判断客户端版本

function detectBrowser(ns){
        var ua = ns.ua = navigator.userAgent;        
        ns.isWebKit = (/webkit/i).test(ua);
        ns.isMozilla = (/mozilla/i).test(ua);    
        ns.isIE = (/msie/i).test(ua);
        ns.isFirefox = (/firefox/i).test(ua);
        ns.isChrome = (/chrome/i).test(ua);
        ns.isSafari = (/safari/i).test(ua) && !this.isChrome;
        ns.isMobile = (/mobile/i).test(ua);
        ns.isOpera = (/opera/i).test(ua);
        ns.isIOS = (/ios/i).test(ua);
        ns.isIpad = (/ipad/i).test(ua);
        ns.isIpod = (/ipod/i).test(ua);
        ns.isIphone = (/iphone/i).test(ua) && !this.isIpod;
        ns.isAndroid = (/android/i).test(ua);
        ns.supportStorage = "localStorage" in window;
        ns.supportOrientation = "orientation" in window;
        ns.supportDeviceMotion = "ondevicemotion" in window;
        ns.supportTouch = "ontouchstart" in window;
        ns.cssPrefix = ns.isWebKit ? "webkit" : ns.isFirefox ? "Moz" : ns.isOpera ? "O" : ns.isIE ? "ms" : "";
    };
// 判断是否为移动端运行环境

// wukong.name 20130716

if(/AppleWebKit.*Mobile/i.test(navigator.userAgent) || (/MIDP|SymbianOS|NOKIA|SAMSUNG|LG|NEC|TCL|Alcatel|BIRD|DBTEL|Dopod|PHILIPS|HAIER|LENOVO|MOT-|Nokia|SonyEricsson|SIE-|Amoi|ZTE/.test(navigator.userAgent))){

if(window.location.href.indexOf("?mobile")<0){

try{

if(/Android|webOS|iPhone|iPod|BlackBerry/i.test(navigator.userAgent)){

// 判断访问环境是 Android|webOS|iPhone|iPod|BlackBerry 则加载以下样式

setActiveStyleSheet("style_mobile_a.css");

}

else if(/iPad/i.test(navigator.userAgent)){

// 判断访问环境是 iPad 则加载以下样式

setActiveStyleSheet("style_mobile_iPad.css");

}

else{

// 判断访问环境是 其他移动设备 则加载以下样式

setActiveStyleSheet("style_mobile_other.css");

}

}

catch(e){}

}

}

else{

// 如果以上都不是,则加载以下样式

setActiveStyleSheet("style_mobile_no.css");

}

// 判断完毕后加载样式

function setActiveStyleSheet(filename){document.write("<link href="+filename+" rel=stylesheet>");}
原文地址:https://www.cnblogs.com/qiangspecial/p/3436995.html