js中有一个对象叫 navigator，navigator 对象包含有关浏览器的信息。所有的浏览器都支持该对象。
其中经常用到的是 navigator.userAgent 属性，通常，它是在 navigator.appCodeName(浏览器的名称) 的值之后加上斜线和 navigator.appVersion 的值构成的。
判断是PC还是手机浏览器:
第一种：
function IsPC() {
var userAgentInfo = navigator.userAgent;
var Agents = ["Android", "iPhone","SymbianOS", "Windows Phone", "iPad", "iPod"];
var flag = true;
for (var v = 0; v < Agents.length; v++) {
if (userAgentInfo.indexOf(Agents[v]) > 0) {
flag = false;
break;
}
}
return flag;
}
第二种：
function browserRedirect() {
var sUserAgent = navigator.userAgent.toLowerCase();
var bIsIpad = sUserAgent.match(/ipad/i) == "ipad";
var bIsIphoneOs = sUserAgent.match(/iphone os/i) == "iphone os";
var bIsMidp = sUserAgent.match(/midp/i) == "midp";
var bIsUc7 = sUserAgent.match(/rv:1.2.3.4/i) == "rv:1.2.3.4";
var bIsUc = sUserAgent.match(/ucweb/i) == "ucweb";
var bIsAndroid = sUserAgent.match(/android/i) == "android";
var bIsCE = sUserAgent.match(/windows ce/i) == "windows ce";
var bIsWM = sUserAgent.match(/windows mobile/i) == "windows mobile";
if (!(bIsIpad || bIsIphoneOs || bIsMidp || bIsUc7 || bIsUc || bIsAndroid || bIsCE || bIsWM) ){
window.location.href=B页面;
}
}
判断是安卓还是iOS
常用：
function ismobile(test){
var u = navigator.userAgent, app = navigator.appVersion;
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(/iPhone|mac|iPod|iPad/i.test(navigator.userAgent)){
return ‘0‘;
}else{
return ‘1‘;
}
}catch(e){}
}
}else if( u.indexOf(‘iPad‘) > -1){
return ‘0‘;
}else{
return ‘1‘;
}
};