2019独角兽企业重金招聘Python工程师标准>>> 
浏览器检测是在工作中经常用到的，如果只是简单判断当前是什么浏览器的话可以通过window.navigator.useragent这样的js来直接判断就可以了！
但是针对浏览器版本要求比较高的时候，如果只是单纯的判断浏览器的名字的话还不能解决问题，这时候就要通过其他方式来实现！现有的jquery已经废弃了$.browser的使用，所以在这里我介绍一个叫做"浏览器嗅探器"的程序来实现！
代码如下：（BrowserDetect.js）
var BrowserDetect = {init: function () {this.browser = this.searchString(this.dataBrowser) || "An unknown browser";this.version = this.searchVersion(navigator.userAgent)|| this.searchVersion(navigator.appVersion)|| "an unknown version";this.OS = this.searchString(this.dataOS) || "an unknown OS";},searchString: function (data) {for (var i=0;i<data.length;i++) {var dataString = data[i].string;var dataProp = data[i].prop;this.versionSearchString = data[i].versionSearch || data[i].identity;if (dataString) {if (dataString.indexOf(data[i].subString) != -1)return data[i].identity;}else if (dataProp)return data[i].identity;}},searchVersion: function (dataString) {var index = dataString.indexOf(this.versionSearchString);if (index == -1) return;return parseFloat(dataString.substring(index+this.versionSearchString.length+1));},dataBrowser: [{string: navigator.userAgent,subString: "Chrome",identity: "Chrome"},{ string: navigator.userAgent,subString: "OmniWeb",versionSearch: "OmniWeb/",identity: "OmniWeb"},{string: navigator.vendor,subString: "Apple",identity: "Safari",versionSearch: "Version"},{prop: window.opera,identity: "Opera"},{string: navigator.vendor,subString: "iCab",identity: "iCab"},{string: navigator.vendor,subString: "KDE",identity: "Konqueror"},{string: navigator.userAgent,subString: "Firefox",identity: "Firefox"},{string: navigator.vendor,subString: "Camino",identity: "Camino"},{ // for newer Netscapes (6+)string: navigator.userAgent,subString: "Netscape",identity: "Netscape"},{string: navigator.userAgent,subString: "MSIE",identity: "Internet Explorer",versionSearch: "MSIE"},{string: navigator.userAgent,subString: "Gecko",identity: "Mozilla",versionSearch: "rv"},{ // for older Netscapes (4-)string: navigator.userAgent,subString: "Mozilla",identity: "Netscape",versionSearch: "Mozilla"}],dataOS : [{string: navigator.platform,subString: "Win",identity: "Windows"},{string: navigator.platform,subString: "Mac",identity: "Mac"},{string: navigator.userAgent,subString: "iPhone",identity: "iPhone/iPod"},{string: navigator.platform,subString: "Linux",identity: "Linux"}]};
BrowserDetect.init();使用方式如下：
BrowserDetect.browser;// 浏览器的名称，例如Firefox，IE
BrowserDetect.version;//浏览器的版本，比如，7、11
BrowserDetect.OS;//浏览器所宿主的操作系统，比如Windows、Linux
