我想检测用户是否使用 IE 和 Firefox，但我找不到脚本。
我有如下代码：
$(document).ready(function(e) {
$.browser.chrome = /chrom(e|ium)/.test(navigator.userAgent.toLowerCase());
if($.browser.chrome){
alert(1);
//this work well
}
else if(//the browser is IE){alert(2);}
else if(//the browser is Firefox){alert(3);}
//The problem is that I don't know how to write a script for IE and FireFox browser for chrome is work fine
)};
最好的解决方案可能是：使用 Modernizr。
但是，如果您一定要使用 $.browser 属性，您可以使用jQuery Migrate插件（对于 JQuery >= 1.9 - 在早期版本中您可以使用它），然后执行以下操作：
if($.browser.chrome) {
alert(1);
} else if ($.browser.mozilla) {
alert(2);
} else if ($.browser.msie) {
alert(3);
}
如果您出于某种原因需要使用 navigator.userAgent，那么它将是：
$.browser.msie = /msie/.test(navigator.userAgent.toLowerCase());
$.browser.mozilla = /firefox/.test(navigator.userAgent.toLowerCase());
我的即检测解决方案：
if (navigator.userAgent.match(/msie/i) || navigator.userAgent.match(/trident/i) ){
$("html").addClass("ie");
}
需要jQuery。
您可以使用此代码找到正确的浏览器，并且可以对任何目标浏览器进行更改.....
function myFunction() {
if((navigator.userAgent.indexOf("Opera") || navigator.userAgent.indexOf('OPR')) != -1 ){
alert('Opera');
}
else if(navigator.userAgent.indexOf("Chrome") != -1 ){
alert('Chrome');
}
else if(navigator.userAgent.indexOf("Safari") != -1){
alert('Safari');
}
else if(navigator.userAgent.indexOf("Firefox") != -1 ){
alert('Firefox');
}
else if((navigator.userAgent.indexOf("MSIE") != -1 ) || (!!document.documentMode == true )){
alert('IE');
}
else{
alert('unknown');
}
}<!DOCTYPE html>
<html>
<head>
<title>Browser detector</title>
</head>
<body onload="myFunction()">
// your code here
</body>
</html>您不应该编写自己的浏览器检测代码 - 以前已经做过很多次了。使用Modernizr来检测独立的浏览器功能。检测各种功能比检测整个浏览器要好，因为不同的浏览器可能支持不同的功能集，而这些功能甚至可能会随着同一浏览器的不同版本而改变。如果您检测到给定功能的存在，您的代码可能会在更多浏览器中运行得更好。对于各种移动浏览器来说尤其如此。
当您运行 Modernizr 时，它会更新您HEAD元素的class属性，以便它列出您正在使用的浏览器的各种功能 - 然后您可以使用 Javascript 查询该属性并决定如果某个功能存在（或缺失）该怎么办）。
用这个：
(function (factory) {
if (typeof define === 'function' && define.amd) {
// AMD. Register as an anonymous module.
define(['jquery'], function ($) {
return factory($);
});
} else if (typeof module === 'object' && typeof module.exports === 'object') {
// Node-like environment
module.exports = factory(require('jquery'));
} else {
// Browser globals
factory(window.jQuery);
}
}(function(jQuery) {
"use strict";
function uaMatch( ua ) {
// If an UA is not provided, default to the current browser UA.
