检测浏览器，注意浏览器判断顺序，主要是基于userAgent做判断。
//检测浏览器 var client = function(){ var engine = { ie:0, gecko:0, webkit:0, khtml:0, opera:0, ver:null }; var browser = { //浏览器 ie: 0, firefox: 0, safari: 0, konq: 0, opera: 0, chrome: 0, ver:null }; var ua = navigator.userAgent; //浏览器检测有顺序 if(window.opera){//opera伪装，所以优先检测 engine.ver = browser.ver = window.opera.version(); engine.opera = browser.opera = parseFloat(engine.ver); } else if(/AppleWebKit\/(\S+)/.test(ua)){ engine.ver = RegExp["$1"]; engine.webkit = parseFloat(engine.ver); //确定是 Chrome 还是 Safari if (/Chrome\/(\S+)/.test(ua)){ browser.ver = RegExp["$1"]; browser.chrome = parseFloat(browser.ver); } else if (/Version\/(\S+)/.test(ua)){ browser.ver = RegExp["$1"]; browser.safari = parseFloat(browser.ver); } else { //近似地确定版本号 var safariVersion = 1; if (engine.webkit < 100){ safariVersion = 1; } else if (engine.webkit < 312){ safariVersion = 1.2; } else if (engine.webkit < 412){ safariVersion = 1.3; } else { safariVersion = 2; } browser.safari = browser.ver = safariVersion; } }else if (/KHTML\/(\S+)/.test(ua) || /Konqueror\/([^;]+)/.test(ua)){ engine.ver = browser.ver = RegExp["$1"]; engine.khtml = browser.konq = parseFloat(engine.ver); }else if (/rv:([^\)]+)\) Gecko\/\d{8}/.test(ua)){ engine.ver = RegExp["$1"]; engine.gecko = parseFloat(engine.ver); //确定是不是 Firefox if (/Firefox\/(\S+)/.test(ua)){ browser.ver = RegExp["$1"]; browser.firefox = parseFloat(browser.ver); } }else if (/MSIE ([^;]+)/.test(ua)){ engine.ver = browser.ver = RegExp["$1"]; engine.ie = browser.ie = parseFloat(engine.ver); } return { engine:engine, browser: browser }; }(); //调用 if (client.engine.webkit) { //if it's WebKit if (client.browser.chrome){ //执行针对 Chrome 的代码 } else if (client.browser.safari){ //执行针对 Safari 的代码 } } else if (client.engine.gecko){ if (client.browser.firefox){ //执行针对 Firefox 的代码 } else { //执行针对其他 Gecko 浏览器的代码 } }
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