第一种
<script type="text/javascript">
try {
var urlhash = window.location.hash;
if (!urlhash.match("fromapp"))
{
if ((navigator.userAgent.match(/(iPhone|iPod|Android|ios|iPad)/i)))
{
window.location='http://m.baidu.com';
}
}
}
catch(err)
{
}
</script>
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第二种
/*检测浏览器方法
------------------------------------------------*/
var pageurl = window.location.search;
if (pageurl == '?m2w') {
addCookie('m2wcookie', '1', 0);
}
if (getCookie('m2wcookie') != '1' && browserRedirect()) {
location.href = 'http://www.hacnn.com';
}
///*工具类方法
//------------------------------------------------*/
//检测是否移动设备来访
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) {
return true;
} else {
return false;
}
}
//写Cookie
function addCookie(objName, objValue, objHours) {
var str = objName + "=" + escape(objValue);
if (objHours > 0) {//为0时不设定过期时间，浏览器关闭时cookie自动消失
var date = new Date();
var ms = objHours * 3600 * 1000;
date.setTime(date.getTime() + ms);
str += "; expires=" + date.toGMTString();
}
document.cookie = str;
}
//读Cookie
function getCookie(objName) {//获取指定名称的cookie的值
var arrStr = document.cookie.split("; ");
for (var i = 0; i < arrStr.length; i++) {
var temp = arrStr[i].split("=");
if (temp[0] == objName) return unescape(temp[1]);
}
return "";
}
感觉cookie存值完全没有必要，不知道为什么原作者要这个写！
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延伸阅读：
JS读取UserAgent信息并做判断
userAgent信息可以由navigator.userAgent拿到。
例子：
<script type="text/javascript">
document.writeln("navigator.userAgent: " + navigator.userAgent + "<br />");
document.writeln("navigator.appName: " + navigator.appName + "<br />");
document.writeln("navigator.appCodeName: " + navigator.appCodeName + "<br />");
document.writeln("navigator.appVersion: " + navigator.appVersion + "<br />");
document.writeln("navigator.appMinorVersion: " + navigator.appMinorVersion + "<br />");
document.writeln("navigator.platform: " + navigator.platform + "<br />");
document.writeln("navigator.cookieEnabled: " + navigator.cookieEnabled + "<br />");
document.writeln("navigator.onLine: " + navigator.onLine + "<br />");
document.writeln("navigator.userLanguage: " + navigator.userLanguage + "<br />");
document.writeln("navigator.mimeTypes[1].description: " + navigator.mimeTypes[1].description + "<br />");
document.writeln("navigator.mimeTypes[1].type: " + navigator.mimeTypes[1].type + "<br />");
document.writeln("navigator.plugins[3].description: " + navigator.plugins[3].description + "<br />");
</script>
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如果想来判断其中内容，可以用
navigator.userAgent.match()或navigator.userAgent.indexOf()来判断
前者一般是用来判断手机客户端，例如navigator.userAgent.match(/iPhone/i) , navigator.userAgent.match(/Safari/i)
后者用来变向判断userAgent字符串中某值是否存在，例如 navigator.userAgent.indexOf("iPhone OS 4_0_2") !=-1\
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<script type="text/javascript">
var useHTML5 = 1;
if(navigator.userAgent.indexOf("iPhone OS 4_0_2") !=-1)
{
useHTML5=2;
}
document.write("Value is: <br>");
document.write(useHTML5);
</script>
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所以它经常会用来判断浏览器类型，如navigator.userAgent.indexOf("Firefox")>0
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番外
<script type="text/javascript">
if (window.location.toString().indexOf('pref=padindex') != -1) {} else {
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|Windows Phone|webOS|iPhone|iPod|BlackBerry/i.test(navigator.userAgent)) {
window.location.href = "/m/index.php";
} else if (/iPad/i.test(navigator.userAgent)) {} else {}
} catch(e) {}
}
}
}
</script>
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