答5:
I've used the following code when I hit the same issue:
<script type="text/javascript">
$(document).ready(function() {
//if (!$.browser.webkit && ! $.browser.mozilla) { //depricated
if (!navigator.userAgent.match(/mozilla/i) &&
! navigator.userAgent.match(/webkit/i) ){
alert('Let me tell you about Mozilla');
}
});
</script>
回答6:
You could just not update until you move away from depreciated methods.
You really shouldn't be including jquery from a CDN without specifying a version number anyway, it in a way defeats the purpose of using a CDN (no cacheing).
Here's a link to the latest version of jQuery that supported $.browser:
http://code.jquery.com/jquery-1.8.3.min.js
simply replace your jquery.js src with that link and your code will continue to run until you are ready to move forward and stop using depreciated features.
Note: Fancybox2 still uses $.browser, that's the most common one I've seen so far since the update.
Update: Slickgrid is still using $.browser, no update as of 02/11/2013
回答7:
I abstracted the logic from jQuery.browser into a plugin jquery.browser. The plugin is released under the MIT license.
I've also added support for IE11, Opera Webkit and Android detection.
回答8:
Try Conditionizr
Hope this Helps :)
回答9:
Exact version of IE can be detected by additional checking of existence of standard global objects added in specific IE versions.
10 or older document.all
9 or older document.all && !window.atob
8 or older document.all && !document.addEventListener
7 or older document.all && !document.querySelector
6 or older document.all && !window.XMLHttpRequest
5.x document.all && !document.compatMode
if (document.all && !document.querySelector) {
alert('IE7 or lower');
}
These tests avoid using the userAgent which is used for spoofing
回答10:
if(!$.browser){
$.browser={chrome:false,mozilla:false,opera:false,msie:false,safari:false};
var ua=navigator.userAgent;
$.each($.browser,function(c,a){
$.browser[c]=((new RegExp(c,'i').test(ua)))?true:false;
if($.browser.mozilla && c =='mozilla'){$.browser.mozilla=((new RegExp('firefox','i').test(ua)))?true:false;};
if($.browser.chrome && c =='safari'){$.browser.safari=false;};
});
};
http://jsfiddle.net/R3AAX/3/
回答11:
If all you want is your 3rd party jQuery plugins to be able to use jQuery.browser.msie, here's a one-liner. Just include it after jQuery.
jQuery.browser = jQuery.browser || {msie: navigator.userAgent.match(/msie/i) ? true : false};
This is the dumbest-possible fix, but it's all I needed, and it does work, so here you go!
回答12:
To add to this discussion. I just came up with a jquery $.browser plugin that, instead of 'detection', just merely parses the user agent into an easy-to-use object. Further logic can easily be applied to further break down and parse specific browsers and platforms.
I have had very reliable results on useragents found here: UserAgentString.com. I even included the version detection for ie11 (near the bottom).
//The following code is by no means perfect, nor is it meant to be a standalone 'detection' plugin.
//It demonstrates parsing the useragent string into an easy to manage object.
//Even if it does make detection rediculously easy.. :)
//Because this regex makes no assumptions in advance.
//IMO, It's compatibilty and maintainability is much higher than those based on static identifiers.
/*
uaMatch replacement that parses a useragent string into an object
useragent segments can be Name Value OR Name/Value OR Name
Segment: Name Value
Name: parsed to the last whitespace character
Value: value after the last whitespace character
Matches: (.NET CLR) (#.##), Android 2.3.4, etc
Note: this regex can have leading/trailing whitespace (trimmed for object properties)
Segment: Name/Value
Matches: all values matching Name/Value
Example: Firefox/24.0, Safari/533.1, Version/12.1, etc
Segment: Name
Matches: identifiers that hold no values (value of 'true' is implied)
Example: Macintosh, Linux, Windows, KHTML, U, etc
WARNING: not necessarily compatible with jQuery's $.browser implementation.
- not recommended as a replacement for plugins that require it to function.
*/
(function ($) {
var ua = navigator.userAgent.toLowerCase();
var regex = /compatible; ([\w.+]+)[ \/]([\w.+]*)|([\w .+]+)[: \/]([\w.+]+)|([\w.+]+)/g;
var match = regex.exec(ua);
var browser = { };
while (match != null) {
var prop = {};
if (match[1]) {
prop.type = match[1];
prop.version = match[2];
}
else if (match[3]) {
prop.type = match[3];
prop.version = match[4];
}
else {
prop.type = match[5];
}
// some expressions have leading whitespace (i couldn't avoid this without a more complex expression)
// trim them and get rid of '.' (' .NET CLR' = 'net_clr')
prop.type = $.trim(prop.type).replace(".","").replace(" ","_");
var value = prop.version ? prop.version : true;
if (browser[prop.type]) {
if (!$.isArray(browser[prop.type]))
browser[prop.type] = new Array(browser[prop.type]);
browser[prop.type].push(value);
}
else browser[prop.type] = value;
match = regex.exec(ua);
}
for (var i in browser)
if (i.indexOf("mac") > -1)
browser.mac = true;
if (browser.windows_nt && !browser.windows)
browser.windows = true;
//put known browsers into the 'version' property for 'some' jquery compatibility
//for sake of argument chromium 'is' chrome
if (browser.chromium && !browser.chrome)
browser.chrome = browser.chromium;
//chrome / safari / webkit
if (browser.chrome) {
browser.version = browser.chrome;
}
else if (browser.safari) {
browser.version = browser.safari;
}
else {
if (browser.applewebkit)
browser.webkit = browser.applewebkit;
if (browser.webkit)
browser.version = browser.webkit;
}
//firefox / gecko
if (browser.firefox) {
if (browser.rv)
browser.version = browser.rv;
else browser.version = browser.firefox;
}
else if (browser.gecko) {
if (browser.rv)
browser.version = browser.rv;
else browser.version = browser.gecko;
}
//opera
if (browser.opera && !browser.version)
browser.version = browser.opera;
//msie
if (browser.trident && browser.rv) //ie11
browser.msie = browser.rv;
if (browser.msie)
browser.version = browser.msie;
$.browser = browser;//Rename to reduce confliction?
//WAS USED FOR TESTING & DISCOVERY (very useful)
//TODO: remove line below
alert(JSON.stringify($.browser));
}) (jQuery);
On Internet Explorer 10, JSON.stringify will ouput something like this:
{"mozilla":"5.0","msie":"10.0","windows_nt":"6.2","trident":"6.0","net4.0e":true,"net4.0c":true,"net_clr":["3.5.30729","2.0.50727","3.0.30729"],"windows":true,"version":"10.0"}
回答13:
Short and yet Powerful.
// chrome, safari, webkit, mozilla, msie, opera
var chrome = /chrome/i.test(navigator.userAgent);
来源：https://stackoverflow.com/questions/14365725/easiest-lightest-replacement-for-browser-detection-jquery-1-9