jQuery javaScript js 判断浏览器的类型、版本的方法

在jQuery判断浏览器的类型、版本都是通过正则完成的。在1.4版本中：function brs ( ua ) {ua = ua.toLowerCase();var match = /(webkit)[ //]([/w.]+)/.exec( ua ) ||/(opera)(?:.*version)?[ //]([/w.]+)/.exec( ua ) ||/(msie) ([/w.]+)/.exec( ua ) ||!/compatible/.test( ua ) && /(mozilla)(?:.*? rv:([/w.]+))?/.exec( ua ) || [];/*webkit内核 遨游、Chrome、safari /(webkit)[ //]([/w.]+)/.exec( ua )opera/(opera)(?:.*version)?[ //]([/w.]+)/.exec( ua )ie /(msie) ([/w.]+)/.exec( ua )firefox !/compatible/.test( ua ) && /(mozilla)(?:.*? rv:([/w.]+))?/.exec( ua )*/return { browser: match[1] || "", version: match[2] || "0" };}function test() {alert(brs(navigator.userAgent).browser + "-" + brs(navigator.userAgent).version);}而在1.4之前略有不同：var userAgent = navigator.userAgent.toLowerCase();var browser = {version: (userAgent.match( /.+(?:rv|it|ra|ie)[//: ]([/d.]+)/ ) || [])[1],//判断版本safari: /webkit/.test( userAgent ),opera: /opera/.test( userAgent ),msie: /msie/.test( userAgent ) && !/opera/.test( userAgent ),mozilla: /mozilla/.test( userAgent ) && !/(compatible|webkit)/.test( userAgent )};alert(browser.version + ":" + browser.msie);