如何在javascript中检测浏览器渲染引擎？ [英] How to detect browser rendering engine in javascript?
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问题描述
我读了一本名为'Professional Javascript For Web Developers 2nd edition'的书，它说明这段代码可以检测浏览器渲染引擎：
I read a book calls 'Professional Javascript For Web Developers 2nd edition' and it state that this code can detect browser rendering engine:
<script type="text/javascript">
var client = function(){
var engine = {
ie: 0,
gecko: 0,
webkit: 0,
khtml: 0,
opera: 0,
ver: null
};
return {
engine : engine
};
}();
if(client.engine.ie){
alert("This is internet explorer");
}else if(client.engine.gecko > 1.5){
if(client.engine.ver == "1.8.1"){
alert("This is gecko rendering browser");
}
}else if(client.engine.webkit){
alert("This is web kit");
}else if(client.engine.khtml){
alert("This is khtml");
}else{
alert("none of the above");
}
</script>
但似乎不起作用，那么这段代码如何检测浏览器渲染引擎呢？谢谢
but it seems like doesn't work, so how this code work to detect browser rendering engine?Thanks
推荐答案
然后你可以看看client.js：
then you can look at client.js:
它仍然适用于IE10 Win10上的win7和Chrome 67
It still works in IE10 on win7 and Chrome 67 on Win10
处理IE11（Trident /）和Edge（Edg）需要稍加改动e /） - 稍后见
It needs a little change to handle IE11 (Trident/) and Edge(Edge/) - see later
var client = function() {
//rendering engines
var engine = {
ie: 0,
gecko: 0,
webkit: 0,
khtml: 0,
opera: 0,
//complete version
ver: null
};
//browsers
var browser = {
//browsers
ie: 0,
firefox: 0,
safari: 0,
konq: 0,
opera: 0,
chrome: 0,
safari: 0,
//specific version
ver: null
};
//platform/device/OS
var system = {
win: false,
mac: false,
x11: false,
//mobile devices
iphone: false,
ipod: false,
nokiaN: false,
winMobile: false,
macMobile: false,
//game systems
wii: false,
ps: false
};
//detect rendering engines/browsers
var ua = navigator.userAgent;
if (window.opera) {
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);
//figure out if it's Chrome or 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 {
//approximate version
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);
//determine if it's Firefox
if (/Firefox\/(\S+)/.test(ua)) {
browser.ver = RegExp["$1"];
browser.firefox = parseFloat(browser.ver);
}
} else if (/MSIE ([^;]+)/.test(ua)) { // add Trident/ to test IE11, Edge for Edge
engine.ver = browser.ver = RegExp["$1"];
engine.ie = browser.ie = parseFloat(engine.ver);
}
//detect browsers
browser.ie = engine.ie;
browser.opera = engine.opera;
//detect platform
var p = navigator.platform;
system.win = p.indexOf("Win") == 0;
system.mac = p.indexOf("Mac") == 0;
system.x11 = (p == "X11") || (p.indexOf("Linux") == 0);
//detect windows operating systems
if (system.win) {
if (/Win(?:dows )?([^do]{2})\s?(\d+\.\d+)?/.test(ua)) {
if (RegExp["$1"] == "NT") {
switch (RegExp["$2"]) {
case "5.0":
system.win = "2000";
break;
case "5.1":
system.win = "XP";
break;
case "6.0":
system.win = "Vista";
break;
default:
system.win = "NT";
break;
}
} else if (RegExp["$1"] == "9x") {
system.win = "ME";
} else {
system.win = RegExp["$1"];
}
}
}
//mobile devices
system.iphone = ua.indexOf("iPhone") > -1;
system.ipod = ua.indexOf("iPod") > -1;
system.nokiaN = ua.indexOf("NokiaN") > -1;
system.winMobile = (system.win == "CE");
system.macMobile = (system.iphone || system.ipod);
//gaming systems
system.wii = ua.indexOf("Wii") > -1;
system.ps = /playstation/i.test(ua);
//return it
return {
engine: engine,
browser: browser,
system: system
};
}();
console.log(client.browser,client.engine,client.system)
需要稍微改动才能处理IE11（Trident /）和Edge（Edge /）
It needs a little change to handle IE11 (Trident/) and Edge(Edge/)
var client = function() {
//rendering engines
var engine = {
ie: 0,
edge: 0,
gecko: 0,
webkit: 0,
khtml: 0,
opera: 0,
//complete version
ver: null
};
//browsers
var browser = {
//browsers
ie: 0,
edge: 0,
firefox: 0,
safari: 0,
konq: 0,
opera: 0,
chrome: 0,
safari: 0,
//specific version
ver: null
};
//platform/device/OS
var system = {
win: false,
mac: false,
x11: false,
//mobile devices
iphone: false,
ipod: false,
nokiaN: false,
winMobile: false,
macMobile: false,
//game systems
wii: false,
ps: false
};
//detect rendering engines/browsers
var ua = navigator.userAgent;
if (window.opera) {
engine.ver = browser.ver = window.opera.version();
engine.opera = browser.opera = parseFloat(engine.ver);
}
else if (/Edge\/([^;]+)/.test(ua)) { // IE11
engine.ver = browser.ver = RegExp["$1"];
engine.edge = browser.edge = parseFloat(engine.ver);
} else if (/AppleWebKit\/(\S+)/.test(ua)) {
engine.ver = RegExp["$1"];
engine.webkit = parseFloat(engine.ver);
//figure out if it's Chrome or 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 {
//approximate version
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);
//determine if it's Firefox
if (/Firefox\/(\S+)/.test(ua)) {
browser.ver = RegExp["$1"];
browser.firefox = parseFloat(browser.ver);
}
} else if (/MSIE ([^;]+)/.test(ua)) { // IE <= 10
engine.ver = browser.ver = RegExp["$1"];
engine.ie = browser.ie = parseFloat(engine.ver);
} else if (/Trident\/([^;]+)/.test(ua)) { // IE11
engine.ver = RegExp["$1"];
browser.ver = parseFloat(ua.split("rv:")[1]);
engine.ie = parseFloat(browser.ver);
}
//detect browsers
browser.ie = engine.ie;
browser.opera = engine.opera;
//detect platform
var p = navigator.platform;
system.win = p.indexOf("Win") == 0;
system.mac = p.indexOf("Mac") == 0;
system.x11 = (p == "X11") || (p.indexOf("Linux") == 0);
//detect windows operating systems
if (system.win) {
if (/Win(?:dows )?([^do]{2})\s?(\d+\.\d+)?/.test(ua)) {
if (RegExp["$1"] == "NT") {
switch (RegExp["$2"]) {
case "5.0":
system.win = "2000";
break;
case "5.1":
system.win = "XP";
break;
case "6.0":
system.win = "Vista";
break;
default:
system.win = "NT";
break;
}
} else if (RegExp["$1"] == "9x") {
system.win = "ME";
} else {
system.win = RegExp["$1"];
}
}
}
//mobile devices
system.iphone = ua.indexOf("iPhone") > -1;
system.ipod = ua.indexOf("iPod") > -1;
system.nokiaN = ua.indexOf("NokiaN") > -1;
system.winMobile = (system.win == "CE");
system.macMobile = (system.iphone || system.ipod);
//gaming systems
system.wii = ua.indexOf("Wii") > -1;
system.ps = /playstation/i.test(ua);
//return it
return {
engine: engine,
browser: browser,
system: system
};
}();
console.log(JSON.stringify({ browser:client.browser,engine:client.engine,system:client.system},null, 2));
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