JavaScript:用户代理检测源代码

原生JavaScript用户代理检测

代码直接po上，方便有需要者使用

var client = function(){
    // 用户代理引擎
    var engine = {
        ie : 0,
        gecko : 0,
        webkit : 0,
        khtml : 0,
        opera : 0,

        ver : null
    };
    //用户浏览器类型
    var browser = {
        ie : 0,
        firefox : 0,
        safari : 0,
        konq : 0,
        opera : 0,
        chrome : 0,

        ver : null
    }

    //用户平台、设备、操作系统
    var system = {
        win : false,
        mac : false,
        xll : false,

        iphone : false,
        ipod : false,
        ipad : false,
        ios : false,
        android : false,
        nokiaN : false,
        winMobile : false,
        
        wii : false,
        ps : false,

    };

    /*
        按顺序检测：opera,webkit,khtml,gecko,ie
    */
    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)){    //S+表示非空格的特殊字符
        engine.ver = RegExp["$1"];  //捕获正则表达式匹配的第一个字符串
        engine.webkit = parseFloat(engine.ver);

        //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{
            //近似确定版本
            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;
            }
        }
    }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);
        //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);
    };

    //检测平台
    var plaform = navigator.plaform;
    system.win = plaform.indexOf("Win") == 0;
    system.mac = plaform.indexOf("Mac") == 0;
    system.xll = (plaform.indexOf("Xll") == 0) || (plaform.indexOf("Linux") == 0);

    //检测Windows操作系统
    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;
                    }
                    case "6.1":{
                        system.win = "7";
                        break;
                    }
                    default:{
                        system.win = "NT";
                        break;
                    }
                }
            }else if(RegExp["$1"] == "9x"){
                system.win = "ME";
            }else{
                system.win = RegExp["$1"];
            }
        }

    }

    //移动设备
    system.iphone = ua.indexOf("iPhone") > -1;
    system.ipod = ua.indexOf("iPod") > -1;
    system.ipad = ua.indexOf("iPad") > -1;
    system.NokiaN = ua.indexOf("NokiaN") > -1;

    //windowsMobile
    if(system.win == "CE"){
        system.winMobile = system.win;
    }else if(system.win == "Ph"){
        if(/Windows Phone OS (\d+.\d+)/.test(ua)){
            system.win = "Phone";
            system.winMobile = parseFloat(RegExp["$1"]);
        }
    }

    //检测ios版本
    if(system.mac && ua.indexOf("Mobile") > -1){
        if(/CPU (?:iPhone )?OS (\d+_\d+)/.test(ua)){
            system.ios = parseFloat(RegExp.$1.replace("_","."));
        }else{
            system.ios = 2;
        }
    }

    //检测安卓版本
    if(/Android (\d+\.+\d)/.test(ua)){
        system.android = parseFloat(RegExp.$1);
    }

    //游戏系统
    system.wii = ua.indexOf("Wii") > -1;
    system.ps = /playstation/i.test(ua);


    return {
        engine : engine,
        browser : browser,
        system : system
    };
}(); 

以上源码来自《JavaScript高级程序设计（第三版）》

本文地址：https://blog.csdn.net/yivisir/article/details/107424251