JS擷取瀏覽器名稱及版本資訊函數

// 擷取瀏覽器名稱及版本資訊function appInfo(){    var browser = {            msie: false, firefox: false, opera: false, safari: false,             chrome: false, netscape: false, appname: 'unknown', version: 0        },        userAgent = window.navigator.userAgent.toLowerCase();    if ( /(msie|firefox|opera|chrome|netscape)\D+(\d[\d.]*)/.test( userAgent ) ){        browser[RegExp.$1] = true;        browser.appname = RegExp.$1;        browser.version = RegExp.$2;    } else if ( /version\D+(\d[\d.]*).*safari/.test( userAgent ) ){ // safari        browser.safari = true;        browser.appname = 'safari';        browser.version = RegExp.$2;    }    return browser;}// 調用樣本var myos = appInfo();// 如果當前瀏覽器是IE，彈出瀏覽器版本,否則彈出當前瀏覽器名稱和版本if ( myos.msie ){    alert( myos.version );} else {    alert( myos.appname + myos.version );}