如何在JavaScript中检测浏览器渲染引擎？
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我读了一本书，名为《面向Web开发人员的专业Javascript第二版》，书中指出该代码可以检测浏览器渲染引擎：
<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>
没有找到相关结果
已邀请:
3 个回复
久坡
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)膝垫富顷
抬澈帅沮
if(screen.width > 360 && screen.width < 720){ document.write (\'<meta name=\"viewport\" content=\"initial-scale=.25, maximum-scale=.25, user-scalable=no\">\'); }