if ( ua === undefined ) {
ua = window.navigator.userAgent;
}
ua = ua.toLowerCase();
var match = /(edge)\/([\w.]+)/.exec( ua ) ||
/(opr)[\/]([\w.]+)/.exec( ua ) ||
/(chrome)[ \/]([\w.]+)/.exec( ua ) ||
/(version)(applewebkit)[ \/]([\w.]+).*(safari)[ \/]([\w.]+)/.exec( ua ) ||
/(webkit)[ \/]([\w.]+).*(version)[ \/]([\w.]+).*(safari)[ \/]([\w.]+)/.exec( ua ) ||
/(webkit)[ \/]([\w.]+)/.exec( ua ) ||
/(opera)(?:.*version|)[ \/]([\w.]+)/.exec( ua ) ||
/(msie) ([\w.]+)/.exec( ua ) ||
ua.indexOf("trident") >= 0 && /(rv)(?::| )([\w.]+)/.exec( ua ) ||
ua.indexOf("compatible") < 0 && /(mozilla)(?:.*? rv:([\w.]+)|)/.exec( ua ) ||
[];
var platform_match = /(ipad)/.exec( ua ) ||
/(ipod)/.exec( ua ) ||
/(iphone)/.exec( ua ) ||
/(kindle)/.exec( ua ) ||
/(silk)/.exec( ua ) ||
/(android)/.exec( ua ) ||
/(windows phone)/.exec( ua ) ||
/(win)/.exec( ua ) ||
/(mac)/.exec( ua ) ||
/(linux)/.exec( ua ) ||
/(cros)/.exec( ua ) ||
/(playbook)/.exec( ua ) ||
/(bb)/.exec( ua ) ||
/(blackberry)/.exec( ua ) ||
[];
var browser = {},
matched = {
browser: match[ 5 ] || match[ 3 ] || match[ 1 ] || "",
version: match[ 2 ] || match[ 4 ] || "0",
versionNumber: match[ 4 ] || match[ 2 ] || "0",
platform: platform_match[ 0 ] || ""
};
if ( matched.browser ) {
browser[ matched.browser ] = true;
browser.version = matched.version;
browser.versionNumber = parseInt(matched.versionNumber, 10);
}
if ( matched.platform ) {
browser[ matched.platform ] = true;
}
// These are all considered mobile platforms, meaning they run a mobile browser
if ( browser.android || browser.bb || browser.blackberry || browser.ipad || browser.iphone ||
browser.ipod || browser.kindle || browser.playbook || browser.silk || browser[ "windows phone" ]) {
browser.mobile = true;
}
// These are all considered desktop platforms, meaning they run a desktop browser
if ( browser.cros || browser.mac || browser.linux || browser.win ) {
browser.desktop = true;
}
// Chrome, Opera 15+ and Safari are webkit based browsers
if ( browser.chrome || browser.opr || browser.safari ) {
browser.webkit = true;
}
// IE11 has a new token so we will assign it msie to avoid breaking changes
// IE12 disguises itself as Chrome, but adds a new Edge token.
if ( browser.rv || browser.edge ) {
var ie = "msie";
matched.browser = ie;
browser[ie] = true;
}
// Blackberry browsers are marked as Safari on BlackBerry
if ( browser.safari && browser.blackberry ) {
var blackberry = "blackberry";
matched.browser = blackberry;
browser[blackberry] = true;
}
// Playbook browsers are marked as Safari on Playbook
if ( browser.safari && browser.playbook ) {
var playbook = "playbook";
matched.browser = playbook;
browser[playbook] = true;
}
// BB10 is a newer OS version of BlackBerry
if ( browser.bb ) {
var bb = "blackberry";
matched.browser = bb;
browser[bb] = true;
}
// Opera 15+ are identified as opr
if ( browser.opr ) {
var opera = "opera";
matched.browser = opera;
browser[opera] = true;
}
// Stock Android browsers are marked as Safari on Android.
if ( browser.safari && browser.android ) {
var android = "android";
matched.browser = android;
browser[android] = true;
}
// Kindle browsers are marked as Safari on Kindle
if ( browser.safari && browser.kindle ) {
var kindle = "kindle";
matched.browser = kindle;
browser[kindle] = true;
}
// Kindle Silk browsers are marked as Safari on Kindle
if ( browser.safari && browser.silk ) {
var silk = "silk";
matched.browser = silk;
browser[silk] = true;
}
// Assign the name and platform variable
browser.name = matched.browser;
browser.platform = matched.platform;
return browser;
}
// Run the matching process, also assign the function to the returned object
// for manual, jQuery-free use if desired
window.jQBrowser = uaMatch( window.navigator.userAgent );
window.jQBrowser.uaMatch = uaMatch;
// Only assign to jQuery.browser if jQuery is loaded
if ( jQuery ) {
jQuery.browser = window.jQBrowser;
}
return window.jQBrowser;
}));