JavaScript判断浏览器与版本号

主流的浏览器包括： chrome,IE, Firefox, Opera, Safar

• 判断浏览器的版本通过浏览器的特性或是其 userAgent

浏览器名称	特征	UserAgent
IE	ActiveXObject()	Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.0) Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.2) Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1) Mozilla/4.0 (compatible; MSIE 5.0; Windows NT)
Firefox	getBoxObjectFor()	Mozilla/5.0 (Windows; U; Windows NT 5.2) Gecko/2008070208 Firefox/3.0.1 Mozilla/5.0 (Windows; U; Windows NT 5.1) Gecko/20070309 Firefox/2.0.0.3 Mozilla/5.0 (Windows; U; Windows NT 5.1) Gecko/20070803 Firefox/1.5.0.12
Opera	window.opera 属性	Opera/9.27 (Windows NT 5.2; U; zh-cn) Opera/8.0 (Macintosh; PPC Mac OS X; U; en) Mozilla/5.0 (Macintosh; PPC Mac OS X; U; en) Opera 8.0
Safari	openDatabase()	Mozilla/5.0 (Windows; U; Windows NT 5.2) AppleWebKit/525.13 (KHTML, like Gecko) Version/3.1 Safari/525.13 Mozilla/5.0 (iPhone; U; CPU like Mac OS X) AppleWebKit/420.1 (KHTML, like Gecko) Version/3.0 Mobile/4A93 Safari/419.3
chrome	MessageEvent()	Mozilla/5.0 (Windows; U; Windows NT 5.2) AppleWebKit/525.13 (KHTML, like Gecko) Chrome/0.2.149.27 Safari/525.13

• JavaScript代码

function userBrowser () {
                         var browserName = navigator .userAgent.toLowerCase();
                         var browserVer = (browserName.match( /.+(?:rv|it|ra|ie)[\/: ]([ \d .]+)/) || [0 , '0'])[ 1 ];
                         if (/msie/i .test(browserName) && !/opera/ .test(browserName)) {
                              alert( "IE:" + browserVer);
                               return ;
                        } else if (/firefox/i .test(browserName)) {
                              alert( "Firefox:" + browserVer);
                               return ;
                        } else if (/chrome/i .test(browserName) && /webkit/i .test(browserName) && /mozilla/i.test(browserName)) {
                              alert( "Chrome:" + browserVer);
                               return ;
                        } else if (/opera/i .test(browserName)) {
                              alert( "Opera:" + browserVer);
                               return ;
                        } else if (/webkit/i .test(browserName) && !( /chrome/i.test(browserName) && /webkit/i.test(browserName) && /mozilla/i .test(browserName))) {
                              alert( "Safari:" + browserVer);
                               return ;
                        } else {
                              alert( "unKnow" + browserVer);
                        }
                  }